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May 04, 2018
RE: Aspen Mountain Booster Station
Aspen CO 81611
Permit No. 00023-2018-ARBK
Subject: Response to Building Comments
Attachments: Building Comments
As always, thank you for your Department's attention to detail and the Comments provided. For the
Aspen Mountain Booster Station, we have some comments and concerns before we spend more time
revising Drawings & Details or producing further analysis.
This 386 -gross square foot structure is intended to house the booster pumps needed as part of Aspen
Skiing Company's snow -making system on Aspen Mountain. As such, this is essentially an uninhabited
building to house an industrial type function and needs to be constructed of durable materials. The heat
provided for this small structure is not intended to condition the space, the purpose is to provide freeze
protection of the equipment. Also, regarding heat & lighting, this structure is not intended to be
habitable except for the occasional maintenance requirements. Given the de-minimis scale & function of
this structure, we are seeking relief to the costly, time-consuming, and impracticality of adhering to
some Comments as described below.
Comment No. 1, Slab Edge Insulation: On the Drawings dated 03.01.18, clouded Revision No. 2,
we had added a Table with Insulation Requirements (adjacent to Section2A/A-101). With this
table we included a description of the requirement for Slab Edge Insulation. We felt this would
be sufficient to give the Contractor direction but allow that Trade to respond to field conditions
as appropriate. We can add a graphic detail to our Section, but request that we be allowed to
lower the exterior insulation where it passes under the concrete slab at the exterior door. We
can add this additional graphic to a Construction Set.
Comments No's. 2, 3, & 7, Insulation Values: As mentioned above, the heat load for this
structure is very limited. Nonetheless, we have selected a 6 %" SIP which has a U of .041-.044,
this seems very adequate. Likewise, the CMU (less than 1/3 the exposed wall envelope) is an
integrally & continuously insulated unit that comes in a fraction under R-14. This durable
material is at the lower, most vulnerable (and least heat loss) portion of the walls. Together
these two products seem sufficient without having to add the cost & complexity of additional
materials or producing further analysis.
Z-GroUD Architects. P.C. • 411 East Main Street. Aspen. CO. 8161 1 9 Telephone: 970-925-1832 • Fax: 970-925-1371
• Comment No. 4, Lighting: Very limited lighting, very limited occupancy. The fixtures (2 each) are
a LED T8 vapor tight fixture manufactured by MaxLite. The time & cost of further analysis does
not seem necessary.
• Comment No. 5, Ceiling Material: Ceiling material is FRP, just like the interior wall finish. We can
certainly make sure that note is added to a Construction Set.
• Comment No. 6, Air Blower Test: The pump manufacture requires a 2515 CFM outlet exhaust
fan with a corresponding inlet damper on the opposite side of the space, these two openings
are power -to -open, spring -to -close. Given this functional requirement, and the low heat
requirement, we are not sure of the viability (or pass -ability) of a blower test as this will be an
enormous weak point in the overall building envelope. Note 26 of the Project Notes describes
caulking procedures.
Thank you for your agention and consideration.
Best
Seth Hmielowski
Principal
Z -Group Architects, PC
■s
■N Z -Group Architects. P.C. • 41 1 East Main Street. Aspen, CO. 8161 1 • Telephone: 970-925-1832 • Fax: 970-925-1371