HomeMy WebLinkAboutordinance.council.003-96
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ORDINANCE NO. "3
Series of 1996
AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF ASPEN,
COLORADO, ADOPTING ADDITIONS TO THE BUILDING REGULATIONS
OF THE MUNICIPAL CODE OF THE CITY OF ASPEN, COLORADO, TO BE
KNOWN AS THE ASPEN/PITKIN ENERGY CONSERVATION CODE.
WHEREAS, Aspen adopted the 1986 Model Energy Code in 1991; and
WHEREAS, The Model Energy Code does not regulate outdoor heating systems, such as
snowmelt and outdoor pools and spas; and
WHEREAS, The Aspen/Pitkin Energy Conservation Code was developed with
review and feedback from the Energy 2000 Committee, the Community Office of
Resource Efficiency, the Rocky Mountain Institute, and loca1ntility companies; and
WHEREAS, The Aspen/Pitkin Energy Conservation Code establishes standards for
pools, spas, and snowmelt systems; and
WHEREAS, It is the policy of the City to encourage features in any development which
will conserve energy resources and minimize the consumption of energy.
NOW, THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY
OF ASPEN, COLORADO:
Section 1. That Section 7-140 of the Municipal Code of the City of Aspen, Colorado, is
hereby repealed and re-enacted to read as follows:
Pursuant to the powers and authority conferred by the laws of the State of Colorado and
the Charter of the City of Aspen, Colorado there is hereby adopted as the building code
for the City of Aspen, Colorado, there is hereby adopted and incorporated herein by
reference as if fully set forth those regulations contained in the Uniform Building Code,
1994 Edition, inclnding Appendix Chapters 4,13,15,16,30,31,33, and the Uniform
Building Code Standards, 1994 Edition published by the International Conference of
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Building Officials, 5360 South Workman Mill Road, Whittier, California 90601 except as
otherwise provided by amendment or deletion as contained in Section 7-141 of Article V
of this chapter. At least one (I) copy of the Uniform Building Code and Uniform
Building Code Standards shall be available for inspection during regular business hours.
Section 2. UBC Appendix Chapter 13 Section 1302.2 is amended to read as follows:
business
1302.2 Aspen/Pitkin Energy Conservation Code adopted.
Buildings shall be designed and built to comply with the requirements
of the Aspen/Pitkin Energy Conservation Code, attached and incorporated
by this reference. At least one (I) copy of the Aspen/Pitkin Energy
Conservation Code shall be available for inspection during regular
hours.
Section 3. That if any section, subsection, sentence, clause, phrase or portion of this
ordinance is for any reason held invalid or unconstitutional in a court of competent
jurisdiction, such portion shall be deemed a separate, distinct and independent provision
and shall not affect the validity of the remaining portions thereof.
Section 4. That this ordinance shall not have any effect on existing litigation and shall
not operate as an abatement of any action or proceeding now pending under or by virtue
of the ordinances amended as herein provided, and the same shall be construed and
concluded under such prior ordinances.
A public hearing on the ordinance shall be held on the /~ day of~i996, in the
City Council Chambers, Aspen City Hall, Aspen, Colorado.
INTRODUCED, READ AND ORDERED PU~72~~,~~ovided by law by the City
Council of the City of Aspen on the.,;;ly.!day ~lU,6.
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John S. Bennett, Mayor
ATTEST:
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Kathryn S. I
^. FINALLY ,dop''''. p,eood ,ru1 'ppro=! "" ,2C;;Z d'Y of ~7996.
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John S. Bennett, Mayor
ATTEST:
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Kathryn S. Ko ,City Clerk
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ASPENIPITKIN.
de ENERGY
CONSERV A TI4JN
CODE
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TABLE OF CONTENTS
CITY OF ASPEN/PITKIN COUNTY
ENERGY CONSERVATION CODE
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EFFECTIVE USE OF THE CODE.................................................................................i
CHAPTER 1 - ADMINISTRATION
SECTION 101 - TITLE, PURPOSE, AND SCOPE.................................................l-l
SECTION 102 - RESERVED.....................................................................................1-1
SECTION 103 - VIOLA TIONS.................................................................................1-1
SECTION 104 - ORGANIZATION AND ENFORCEMENT.................................1-2
SECTION 105 - BOARD OF APPEALS...................................................................1-2
SECTION 106 - PERMITS.........................................................................................1-2
SECTION 107 - FEES.................................................................................................1-3
SECTION 108 - INSPECTIONS................................................................................1-3
SECTION 109 - CERTIFICATES OF OCCUPANCY............................................1-3
SECTION 110 - CALCULATION METHODS AND ALTERNATE
COMPONENT P ACKAGES..........................................................1-3
SECTION 111 - CERTIFICATION OF ENERGY PROFESSIONALS................1-3
CHAPTER 2 - DEFINITIONS AND ABBREVIATIONS
CHAPTER 3 - ENERGY CONSERVATION STANDARDS
SECTION 301- ALL OCCUPANCIES -- GENERAL PROVISIONS...................3-1
SECTION 302 - CALCULATION OF SOURCE ENERGY CONSUMPTION....3-2
SECTION 303 - MANDATORY REQUIREMENTS FOR SERVICE
SNOWMELT SYSTEMS AND EQUIPMENT
SECTION 304 - MANDATORY REQUIREMENTS FOR SOLID FUEL
BURNING DEVICES......................................................................3-3
SECTION 305 - RESIDENTIAL MANDATORY FEATURES AND DEVICES.3-3
SECTION 306 - RESIDENTIAL PRESCRIPTIVE COMPLIANCE...................3-11
SECTION 307 - RESIDENTIAL PERFORMANCE COMPLIANCE.................3-12
SECTION 308 - RESIDENTIAL -- ADDITIONS...................................................3-16
SECTION 309 - RESIDJ8NTIAL -- ALTERATIONS............................................3-16
SECTION 310 - NONRESIDENTIAL COMPLIANCE.........................................3-16
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ASPEN/PITKIN ENERGY CONSERV A nON CODE
COMPLIANCE PROCESS
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Meet the Mandatory
Requirements
Snowmelt, Pools I YES
or Spas
(Performance)
NO
Colorado Green
Program
Compliance
Snowmelt, Pool or Spa
MEC Check Engineering
Calculations
Alternative
Prescriptive Calculation Computer
Packages Method Method I Calres AlP .1
1 REDESIGN I I REDESIGN I
Submit Plans and
Forms to Building
Department
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CONSTRUCT
BUILDING
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STEP I:
STEP 2:
STEP 3:
STEP 4:
STEP 5:
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STEP 6:
STEP 7:
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EFFECTIVE USE OF THE
CITY OF ASPEN/PITKIN COUNTY
ENERGY CONSERVATION CODE
Determine if your project must comply with the APECC (See Section
101).
Meet the general and mandatory requirements (See Sections 301, 303, 304,
and 305).
If you have snowmelt, private pool, or private spa heating systems and
equipment as part of your project, you must demonstrate compliance using
the performance method (See Section 307).
