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What is Long Term Thermal Resistance (LTTR)? Click here to learn more.
ACFoam Recover Board
LTTR-Values & Thicknesses |
|
THICKNESS |
LTTR-VALUE |
RSI |
PCS/
PKG |
METAL
DECK FLUTE SPANABILITY |
|
IN |
MM |
IN |
MM |
|
.05
.75
1.0
1.5
1.8 |
12.70
19.05
25.40
38.10
45.72 |
3.0
4.5
6.0
-
- |
.53
.79
1.06
-
- |
46
31
23
-
- |
-
-
-
4 3/8"
4 3/8" |
-
-
-
111.13
111.13 |
2.0
2.5
2.7
3.0
3.4 |
50.80
63.50
63.58
76.20
86.38 |
-
-
-
-
- |
-
-
-
-
- |
-
-
-
-
- |
4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8" |
111.13
111.13
111.13
111.13
111.13 |
3.5
4.0 |
88.90
101.6 |
|
|
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4 3/8"
4 3/8" |
111.13
111.13 |
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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.
CAN/ULC-S770 does not apply to impermeably-faced (e.g., foil-faced) foam plastic insulation. A test method for determining LTTR values for impermeably faced foam plastic insulation is currently under development. Until such a test is available, Atlas has chosen to establish an interim LTTR value for Supreme based on LTTR test experience with permeably-faced products. Atlas recommends multi-layering when desired insulation thicknesses are greater than 2.7".
1"=25.4mm | | |
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