HomeMy WebLinkAboutMaster Permit.1015 Waters Ave.0204.2019 (45).ARBK t.onsudtin bn:ineers
#` 569 S. Westgate Drive, Suite #1, Grand Junction, CO 81505
Phone 970-241-8709 Fax 970-241-9514
April 3, 2018
Pitkin County Building Department
530 East Main Street
Aspen, CO 81611
RE: New Residence. Block 41 Lot D & E (1015 Waters) Aspen, CO 81611
Please accept this letter as a request for exemption from the ResCheck document normally
required for a residential project.
All construction in this project meets the prescriptive code requirements of the 2015
International Energy Conservation Code.
The new roof will meet the prescriptive value of R-49 from Table 402.1.1.
The new walls will meet the prescriptive value of R-21 (R20 cavity insulation + R5 continuous
insulation) from Table 402.1.1.
The new windows will have a fenestration u-factor equal to (or better than) the 0.28 (most are
0.28)factor listed in table 402.1.1.
The new glass doors will have a fenestration u-factor equal to (or better than) the 0.28 factor
listed in table 402.1.1.
Copies of the windows and their specifications can be forwarded to you should you want to
verify the values above.
Please let us know if you require any further documentation or discussion regarding the above
information and the contractor, architect and I will be happy to provide it for you.
Sincerely,
M. Blaine Buck, P.E. ��•������
Vice President „7c13 "
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RECEIVED
04/06/2018
ASPEN
BUILDING DEPARTMENT
Bighorn Consulting Engineers,Inc.
ROOF DEW POINT ANALYSIS
Outside air film—0.17 °F*ft2*h/Btu
Roofing Material—0.33 °F*ft2*h/Btu
5/8"plywood—0.77 °F*ft2*hBtu
Joists roof framing with spray foam insulation— 8" at R5.8/inch=>46.4 °F*ft2*h/Btu
5/8" gypsum board—0.56 °F*ft2*h/Btu
Inside air film—0.61 °F*ft2*hBtu
Total Roof R-Value—49 °F*ft2*hBtu
Interior Conditions—70°F and 35% RH=>Dew Point = 41°F
R-Value at 41°F Dew Point:
49 °F •f t2 • h
99°F L T x (70°F DB — 41°F DP) = 14.35 Btu
This implies the dew point falls inside the spray foam insulation.
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1015 Waters Residence Aspen,Colorado-Roof Dew Point Analysis- 18030 ($ v b(/2 018
ASPEN
BUILDING DEPARTMENT