If your project has been certified to meet the requirements of the Colorado
Green Program, it is exempt from the prescriptive and performance
requirements of this code. Submit your plans and your Colorado Green
Certificate, application and booklet with your building permit application.
Use one of the compliance approaches. Select one of the four compliance
approaches described in Sections 306 through 310. The path of least
resistance leads to the prescriptive compliance packages (See Chapter 3
MEC check). Use the selected approach to determine the energy
conservation requirements. Document compliance on the forms provided
for the selected approach.
Submit building plans and compliance forms for plan review (See Section
106). The compliance forms must match the building plans and
specifications. Changes in any characteristic of any feature, material,
component, or manufactured device will require re-submittal.
Construct the building according to approved plans. Approved plans and
specifications shall be kept on the site at all times during which the work
authorized thereby is in progress (See Section 106.4.2, UBC). Compliance
forms, plans, and specifications must be re-submitted if changes from the
approved plans or specifications are made during construction.
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CHAPTER 1
ADMINISTRATION
SECTION 101 - TITLE, PURPOSE, AND SCOPE
101.1 Title. These regulations shall be known as the Aspen/Pitkin Energy Conservation
Code, may be cited as such and will be referred to herein as "this Code".
101.2 Purpose. The pnrpose of this code is to provide minimum standards for the
conservation of energy obtained from depleteable sonrces by regulating and controlling
the design, constmction, quality of materials, location and maintenance of all buildings
and stmctnres within this jnrisdiction and certain equipment specifically regulated herein.
101.3 Scope. The provisions of this code shall apply to all buildings for which an
application for a building permit or renewal of an existing permit is filed or is required by
law to be filed; and, that are either directly or indirectly conditioned by mechanical
heating or mechanical cooling.
EXCEPTION: Qualified historic buildings, as defined in Pitkin County Code 5-
465 and City of Aspen Code 24-7-709.
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101.3.1 The provisions of this code shall apply to all snowmelt, swimming pool, and spa
heating system equipment for which an application for a permit or renewal of an existing
permit is filed or is by law required to be filed.
Where in any specific case, different sections of this code specify different materials,
methods of construction or other requirements, the most restrictive shall govern. Where
there is a conflict between a general requirement and a specific requirement, the specific
requirement shall be applicable.
SECTION 102 - (RESERVED)
SECTION 103 - VIOLATIONS AND PENALTIES
103.1 Violations. It shall be unlawful for any person, including an owner, occupant or
builder, to erect, construct, enlarge, alter, repair, move, improve, remove, conveli or
demolish, equip, use, occupy or maintain any building or structure or cause the same to be
done, contrary to or in violation of any provisions of this code.
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103.2 Penalties. A violation of any of the provisions of this code shall constitute a
misdemeanor, punishable upon conviction by a fine not exceeding three hundred dollars
($300.00), or by imprisonment not exceeding ninety (90) days, or both such fine and
imprisonment. A separate offense shall be deemed committed on each day or portion
thereof that the violation of any of the provisions of this code occurs or continues
unabated after the time the limit set for abatement of the violation
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SECTION 104. ORGANIZATION AND ENFORCEMENT
See Section 104 of the 1994 UBC.
SECTION 105 . BOARD OF APPEALS
See Section 105 of the 1994 UBC.
SECTION 106 . PERMITS
See Section 106 of the 1994 UBC.
106.1 Additional information for APECC Permits. Each application for a building
permit subject to this code shall contain at least two copies of the documents listed below.
For all new buildings and outdoor heating system equipment regulated by this code the
applicant shall file the appropriate Certificates of Compliance with the plans. The
Certificates shall indicate the features and performance specifications needed to comply
with this code, and shall be approved by the Building Division by stamp and authorized
signature. The individual with overall responsibility for the design shall sign the
Certificates of Compliance.
Plans and specifications showing the characteristics of each feature, material, component,
and manufactured device regulated by Chapter 3. If any characteristic of any such
feature, material, component, or manufactured device is changed before the final
inspection, the change shall be submitted to the Building Division.
106.2 Responsibility for Signing. Each document described in Section 106.1 shall be
signed by the responsible person (RP) for its preparation. The signer shall be a Civil
Engineer, Mechanical Engineer, Electrical Engineer, Architect licensed by the State of
Colorado, or a general building contractor, mechanical contractor, or electrical contractor
licensed or registered to practice by the City of Aspen! Pitkin County or an owner builder.
If more than one person has responsibility for building design or constmction, each
person may prepare and sign the document or documents applicable to that portion of the
design or construction for which the person was responsible; alternatively, the person
with chief responsibility for design or constmction may prepare and sign the document
for the entire design or construction.
106.3 Issuance of APECC permits. No permits shall be issued for any constmction
unless the Building Division determines in writing that the constmction is designed to
comply with the requirements of this code in effect on the date on which the permit
application was submitted.
If a building permit has expired and there has been no constmction, the Building Division
shall not issne a new permit unless the Building Division determines in writing that the
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construction is designed to comply with the requirements of this code in effect on the date
the new permit is applied for.
SECTION 107 - FEES
The APECC review and compliance fee shall be 10% of the associated permit fee. The
minimum fee shall be $20.00.
SECTION 108 - INSPECTIONS
See Section 108 of the 1994 UBC
108.1 Energy Conservation Code inspections. The Building Division shall inspect new
construction to determine whether it is consistent with approved plans and specifications,
and complies with this code. Certificates of Occupancy shall not be issued until such
consistency is verified.
SECTION 109 - CERTIFICATES OF OCCUPANCY
See Section 109 of the 1994 UBC
SECTION 110 - CALCULATION METHODS AND ALTERNATE COMPONENT
PACKAGES
110.1 Pnblic Domain Computer Program. In addition to the present approved public
domain computer programs, the Chief Building Official may, upon written application or
his own motion, approve additional public domain computer programs that may be used
to demonstrate that the proposed building designs meet the requirements of this code.
The Chief Building Official shall ensure that user's manuals or guides for each approved
program are available.
SECTION 111 - CERTIFICATION OF ENERGY PROFESSIONALS
111.1 Certification. Certification for designers, licensed contractors and superintendents
will be available through seminars and testing approved by the Chief Building Official.
111.1.1 The design professional seminar and test will deal with designing for compliance
and documenting compliance. Once the design professional has completed the seminar
passed the test they will be Certified Energy Design Professionals by the Chief Building
Official.
Certified Energy Design Professionals will be entitled to submit Certified Documentation
of Compliance with a building permit application. Certification will exempt that
application from detailed review except for random audits.
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Certification will be revoked if the design professional shows disregard of the regulations
or if they certify documents that do not comply.
111.1.2 The licensed contractor or superintendent seminar and test will deal with
building stmctures to maintain compliance. Once the licensed contractor or
superintendent has completed the seminar and passed the test they will be Certified
Energy Building Professionals by the Chief Building Official.
Certified Energy Building Professionals will be entitled to certify compliance for
stmctures they build. Celtification will exempt those stmctures from detailed inspections
for energy code compliance except for random audits.
