Masonry Magazine October 1986 Page. 22
TABLE I R-Values for Compiling Tables
| Item | R-Value |
|---|---|
| Insulation: | |
| Vermiculite Loose Fill | 2.22/inch |
| Perlite Loose Fill. | 2.86/inch |
| I" Extruded Polystyrene | 5.00 |
| 2" Expanded Polystyrene | 8.00 |
| 2" Extruded Polystyrene | 10.00 |
| 2" Polyisocyanurate | 14.40 |
| 3" Extruded Polystyrene | 15.00 |
| 3" Polyisocyanurate | 21.60 |
| R-11 Fibrous Batt | 11.00 |
| R--13 Fibrous Batt | 13.00 |
| R-19 Fibrous Batt | 19.00 |
| Gypsum Board, ½" | 0.45 |
| Gypsum Board, Foil Back, with air space. | 3.00 |
| Surface Conductance: | |
| Outside (15 mph wind) | 0.17 |
| Inside | 0.68 |
| Air Space Conductance ¼"-4" | 0.97 |
| 4" Solid Units for Cavity Wall Facing | 0.44 |
| Concrete Used for Units: | |
| 60 lb/cu. ft. dry wt. | 1.66/inch |
| 80 lb/cu. ft. dry wt. | 2.48/inch |
| 100 lb/cu. ft. dry wt. | 3.69/inch |
| 120 lb/cu. ft. dry wt. | 5.51/inch |
| 140 lb/cu. ft. dry wt. | 8.22/inch |
FIGURE I Thermal Bridging
A
EMPTY
OR
FILLED
EMPTY
OR
FILLED
A = Length of Masonry Unit (inches)
B = Width of Masonry Unit (inches)
Lw= B - 2fs
21, 22, 23 = Thickness of Webs (inches)
2w = 21 + 22 + 23
A
ac= 1 - aw