Energy Efficient Housing

Energy Efficient Housing Construction


Table 1. Thermal resistance values of building materials (R-values)

Material

R Value

RSI

General
Outside Air Film0.17 0.03
3/8 sheathing (9mm)0.45 0.08
1 inch solid wood (25mm)1.25 0.22
8 inches concrete (200mm)1.49 0.26
1/2 inch gypsum board (12mm)0.42 0.07
3/4 inch interior wood finish (19mm)0.94 0.17
 
Walls
Inside Air Film0.69 0.12
1/2 inch minimum air space (12mm)0.98 0.17
1/2 inch air space/reflective surface (12mm)2.66 0.47
1 inch glass/mineral fibre (25mm)2.97 0.52
1 inch expanded polystyrene (25mm)3.96 0.69
1 inch extruded polystyrene (25mm)4.96 0.87
1 inch rigid glass fibre (25mm)4.25 0.74
1 inch rigid urethane/isocyanurate (25mm)7.50 1.31
1/2 inch hardboard siding (12mm)0.73 0.13
3/4 inch drop siding (19mm)1.06 0.19
4 inches clay brick (100mm)0.42 0.07
5/8 inch stucco (15mm)0.12 0.02
Metal/vinyl siding with backing1.41 0.25
 
Ceilings
Inside Air Film0.60 0.11
4 inches cellulose fibre (100mm)14.45 2.53
4 inches wood shavings (100mm)9.66 1.69
4 inches blown glass fibre (100mm)11.88 2.1
4 inches Vermiculite (100mm)8.23 1.44
Asphalt shingles0.45 0.08
Wood shingles0.94 0.16
 
Floors
Inside Air Film0.93 0.16
Resilient floor coverings0.08 0.01
Carpet (rubber/foam underlay)1.29 0.23
Carpet (fibre underlay)2.09 0.37
3/4 inch hardwood flooring (19mm)0.69 0.12

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