Certification will be revoked if the Celtified Energy Building Professionals show
disregard of the regulations or if they certify structures that do not comply.
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CHAPTER 2
DEFINITIONS AND ABBREVIATIONS
SECTION 201 - DEFINITIONS
201 General. For the purpose of this code certain tenns, phrases, words, and their
derivatives shall be constmed as specified in this chapter and elsewhere in this code where
specific definitions m'e provided. Terms, phrases, and words used in the singular include
the plural and the plural the singular. Terms, words, and phrases used in the masculine
gender include the feminine and the feminine the masculine.
Terms, phrases, and words not found in Chapter 2 shall be defined as specified in Chapter 7
of the Aspen Municipal Code or Title 7 of the Pitkin County Code. Terms, phrases, and
words not found in either Chapter 2 of this code or Chapter 7 of the Aspen Municipal Code
or Title 7 of the Pitkin County Code shall be defined in Chapter 2 of the 1994 UBC. Where
terms, phrases, and words are not defined in any of the references above, they shall be
defined as specified in Webster's Third New mtemational Dictionary of the English
Language, Unabridged (1986 ed.), unless context requires otherwise.
SECTION 202 - A
ACCESSffiLE is having access thereto, but which first may require removal or opening of
access panels, doors, or similar obstmctions.
ADDITION is any change to a bnilding that increases conditioned floor area and
conditioned volume.
AL TERA TION is any change to a building's water heating system, space conditioning
system, or envelope that is not an addition.
ALTERNATIVE CALCULATION METHODS (ACMs) me the City of Aspen/Pitkin
County Energy Code Public Domain Computer Programs, one of the City of Aspen/Pitkin
County Energy Code Simplified Calculation Methods, or any other calculation method
approved by the Chief Building Official.
APCDD is the Aspen/Pitkin Community Development Department.
APPLIANCE EFFICIENCY REGULATIONS is NAECA.
APPROVED BY THE CHIEF BUILDING OFFICIAL means approval under Uniform
Building Code.
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APPROVED CALCULATION METHOD (See ALTERNATIVE CALCULATION
METHODS).
SECTION 203 . B
BUILDING is any structure or space for which a permit is sought.
BUILDING DNISION means AspenlPitkin Community Development Department,
Building Division
BUILDING ENVELOPE is the ensemble of exterior and demising partitions of a building
that enclose conditioned space.
SECTION 204 . C
CERTIFYING ORGANIZATION is an independent organization recognized by the Chief
Building Official to celtify manufactured devices for performance values in accordance
with procedures adopted by the Chief Building Official.
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CHIEF BUILDING OFFICIAL is the officer or other designated authority charged with the
administration and enforcement of this code, or the Building Official's duly authorized
representative.
CLIMATE ZONE is the geographic areas of Pitkin County for which the AspenlPitkin
Regional Building Division has jurisdiction.
COLORADO GREEN PROGRAM is a guide to the green constmction of homes and
subdivisions, compiled by the Governors Office of Energy Conservation.
COMPLIANCE APPROACH means anyone of the allowable methods by which design
and constmction of a building may be demonstrated to be in compliance with Chapter 3.
CONDITIONED FLOOR AREA (CFA) is the floor area (in square feet) of enclosed
conditioned space on all floors of a building, as measured at the floor level of the extelior
surfaces of exterior walls enclosing the conditioned space.
CONDITIONED SPACE is space in a building that is either directly conditioned or
indirectly conditioned.
CONDITIONED VOLUME is the total volume (in cubic feet) of the conditioned space
within a building.
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COVERED PRODUCT is an appliance regulated by the efficiency standards established
under the National Appliance Energy Conservation Act (NAECA) ,42 US.c. Section 6291
of 1987.
CRAWL SPACE is a space immediately under the first floor of a building adjacent to
grade.
SECTION 205 - D
DECORATIVE GAS APPLIANCE is a gas appliance that is designed or installed for visual
effect only, cannot bum solid wood, and simulates a fire in a fireplace.
DEGREE DAY, HEATING is a unit, based upon temperature difference and time, used in
estimating fuel consumption and specifying nominal annual heating load of a building. For
anyone day, when the mean temperature is less than 650F, there exist as many degree days
as there are Fahrenheit degrees difference in temperature between the mean temperature for
the day and 650F. The number of degree days for use with this code is 8,850.
DEMISING PARTITIONS AND WALLS are balTiers that separate conditioned space from
enclosed unconditioned space.
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DESIGN CONDITIONS are the parameters and conditions used to determine the
pelformance requirements of space conditioning systems. Design conditions for
determining design heating and cooling loads are specified in Section 305.1.7.2.
DESIGN HEAT LOSS RATE is the total calculated heat loss through the building envelope
under design conditions.
SECTION 206 - E
ENCLOSED SPACE is space that is substantially sUlTounded by solid surfaces.
ENERGY BUDGET is the maximum amount of source energy that a proposed building, or
portion of a building, can be designed to consume, calculated with the approved procedures
specified in Chapter 3.
ENERGY CONSERVATION STANDARDS means City of AspenlPitkin County Energy
Conservation Code, Chapter 3.
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ENERGY OBTAINED FROM DEPLETABLE SOURCES is electricity purchased from a
public utility, or any energy obtained from coal, oil, natural gas, or liquefied petroleum
gases.
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ENERGY OBTAINED FROM NONDEPLET ABLE SOURCES is energy that is not
energy obtained from depletable sources.
ENFORCING AGENCY is the Aspen/Pitkin County Community Development
Department, Building Division.
ENTIRE BUILDING is the ensemble of all enclosed space in a building, including the
space for which a permit is sought, plus all existing conditioned and unconditioned space
within the structure.
ENVELOPE means building envelope.
EXFILTRATION is uncontrolled outward air leakage from inside a building, including
leakage through cracks and interstices, around windows and doors, and through any other
exterior partition or duct penetration.
EXPOSED THERMAL MASS is mass that is directly exposed (uncovered) to the
conditioned space of the building.
EXTERIOR FLOOR/SOFFIT is a horizontal exterior partition, or a horizontal demising
partition, under conditioned space. For residential occupancies, exterior floors also include
those on grade.
EXTERIOR PARTITION is an opaqne, translucent, or transparent solid barrier that
separates conditioned space from ambient air or space that is not enclosed. For low-rise
residential occupancies, exterior partitions also include barriers that separate conditioned
space from unconditioned space, or the ground.
EXTERIOR ROOF/CEILING is an exterior partition, or a demising partition, that has a
slope less than 60 degrees from horizontal, that has conditioned space below, and that is not
an exterior door or skylight.
EXTERIOR ROOF/CEILING AREA is the area of the exterior surface of exterior
roof/ceilings.
EXTERIOR WALL is any wall or element of a wall, or any member or group of members,
which defines the exterior boundaries or courts of a building and which has a slope of 60
degrees or greater with the horizontal plane. An exterior wall or partition is not an exterior
floor/soffit, exterior door, exterior roof/ceiling, window, skylight, or demising wall.
