HomeMy WebLinkAboutFile Documents.373 Relay Rd.0080.2017 (4).ARBK
12600 Yukon Ave. | Hawthorne, CA 90250 | 310.202.0066 O | 310.202.0044 F
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May 5, 2017
Jenny Trumble
CCY Architects
228 Midland Avenue
Basalt, CO 81621
Dear Jenny:
Please find herein our theoretical “U” value calculations for the single swing door proposed for the remodel at 373 Relay Road, located in
Aspen, CO. These values are provided per your request and according to the City of Aspen’s requirements. We have chosen to calculate
u-values for the door assembly using ASHRAE calculation methodology, as defined by the City’s IRC Building Submittal Guide.
Using these methods, the average u-value for all fenestration is 0.28 Btu/hr-ft2. A summary of the data is presented below and detailed
documentation is presented in the attached Appendices.
The system proposed for the project is:
▪ Swing doors: Schuco ADS 65 HD
This proposed door system is manufactured using thermally-broken aluminum profiles. The thermal break is created with thermo-plastic ISO
bars connecting inner and outer aluminum profiles. The ISO bars are rolled and pressed into the aluminum profiles – this system is not
fabricated from nor incorporate poured-in-place/debridged thermal breaks.
All u-value calculations for the systems proposed are based on the following ASHRAE formula:
Uo = (Ucg x Acg) + (Ueg x Aeg) + (Ufr x Afr)
Ao
Where
▪ Uo = “U” value of the overall window assembly
▪ Ucg = “U” value of the center of glass – set at 0.23 per Old Castle GlasSelect®
▪ Ueg = “U” value of the edge of glass – set at 0.31 for two (2) low-E coatings
▪ Ufr - swing = “U” value of the ADS 65 door frame – set at 0.55 per ATI report
▪ Ufr - slider = “U” value of the ASS 50 door frame – set at 0.79 per ATI report
▪ Ufr - fixed = “U” value of the FW 50 window frame – set at .39 for per ATI report
▪ Ufr - csmt = “U” value of the AWS 102 window frame – set at 0.44 per ATI report
▪ Aeg = Area of edge of glass – defined as a 2-1/2” band around the perimeter of glass area
12600 Yukon Ave. | Hawthorne, CA 90250 | 310.202.0066 O | 310.202.0044 F
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▪ Acg = Area of center of glass – defined as the total glass area less the “edge-of-glass” area
▪ Afr - swing = Area of ADS 65 door frame only – calculated using 3-7/8” frame face width
▪ Afr - slider = Area of ASS50 window frame only – calculated using 3-3/4” frame face width
▪ Afr - fixed = Area of FW50 window frame only – calculated using 1-15/16” frame face width
▪ Afr - csmt = Area of AWS 102 window frame only – calculated using 2-5/16” frame face width
▪ Ao = Overall area of the window.
The dimensions of the unit as currently designed was input into a spreadsheet. The spreadsheet is codified with the ASHRAE formulas (and
available for review upon request). The square footage and u-value for the unit is calculated, as well as the total system u-value.
Thank you for the opportunity to present this information. I trust you will find it useful and informative. If you have any questions, concerns,
or if there is anything else you need - please do not hesitate to contact me.
Sincerely,
Matthew Cyr
TRÜ Architectural
AA-1
APPENDIX A
ASHRAE Calculations: ADS 65
ADS 65 Units U-Value Width Height Average U-CG U-EG U-FR Area
203 0.28 42 120 0.280 0.17 0.31 0.55 35.0
0 0 0.000 0.23 0.31 0.55 0.0
0 0 0.000 0.23 0.31 0.55 0.0
0 0 0.000 0.23 0.31 0.55 0.0
0 0 0.000 0.23 0.31 0.55 0.0
0 0 0.000 0.23 0.31 0.55 0.0
0 0 0.000 0.23 0.31 0.55 0.0
0 0 0.000 0.23 0.31 0.55 0.0
0 0 0.000 0.23 0.31 0.55 0.0
Average U-Value for ADS65 0.28 35.0