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Shield Thickness and R-Value 
Polyisocyanurate Cavity Wall and Foundation Insulation
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| Standard Thickness |
in. |
1/2" |
5/8" |
3/4" |
1" |
1.5" |
2" |
2.5" |
3.0" |
| mm. |
13 |
16 |
19 |
25 |
38 |
51 |
63.5 |
76.2 | |
| R-Value* |
3.3 |
4.1 |
5.0 |
6.5 |
9.6 |
12.8 |
16.0 |
19.0 | |
| RSI |
.58 |
.72 |
.88 |
1.14 |
1.69 |
2.25 |
2.82 |
3.34 | |
| Pieces per Pkg. |
45 |
36 |
31 |
23 |
15 |
11 |
18 |
15 | |
| 4´ x 8´ Size - Sq. Ft./Pkg. |
1440 |
1152 |
992 |
736 |
480 |
352 |
576 |
480 | |
| 4´ x 9´ Size - Sq. Ft./Pkg. |
1620 |
1296 |
1116 |
828 |
540 |
396 |
648 |
540 | |
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* Conditioned thermal values were determined by ASTM Test Method C 518 at 75° F mean temperature. All test specimens were conditioned in accordance with procedures outlined in ASTM C 1289-02, Section 11.1.2.1 | |||||||||