EXTERIOR WALL AREA is the area of the opaque exterior surface of exterior walls.
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SECTION 207 - F
FENESTRATION PRODUCT is any transparent or translucent material plus any sash,
frame, mullions, and dividers, in the envelope of a building, including, but not limited to:
windows, sliding glass doors, french doors, skylights, cmtain walls, and garden windows.
FIREPLACE is a hearth and fire chamber or similar prepared place in which a solid fuel Jire
may be burned, as defined in UBC Section 3102.2 and as further clarified in UBC Section
3102.7; these include but are not limited to factory-built fireplaces, masonry fireplaces, and
masonry heaters (solid fuel burning device).
SECTION 208 - G
GAS HEATING SYSTEM is a natural gas or liquefied petroleum gas heating system.
GAS LOG is a self-contained, free-standing, open-flame, gas-burning appliance consisting
of a metal frame or base supporting simulated logs, and designed for installation only in a
vented masonry fireplace.
GLAZING (See FENESTRATION PRODUCT).
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GROSS EXTERIOR ROOF AREA is the sum of the skylight area and the exterior
roof/ceiling area.
GROSS EXTERIOR WALL AREA is the sum of the window area, door area, and exterior
wall area.
SECTION 209 - H
HABITABLE STORY is a story that contains space in which humans may work or live in
reasonable comfort, and that has at least 50 percent of its volume above grade.
SECTION 210 - I
INDIRECTLY CONDITIONED SPACE is enclosed space that is not directly conditioned.
INFILTRATION is uncontrolled inward air leakage from outside a building, or
unconditioned space, including leakage through cracks and interstices, around windows and
doors, and through any other exterior or demising pmtition or pipe or duct penetration.
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SECTION 213 - L
LPG is Liquefied Petroleum Gas.
SECTION 214 - M
MANUFACTURED DEVICE is any heating, cooling, ventilation, water heating,
refrigeration, cooking, plumbing fitting, insulation, door, fenestration product, or any other
appliance, device, equipment, or system subject to this code.
MEC CHECK is Version 2.0 of a prescriptive compliance method that was developed by
Pacific Northwest Laboratory (Battelle Memorial Institute) for use with the 1993 MEC.
MECHANICAL HEATING is raising the temperature within a space for the purpose of
maintaining human comfort using electric resistance heaters, fossil fuel burners, heat
pumps, or other systems that require energy from depletable sources.
MODELING ASSUMPTIONS are the conditions (such as weather conditions, thermostat
settings and schedules, internal gain schedules, etc.) that are used for calculating a bnilding's
annual energy consumption and that are in the Alternative Calculation Methods Manuals.
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MODEL ENERGY CODE is the 1993 Model Energy Code prepared by the Council of
American Building Officials.
SECTION 215 - N
NAECA is the National Appliance Energy Conservation Act of 1987 (Public Law 100-12).
NONRESIDENTIAL BUILDING is any building that is not a residential building.
SECTION 216 - 0
OPERABLE SHADING DEVICE is a device at the interior or exterior of a building or
integral with a fenestration product, which is capable of being operated, either manually or
automatically, to adjust the amount of solar radiation admitted to the interior of the building.
OPTIMAL OVERHANG is an overhang that completely shades the glazing at solar noon
on August 21 and substantially exposes the glass at solar noon on December 21.
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SECTION 217 - P
SECTION 219 - R
RP is the responsible person.
RAISED FLOOR is a floor (partition) over a crawl space, or an unconditioned space, or
ambient air.
READILY ACCESSIDLE is capable of being reached quickly for operation, repair, or
inspection, without requiring climbing or removing obstacles, or resorting to access
equipment.
RELATIVE SOLAR HEAT GAIN is the ratio of solar heat gain through a fenestration
product (corrected for external shading) to the solar heat gain from an unshaded single light
of 1/8 inch thick clear double strength glass under the same set of conditions, excluding the
effects of mullions, frames and sashes.
REPAIR is the reconstmction or renewal of any pmt of ml existing building for the purpose
of its maintenance. Note: Repairs are not within the scope of this code.
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RESIDENTIAL BUILDING is a building that is of occupancy group R-1,R-2, R-3, or S3 or
U1 (associated with a group R).
RESPONSIDLE PERSON (RP) (See Section 106.3.6 Responsibility for Signing).
SECTION 220 - S
SERVICE WATER HEATING is heating of water for sanitary purposes for human
occupancy, other than for comfort heating.
SHADING COEFFICIENT (SC) is the ratio of the solar heat gain through a fenestration
product to the solar heat gain through an unshaded 1/8 inch thick clem' double strength glass
under the same set of conditions. For nonresidential, high-rise residential, and hotel/motel
buildings, this shall exclude the effects of mullions, frames, sashes, and interior and exterior
shading devices.
SITE SOLAR ENERGY is natural daylighting, or thermal, chemical, or electrical energy
derived from direct conversion of incident solar radiation at the building site.
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SKYLIGHT is glazing having a slope less than 60 degrees from the horizontal with
conditioned space below.
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SKYLIGHT AREA is the area of the surface of a skylight, plus the area of the frame, sash,
and mullions.
SNOWMELT is the mechanical melting of snow on driveways, walkways, etc.
SOLID FUEL BURNING DEVICE shall mean a buming device designed for solid fuel
combustion so that usable heat is derived for the interior of a building, and includes, without
limitation, solid fuel-fired stoves, wood stoves or any nature, fireplaces, pellet stoves, solid
fuel-fired cooking stoves, combination fuel furnaces or boilers which burn solid fuel, or any
other device used for the burning of solid combustible material. Solid fuel burning devices
do not include gas log fireplaces, decorative gas appliances or electJical appliances.
SOURCE ENERGY is the energy that is used at a site and consumed in producing and in
delivering energy to a site, including, but not limited to, power generation, transmission,
and distribution losses, and that is used to perform a specific function, such as space
conditioning, lighting or water heating. Table 3-1 contains the conversion factors for
converting site to source energy.
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SPA is a unit primarily designed for therapeutic use which is not drained, cleaned or refilled
for each individual. It may include, but not limited to, hydrojet circulation, hot water, cold
water, mineral baths, air induction bubbles, or any combination thereof. IndustJy
terminology for spa includes, but is not limited to, therapeutic pool, hydrotherapy pool,
whirlpool, hot spa, etc.
SPA POOL is a pool, not under medical supervision that incorporates water jets and/or an
aeration system used for hydro massage.
SPACE CONDITIONING SYSTEM is a system that provides either collectively or
individually heating, ventilating, or cooling within or associated with conditioned spaces in
a building.
SWIMMING POOL is any constructed or prefabricated pool used for swimming or bathing,
twenty-four (24) inches or more in depth.
SWIMMING POOL-PRIVATE is all constructed pools which are used as a swimming pool
in connection with a single family residence, and available only to family of the householder
and his private guests.
SWIMMING POOL-PUBLIC is any constructed pool other than a private swimming pool.
