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LTTR Values: Tapered ACFoam® Composite/FB
| Marking | Thermal Average | Thickness | Slope |
|||
| - | in | mm | LTTR Value* | RSI** | per ft | percent |
| A B C D G H XX |
1.0 - 1.5 1.5 - 2.0 2.0 - 2.5 2.5 - 3.0 1.0 - 2.0 2.0 - 3.0 1.0 - 3.0 |
25 - 38 38 - 50 50 - 63 63 - 76 25 - 50 50 - 76 25 - 76 |
5.8 8.8 11.9 15.0 7.3 13.4 10.3 |
1.02 1.55 2.09 2.64 1.28 2.36 1.82 |
1/8" 1/8" 1/8" 1/8" 1/4" 1/4" 1/2" |
1% 1% 1% 1% 2% 2% 4% |
| *LTTR (long-term thermal resistance) values were determined in accordance with CAN/ULC-S770 and ASTM C 1289, Annex A1. All test samples were third-party selected and tested by an accredited material testing laboratory. The LTTR€ˆresults were reviewed and authorized by FM€ˆApprovals and certified by the PIMA€ˆQuality Mark Program. The R-value (1.39) for 1/2 in. perlite was provided by ASHRAE Handbook, Fundamentals. The R-value (.28) for 1/4 in. glass-mat gypsum board was provided by the glass-mat gypsum board manufacturer. The R-value (1.3) of 1/2 in. high density wood fiberboard was provided by the wood fiberboard manufacturer. Atlas recommends multi-layering when desired insulation thicknesses are greater than 2.7 in. ** RSI is the metric expression of R-value (m2 • K/W). |
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