R-Value
42.84
Benchmark Retrofit - Cavity (Modified) R-Value inches (per inch)
Type Outside Air Film Solid Brick Air-gap Mineralfibre (Batt) 3" Mineralfibre Inbetween (batt) Mineralfibre (Batt) Gypsum White Board Inside Air Film Thickness R-Value
16 1 5.5 3 5.5 0.625
0.1
R-Value (total) ft2.F.h/BTU 0.17 1.6 1 19 11 19 0.56 0.68
31.625 52.84
Figure 12 –Modified benchmark on-grade wall plan
Insulation: Mineralwool Batts (replace Rockwool batts) Construction: 1.5”x5.5” wood studs @ 16” o/c, double wall Cavity R-Value: 52.84 ft2.F.h/BTU Framing R-Value: 7.215 ft2.F.h/BTU Framing Factor: 0% Overall R-Value: 43.47 ft2.F.h/BTU Overall U-Value: 0.023 BTU/h °F ft² Thickness of Section: 31.625” 4.2.3
Floors
Retrofit of the existing frame floor (between the first floor and basement has been proposed. Carpet floor with a plywood sub-floor are proposed. It is proposed that 3.5” of sound insulation batt be filled in the 9.5” deep joist cavity. The frame floor is to be covered with 5/8” Gypsum white board. Sound insulation is assumed to be fiberwool batt insulation as it is the most commonly used sound insulation. Benchmark Retrofit - Cavity