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What is Long Term Thermal Resistance (LTTR)Click here to learn more.

ACFoam Composite/GB
Long-Term Thermal Resistance*
THICKNESS
LTTR-VALUE
RSI
PCS/
PKG
METAL
DECK FLUTE SPANABILITY
IN
MM
IN
MM

1.3

30.02
6.3
1.11
17
2 5/8"
66.68
1.5
1.8
2.0
2.5
2.7
38.10
45.72
50.80
63.50
63.58
7.5
9.3
10.6
13.7
15.0
1.32
1.64
1.87
2.41
2.64
15
12
11
8
8
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
3.0
3.4
3.5
4.0
76.20
86.36
88.90
101.6
16.9
19.4
20.1
23.3
2.97
3.41
3.54
4.10
7
7
7
6
4 3/8"
4 3/8"
4 3/8"
4 3/8"
111.13
111.13
111.13
111.13
*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.