HomeMy WebLinkAboutFile Documents.210 S 1st St.0281.2017 (6).ARBK 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*h/Btu
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*h/Btu
Total Roof R-Value—49 °F*ft2*h/Btu
Interior Conditions—70°F and 35% RH=>Dew Point= 41°F
R-Value at 41°F Dew Point:
° f a
49 F • t • 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.
R
210 S. First St.Residence Aspen,Colorado-Roof Dew Point Analysis-17146 b 2 2 017
ASPEN
BUILDING DEPARTMENT