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SYSTEM is a combination of equipment, controls, accessories, interconnecting means, or
terminal elements, by which energy is transformed to perform a specific fnnction, such as
space conditioning, or service water heating.
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SECTION 221 - T
THERMAL MASS is solid or liquid material used to store heat for later heating use or for
reducing cooling requirements.
THERMAL RESISTANCE (R) is the resistance of a material or building component to the
passage of heat in (hr x ft2 x OF)/Btu.
SECTION 222 - U
UBC is the 1994 edition of the Uniform Building Code.
UMC is the 1994 edition of the Uniform Mechanical Code.
UNCONDITIONED SPACE is enclosed space within a building that is not conditioned
space.
U-VALUE is the overall coefficient of thermal transmittance of a construction assembly, in
Btu/(hr x ft2 x OF), including air film resistance at both surfaces.
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VAPOR BARRIER is a material that has a permeance of one perm or less and that provides
resistance to the transmission of water vapor.
SECTION 223 - V
SECTION 224 - W
WINDOW is glazing that is not a skylight.
WINDOW AREA is the area of the surface of a window, plus the area of the frame, sash,
and mullions.
WINDOW WALL RA no is the ratio of the window area to the gross exterior wall area.
WOOD HEATER is an enclosed wood burning appliance used for space heating and/or
domestic water heating, and which meets the requirements of the AspenlPitkin
Environmental Health Department.
WOOD STOVE (See WOOD HEATER).
SECTION 227 - Z
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February 20, 1996
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ZONE, SPACE CONDITIONING is a space or group of spaces within a building with
sufficiently similar comfort conditioning requirements so that comfort conditions can be
maintained throughout the zone by a single controlling device.
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CHAPTER 3
ENERGY CONSERVATION STANDARDS
SECTION 301 . ALL OCCUPANCIES. GENERAL PROVISIONS
301.1 Buildings covered. The provisions of Chapter 3 apply to all buildings (see Section
101.3) and to all snowmelt, private swimming pool and spa heating system equipment (see
Section 101.3.1).
301.2 Parts of Buildings Covered. The provisions of Chapter 3 apply to the building
envelope, space conditioning systems, water heating systems, snowmelt systems, and
private pool and spa heating systems of buildings covered by this code.
301.3 Floors and Habitable Stories.
1. Only habitable floors that have at least 50 percent of their volume above grade as
defined in the UBC shall be counted in determining how many habitable stories a
building has.
2. All conditioned space in a floor shall comply with this code, whether or not the floor
is above grade and whether or not it is habitable.
301.4 Mixed Occupancy When a building is designed and constructed for more than one
type of occupancy, the space for each occupancy shall meet the provisions of this code
applicable to that occupancy.
EXCEPTION: If one occupancy constitutes at least 90 percent of the conditioned
floor area of the building, the entire building may comply with the provisions of this
code applicable to that occupancy.
301.5 Certification Requirements for Manufactured Devices. This code limits the
installation of the following manufactured devices to those that have been celtified by their
manufacturer to meet or exceed minimum specifications or efficiencies adopted by the
Chief Building Official:
1.
2.
Central air-conditioning heat pumps and other central air conditioners.
Combination equipment: space heating and cooling, or space heating and water
heating.
Fenestration products.
Gas space heaters.
Insulating materials.
Oil fired storage water heaters.
Other heating and cooling equipment.
3.
4.
5.
6.
7.
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February 20, 1996
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8.
9.
10.
11.
12.
13.
14.
15.
Plumbing fittings.
Pool heaters.
Refrigerators, refrigerator-freezers, and freezers.
Room air conditioners.
Slab floor perimeter insulation.
Snowmelt Boilers.
Solid fuel buming devices.
Water heaters.
301.5.1 The certification status of any such manufactured device may be confirmed only by
reference to:
1.
2.
4.
5.
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3.
A directory published or approved by the Chief Building Official; or
A copy of the application for certification from the manufacturer and the letter of
acceptance from the Building Division staff; or
Written confirmation from the publisher of a division-approved directory that a
device has been certified; or
A division-approved label on the device; or
The National Appliance Energy Conservation Act of 1987.
NOTE: Section 301.5 Chapter 3 does not require a builder, designer, owner,
operator, or enforcing agency to test any certified device to determine its compliance
with minimum specifications or efficiencies adopted by the Chief Building Official.
SECTION 302 . CALCULATION OF SOURCE ENERGY CONSUMPTION.
When calculating source energy consumption, consumption of electricity, natural gas, fuel
oil, and LPG shall be converted to BTUs at the rates shown in Table 3-1.
Table 3 - 1
Source Energy Conversion Rates
Energv Source
Btu per unit
Consumption
Electricity
Natural Gas
Fuel Oil
LPG
10,239
100,000
138,400
91,080
Btu/kilowatt-hour
Btu/therm/lOO CF at 14.73 psia
Btu/gallon
Btu/gallon
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SECTION 303 - MANDATORY REQUIREMENTS FOR SERVICE SNOWMELT
SYSTEM AND EQUIPMENT.
303.1 Any service snowmelt system or equipment shall meet the following:
I. Pilot light prohibited.
2. Electric resistance heating is prohibited.
303.2 Snowmelt systems shall include automatic temperature and surface moisture
controls.
SECTION 304 - MANDATORY REQUIREMENTS FOR SOLID FUEIL BURNING
DEVICES.
304.1 Certification. Any solid fuel burning device may be installed only if the
manufacturer has certified that the device complies with all of the applicable
requirements of this section and has been determined by the AspenlPitkin Environmental
Health Department to have emissions less than or equal to 4.1 gmlhr when tested
according to the most stringent test methods for certifying airtight wood stoves or pellet
stoves.
.
SECTION 305 - RESIDENTIAL MANDATORY FEATURES AND DEVICES
Any new residential building shall meet the requirements of this Section.
305.1 Ceilings. The opaque pOltions of ceilings separating conditioned spaces from
unconditioned spaces or ambient air shall meet the requirements of either I or 2 below:
I. Ceilings shall be insulated between wood framing members with insulation
resulting in an installed thermal resistance of R - 30 or greater for the insulation
alone.
AIL TERNA TIVE: Insulation which is not penetrated by framing members may
meet an R-value equivalent to installing R-30 insulation between wood framing
members and accounting for the thermal effects of framing members.
2. The weighted average U-value of ceilings shall not exceed the U-value that would
result from installing R-30 insulation between wood framing members in the entire
ceiling and accounting for the effects of framing members.
When loose fill insulation is installed, the minimum installed weight per square foot shall
conform with the insulation manufacturer's installed design weight per square foot at the
manufacturer's labeled R-value.
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305.2 Walls. The opaque portions of frame walls separating conditioned spaces from
unconditioned spaces or ambient air shall meet the requirements of either 1 or 2 below:
I. Framed walls shall be insulated between framing members with insulation having
an installed thelmal resistance of R -19 or greater. Framed foundation walls of
heated basements or heated crawl spaces shall be insulated above the adjacent
outside ground line with insulation having an installed thetmal resistance of at least
R-19.
