R/Factor: (Thermal Resistance)
A measure of ability
to retard heat flow rather
than ability to transmit heat. |
Wood bevel siding, 1/2X8 lapped |
R-0.81 |
Wood siding
shingles 16" 7-1/2" exposure |
R-0.87 |
Stucco, per inch of thickness |
R-0.20 |
Building Paper |
R-0.06 |
1/2" Foil
2 Sides Insulation Board |
R-3.6 |
1" Foil
2 Sides Insulation Board |
R-7.2 |
2" Foil
2 Sides Insulation Board |
R-14.4 |
1/2" Blue
Dow Styrofoam |
R-3.0 |
1" Blue
Dow Styrofoam |
R-5.0 |
2" Blue
Dow Styrofoam |
R-10 |
3/8" Plywood |
R-0.47 |
1/2" Plywood |
R-0.62 |
5/8" Plywood |
R-0.78 |
Pine Board
3/4" |
R-0.94 |
Spruce Boards
per 1" of thickness |
R-1.25 |
Common Brick
per 1" of thickness |
R-0.20 |
Face Brick
per 1" of thickness |
R-0.11 |
1/2" Gypsum
Board |
R-0.45 |
5/8" Gypsum
Goard |
R-0.56 |
25/32" Finish
Hardwood Flooring |
R-0.68 |
Vinyl Flooring |
R-0.05 |
Carpet and fibrous pad |
R-2.08 |
Asphalt Roof Shingles |
R-0.44 |
Wood Roof Shingles |
R-0.94 |
