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What is Long Term Thermal Resistance (LTTR)? Click here to find out.
| Long-Term Thermal Resistance (LTTR)* |
| TAPERED ACFOAM® COMPOSITE/PB |
| MARKING |
THICKNESS |
SLOPE PER |
AVERAGE |
| |
in |
mm |
foot |
30.5 cm |
LTTR Value |
RSI |
| A |
1.0"-1.5" |
25-38 |
1/8" |
3 mm |
5.9 |
1.04 |
| B |
1.5"-2.0" |
38-50 |
1/8" |
3 mm |
8.9 |
1.57 |
| C |
2.0"-2.5" |
50-63 |
1/8" |
3 mm |
12.0 |
2.11 |
| D |
2.5"-3.0" |
63-76 |
1/8" |
3 mm |
15.1 |
2.66 |
| G |
1.0"-2.0" |
25-50 |
1/4" |
6 mm |
7.4 |
1.30 |
| H |
2.0"-3.0" |
50-76 |
1/4" |
6 mm |
13.5 |
2.38 |
| XX |
1.0"-3.0" |
25-76 |
1/2" |
12 mm |
10.4 |
1.83 |
| * Long-term thermal resistance values were determined in accordance with CAN/ULC-S770. All test samples were third-party selected and tested by an accredited material testing laboratory. The R-value for .5 in. perlite (1.39) was provided by ASHRAE Handbook, Fundamentals. The R-value of .55 for 7/16 OSB was provided by APA-The Engineered Wood Association, which cited ASHRAE Handbook, Fundamentals. The R-value for .25 in. glass-mat gypsum board (.28 R-value) was provided by the glass-mat gypsum board manufacturer. | |
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