AI. TERNA JIVE: Insulation which is not penetrated by framing members may
meet an R-value equivalent to installing R-19 insulation between wood framing
members and accounting for the thermal effects of framing members.
2. The weighted average U-value of walls shall not exceed the U-value that would
result from installing R -19 insulation between wood framing members and
accounting for the effects of framing members.
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305.3 Floors. Concrete raised floors over unconditioned space shall be insulated to an
installed thermal resistance of at least R-19. All other raised floors separating conditioned
space from nnconditioned space shall meet the requirements of either 1 or 2
below:
1.
Floors shall be insulated between wood framing members with insulation having an
installed thelmal resistance of R -19 or greater.
2. The weighted average U-value of floor assemblies shall not exceed the U-value that
would result from installing R -19 insulation between wood framing members and
accounting for the effects of framing members.
AI. TERNA TlVE: Raised floor insulation may be omitted if the foundation walls
are insulated to meet the requirements of either 1 or 2 above, a vapor barrier is
placed over the entire floor of the crawl space, and vents are fitted with
automatically operated louvers that are temperature actuated.
305.4 Installation of Fireplaces, Decorative Gas Appliances, and Gas Logs.
305.4.1 Wood burning fireplaces are prohibited in nonattainment areas of the City of
Aspen and Pitkin County.
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Febmary 20, 1996
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305.4.2 If a masonry or factOly-built fireplace is installed, it shall have the following:
I. CLOSEABLE metal or glass doors covering the entire opening of the firebox;
2. A combustion air intake to draw air from the outside of the building directly into the
fire box, which is at least 6-square inches in area; and
3. A flue damper with a readily accessible control.
EXCEPTION: When a gas log, log lighter, or decorative gas appliance is installed
in a fireplace, the flue damper shall be blocked open as required by the
manufacturer's installation instructions or Section 803 1994 UMC.
305.5. Infiltration Barrier. If an infiltration barrier is installed to meet the requirements of
Sections 306 and 307, it must have an air porosity of less than 5 ft3 per hour per square foot
per inch of mercmy pressure difference when tested in accordance with the requirements of
ASTM E-283-84. If a vapor barrier functions as an infiltration balTier it shall be located on
the conditioned side of the exterior framing.
305.6 Vapor Barriers. A vapor ban'ier shall be installed on the conditioned space side of
all insulation in all exterior walls, attics, and crawl spaces to protect insulation from
condensation.
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305.7 Space Conditioning Eqnipment.
305.7.1 Building design heat loss rate and design heat gain rate, shall be detennined using a
method based on anyone of the following:
I. The American Society of Heating, Refrigeration, and air-conditioning Engineers
(ASHRAE) Handbook and Product DirectOlY, Equipment Volume (1988), Systems
and Applications Volume (1987), and Fundamentals Volume (1989), or
2. The Sheet Metal Air Conditioning Contractors National Association (SMACNA)
Load Calculation Manual, or
3. The Air Conditioning Contractors Of America (ACCA) Manual J.
The design heat loss rate and design heat gain rate are two of the criteria that shall be used
for equipment sizing and selection.
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NOTE: Heating Systems must meet the minimum heating capacity required by
UBC Section 310.11. The furnace output capacity and other specifications are
published in the Building Department's directOlY of certified equipment or other
directories approved by the Chief Building Official.
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305.7.2 Design Conditions. For the purpose of sizing the space conditioning (HV AC)
system, the indoor design temperatures shall be 70 degrees Fahrenheit for heating. The
outdoor heating design temperature shall be -15"F. The outdoor cooling design dry bulb
temperature shall be 810F. The outdoor cooling design wet bulb temperature shall be 590F.
305.8 Setback Thermostats. All heating and/or cooling systems other than solid fuel
burning devices shall have an automatic thermostat with a clock mechanism or other
setback mechanism approved by the Chief Building Official that shuts the system off during
periods of non-use and that allows the building occupant to automatically set back the
thermostat set points for at least 2 periods within 24 hours.
EXCEPTION: Gravity gas wall heaters, gravity floor heaters, gravity room heaters,
room air conditioners, and room air conditioner heat pumps need not comply with
this requirement. Additionally, room air conditioner heat pumps need not comply
with Section 305.1.8.
305.9 Pipe and Tank Systems.
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305.9.1 Hot water tanks shall be externally wrapped with insulation having an installed
thermal resistance of R-12 or greater or have intemal insulation of at least R-16 and a label
on the exterior of the tank showing the insulation R-value.
305.9.2 The piping for all space conditioning and service water heating systems, in
unconditioned spaces; and, the first five feet of hot and cold water pipes from the storage
tanks of non-recirculating systems shall be insulated in accordance with Table 3-2.
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Pipe Insulation Requirements
Minimum R- Value
System Pipe Diameter
Less than or equal to Greater than 2"
2"
Domestic Hot Water R-4 R-6
Hydronic Heating Supply Lines R-4 R-6
Cooling Systems (pipes below R-3 R-4
55OF)
Table 3.2
EXCEPTION: The following piping does not have to be thermally insulated:
1. Factory-installed piping within space conditioning equipment
2. Piping that conveys fluids that have a design operating temperatnre range between 55
degrees and 105 degrees Fahrenheit.
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3. Gas piping, cold domestic water piping, condensate drains, vents, or waste piping.
4. Where the heat gain of heat loss to or from piping without insulation will not increase
building sonrce energy use.
NOTE: Where the Chief Building Official approves a water heater calculation
method for a particular water heating recirculation system, piping insulation
requirements shall be those specified in the approved calculation method.
305.9.3 Solar water heating systems and/or collectors shall be certified by the Solar Rating
and Celtification Corporation.
305.10 Slab Edge Insulation. Material used for slab edge insulation shall meet the
following minimum specifications:
1. Water absorption rate no greater than 0.3 percent when tested in accordance with
ASTM-C-271.
2. Water vapor pelmeance no greater than 2.0 perm/inch when tested in accordance
with ASTM-E-96-90.
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3.
Concrete slab perimeter insulation must be protected from physical damage and
ultra violet light deterioration.
305.11 Ducts and Fans.
305.11.1 Air handling duct systems shall be installed and sealed to meet the requirement of
UMC Sections 604. Portions conveying conditioned air shall either be insulated to a
minimum installed level of R-4.2 (or any higher level required by UMC Section 604) or be
enclosed entirely in conditioned space. Zone ill shall be used for the purpose of this
Section, unless another Zone is approved by the Chief Building Official.
305.11.2 All duct insulation product R-values shall be based on insulation only (excluding
air films, vapor barriers, or other duct components) and tested C-values at 750p mean
temperature at the installed thickness, in accordance with ASTM C518-85 or ASTMCl77-
85.
305.11.3 The installed thickness of duct insulation used to determine its R-value shall be
detennined as follows:
1.
For duct board, duct liner and factory-made rigid ducts not nOlmally subjected to
compression, the nominal insulation thickness shall be used.
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2.
For duct wrap, installed thickness shall be assumed to be 75 percent (25 percent
compression) of nominal thickness.
3. For factory-made flexible air ducts, the installed thickness shall be determined by
dividing the difference between the actual outside diameter and nominal inside
diameter by 2.
305.11.4 Insulated flexible duct products installed to meet this requirement must include
labels, in maximum intervals of 10 feet, showing the thermal pelfOlmance R-value for the
duct insulation itself (excluding air films, vapor barriers, or other duct components),based
on the tests in Section 305.1.11.2 and the installed thickness determined by Section
305.1.11.3.3.
305.11.5 All fan systems, regardless of volumetric capacity, that exhaust air from the
building to the outside shall be provided with backdraft or automatic dampers to prevent air
leakage.
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305.11.6 All gravity ventilating systems that serve conditioned space shall be provided with
either automatic or readily accessible, manually operated dampers in all openings to the
outside except combustion inlet and outlet air openings and elevator shaft vents.
EXCEPTION: The requirements do not apply to ducts and fans integral to
combustion air ducts of solid fuel burning devices or fireplaces.
SECTION 305.12 - Mandatory Requirements for Outside Private Pools and Spa
Heating Systems and Equipment.
305.12.1 Certification by Manufacturers. Any pool or spa heating system or
equipment may be installed only if the manufacturer has certified that the system or
equipment has all of the following:
1. A readily accessible on-off switch, mounted on the outside of the heater, that
allows shutting off the heater without adjusting the thermostat setting; and
2.
A permanent, easily readable, and weatherproof plate or card that gives instruction
for the energy efficient operation of the pool or spa and for the proper care of pool
or spa water when a cover is used; and
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3.
No electric resistance heating; and
EXCEPTION Pools or spas deriving at least 60% of the annual heating energy
from nondepletable sources.
4. No pilot light.
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February 20, 1996
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305.12.2 Installation. Any pool or spa heating system or equipment shall be installed
with all of the following:
1. At least 36" of pipe between the filter and the heater, to allow for the future
addition of solar heating equipment; and
2. Directional inlets and time switches for pools.
2.1 The pool shall have directional inlets that adequately mix the pool water;
and
2.2 The circulation pump shall have a time switch that allows the pump to be
set to run in the off-peak electric demand period, and for the minimum
time necessary to maintain the water in the condition required by
applicable public health standards.
EXCEPTION: Where applicable public health standards require on-peak
operation.
2.3
Outdoor pools or spas with a volume of water :2: 10,000 gallons shall not
be heated.
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EXCEPTION: Heating systems deriving 100% of energy from
nondepletable sources.
SECTION 305.13 - Natnral and Liquid Propane Gas Central Furnaces, Cooking
Equipment, Private Pool and Spa Heaters and Snowmelt:
305.13.1 Pilot Lights Prohibited. Any natural or liquid propane gas system or equipment
listed below may be installed only if it does not have a continuously burning pilot light:
1. Fan type central fnrnaces.
2. Household cooking appliances.
3. Private pool heaters.
4. Private spa heaters.
5. Snowmelt heaters.
SECTION 305.14 - Mandatory Requirements for Exterior Doors, Windows, and
Fenestration Prodncts.
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305.14.1 Any manufactured doors or windows or manufactured fenestration product may
be installed only if the manufacturer has certified to the Chief Building Official, or if an
independent certifying organization approved by the Chief Building Official has certified,
that the product complies with all of the applicable requirements of this subsection.
305.14.1.1 Manufactured doors and windows shall have air infiltration rates not
exceeding those shown in Table 3-3, when tested according to ASTM E283-91 at a
pressure differential of 75 pascals or 1.57 pounds/ft2.
305.14.1.2 Manufactured fenestration products shall:
I. Be certified as to their overall U-values as rated in accordance with the National
Fenestration Rating Council's NFRC-IOO-91 (June 28,1991), or in accordance
with a default table method approved by the Chief Building Official; and
2. Have a temporary label, not to be removed before inspection by the enforcement
agency, listing the certified U-values(a)1. are met; and
3.
Have a permanent label listing the U-value, certifying organization, and rating
procedures or a label to allow tracking back to the original certification
information on file with the certifying organization.
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Table 3-3
MAXIMUM AIR INFILTRATION RATES
TYPE RATE
Windows
cfmlft2 of operable sash crack
All 0.37
Residential Doors swinging, sliding 0.37
cfm/ft2 of door area
All Other Doors sliding, swinging (single door 0.37
cfm/ft2 of door area
swinging (double door 1.0
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305.14.2 Site constructed doors, skylights, and widows, including, but not limited to,
field manufactured doors, skylights, and windows, shall be caulked between the door,
skylights, or window and the building, and shall be weather-stripped.
EXCEPTION: Unframed glass doors and fire doors.
SECTION 305.15 - Mandatory Requirements for Joints and Other Openings. Joints
and other openings in the building envelope that are potential sources of air leakage shall
be caulked, gasketed, weather-stripped, or otherwise sealed to limit infiltration and
exfiltration.
SECTION 305.16 . Compliance Methods. All residential buildings shall meet alLof the
following:
I. The mandatory requirements.
2. Either the performance standards or the prescriptive standards or the requirements
of the Colorado Green Program.
SECTION 306 - RESIDENTIAL PRESCRIPTIVE COMPUANCE
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306.1 Buildings that are certified to meet the requirements of the Colorado Green Program
are Exempt from meeting the prescriptive requirements.
EXCEPTION: Buildings that contain snowmelt, pool, or spa systems.
Any changes to the building design will nullify the Colorado Green exemption.
306.2 Buildings comply with the prescriptive standards if they meet the requirements of
MEC CHECK, version 2.0. Chapter 2 of MEC CHECK is omitted and replaced by the
mandatory requirements of Section 305.
306.3 The prescriptive standards do not allow the inclusion of snowmelt. (Snowmelt
requires compliance demonstration with the performance computer standard.)
306.4 The prescriptive standards do not allow the inclusion of pool and spa energy use.
(Pool and spas require compliance demonstration with the performance computer
standard).
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SECTION 307 . RESIDENTIAL PERFORMANCE COMPLIANCE
307.1 Performance Standards. A building complies with the pelformance standard if its
combined calculated depletable energy use for water heating (Section 307.1.1), space
conditioning (Section 307.1.2), SNOWMELT (Section 307.1.3), and pool and spa heating
(Section 307.1.4), is less than or equal to the combined maximum allowable energy use for
both water heating, and space conditioning, even if the building fails to meet either the
water heating, or space conditioning, budget alone.
EXCEPTION: Buildings that are certified to meet the requirements of the
Colorado Green Program and do not have snowmelt, swimming pool or spa heating
system equipment comply with the pelfOlmance standard.
307.1.1 Water Heating Budgets. The budgets for water heating systems are those
calculated from Equation 3-1.
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Equation 3.1
ANNUAL WATER HEATING BUDGET (AWB):
For dwelling units less than 2500 ft2:
A WB (kBtu/yr.-ft2) = (14000) + 4.85
CFA
For dwelling units equal to or greater than 2500 ft2:
AWB (kBtu/yr.-ft2) = (26125)
CFA
Where CFA = the building's conditioned floor area in square feet.
The annual water heating budget calculated from Equation 3-1 may be met by either:
1. Calculating the energy consumption of the proposed water heating system using an
approved calculation method or
2. Installing any gas storage type non-recirculating water heating system that does not
exceed 50 gallons of capacity, meets the minimum standards specified in the
Appliance Efficiency Standards, and either has an R-12 external insulation wrap or
has been determined by the Chief Building Official to meet the annual water heating
budget calculated from Equation 3-1 without an external insulation wrap.
307.1.2 Space Conditioning Budget. Space conditioning budgets shall be the calculated
consumption of energy from depletable sources required for space conditioning in buildings
in which the requirements for the prescriptive compliance (Section 306) are installed. To
determine the space conditioning budget, use an approved calculation method.
307.1.3 Snowmelt Energy Use (not a budget) Snowmelt energy use shall be the
consumption of snowmelt system and equipment energy from depletable sources used for
melting snow. Snowmelt energy use for dwelling units is that calculated, using an approved
method, by a mechanical engineer licensed by the State of Colorado. Snowmelt energy use
shall be added to the subtotal source energy consumption calculated as per the requirements
of Section 307.2.2.2.
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307.1.4 Pool and Spa Energy Use (not a budget) Pool and spa energy use shall be the
consumption of energy from depletable sources used for heating pools and spas. Pool and
spa energy use is that calculated, using an approved method, by a mechanical engineer
licensed by the State of Colorado. Pool and spa energy use shall be added to the subtotal
source energy consumption calculated as per the requirements of Section 307.2.2.
307.2 Compliance Demonstration Requirements for Performance Standards. The
application for a building permit shall include documentation which demonstrates, using an
approved calculation method, the compliance version of the City of Aspen/Pitkin County
Energy Conservation Code's Public Domain Computer Program or any alternative
calculation method approved by the Chief Building Official, that the new building has been
designed so that its total source energy consumption from depletable energy sources does
not exceed the combined water heating and space conditioning budgets.
307.2.1 To demonstrate compliance, the applicant's documentation shall determine the
combined energy budget for the proposed building by adding the following:
1. The annual water heating budget calculated from Equation 3-1 (kBtn/yr.-ft2); and
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2. The annual space conditioning budget (kBtulyr.-ft2) as determined pursuant to
Section 307 .1.2.
307.2.2 Calculate the source energy consumption subtotal of the proposed building, using
the proposed building's actual glazing area, orientation, and distribution, and its actual
energy conservation and other features, including the actual water heating, space
conditioning equipment and duct conditions and locations. To determine the subtotal
source energy consumption, use an approved calculation method. Add snowmelt energy
use and pool and spa energy use to obtain total source energy consumption.
Include in the calculation the energy required for building cooling even if the building plans
do not indicate that air conditioning will be installed.
307.2.3 The proposed building design complies if the total source energy consumption
pursuant to Section 307.2.2 is equal to or less than the combined energy budget
established in Section 307.2.1.
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February 20, 1996
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307.3 Required Calculation Assumptions. The Chief Building Official shall publish the
assumptions and calculation methods it nsed to develop the standards for residential
buildings, including those specified in Section 307. In determining the water heating and
space conditioning budgets and calculating the energy use of the proposed building design,
snowmelt energy use, and private pool and private spa energy use, the applicant shall use
only these assumptions and calculation methods (or alternative assumptions and methods
approved by the Chief Building Official).
307.3.1 Such assumptions shall include, but not be limited to, the following:
1. The operating conditions regarding indoor temperature; occupancy loads and
schedules; equipment loads and operation schedules, including lighting, HV AC, and
miscellaneous electrical; and outdoor weather conditions;
2. The physical characteristics of building pressurization, interior heat transfer, film
coefficients, shading coefficient and operation of installed shading devices, ground
temperatures, and the method of determining slab heat loss;
3. The applicable modeling procedures for the assumptions, design conditions, and
physical characteristics described in Section 307.2.
EXCEPTION: The Chief Building Official may approve alternative schedules,
assumptions, and perfOlmance modeling procedures that may be used in lieu of
those described in Section 307.3.1, provided such alternatives do not alter the
efficiency level required by these standards.
307.3.2 The total calculated annual energy consumption shall include all energy used for
comfort heating, comfort cooling, ventilation for the health and comfOlt of occupants,
service water heating, snowmelt, and private pool and private spa heating.
307.3.3 Heat transfers within the same building to adjacent spaces that are not covered by
the pelmit and that are independently provided with space conditioning may be considered
to be zero. Heat transfers to spaces not yet provided with space conditioning may be
modeled as separate unconditioned zones, or as outdoor conditions.
307.3.4 The total calculated annual energy consumption need not include energy from any
nondepletable sources, regardless of the purpose of the energy consumed.
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307.3.5 The U-value of installed manufactured fenestration products shall meet the
requirements of Section 305.1.14. The U-value of site-built fenestration products shall be
those published by the Chief Building Official, based on an approved method that
determines the area weighted average U-value for generic types of products.
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Febmary 20, 1996
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307.3.6 Shading coefficients for interior devices used with fenestration products shall be
taken from Tables 25, 26, and 27 of Chapter 27 of the ASHRAE Handbook of
Fundamentals (1989), except that the minimum shading coefficient that shall be assumed
for any interior shading device is 0.66.
SECTION 308 - RESIDENTIAL ADDITIONS
SECTION 308.1 Additions. Scope Additions to existing residential buildings shall meet
the requirements of Sections 303, 304, and 305; and, the requirements of this section. The
U-value of any fenestration product replaced or added as part of an addition shall not exceed
0.4 as defined by the National Fenestration Rating Council (i.e. whole product
petforrnance ).
308.2 Prescriptive Approach. Additions to existing buildings shall meet the requirements
of Section 306.
308.3 Performance Approach. Petforrnance calculations shall meet the requirements of
either 1 or 2, below:
1.
The addition complies if the addition alone meets the combined water heating and
space conditioning energy budgets.(see Section 307.2).
.
2.
The addition complies if the energy efficiency of the existing building is improved
such that the total source energy consumption of the improved existing building
and the addition is equal to or less than that of the unimproved existing building
plus an addition that complies with the applicable energy budget (see Section
307.2).
SECTION 309 . RESIDENTIAL AL TERA TIONS
309.1 Alterations .. Scope. Alterations to existing residential buildings shall meet any
requirements of Sections 303, 304, and 305 that apply to the system or envelope component
being changed and the requirements of this section. The U-value of any fenestration
product replaced or added as part of an alteration shall not exceed 0.4 as defined by the
National Fenestration Rating council (i.e. whole product pelforrnance).
NOTE: Fenestration products repaired or replaced, not as part of an alteration, need
not comply with the U-value requirements applicable to alterations.
SECTION 310 . NONRESIDENTIAL BUILDINGS Shall comply with Chapter 7 of the
MEC, and Section 303 of this code.
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February 20, 1996
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