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What is LTTR and why doesn’t it apply to foil faced products?

April 26, 2017doesn’t faced foil lttr products

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What is LTTR and why doesn’t it apply to foil faced products?

1 Answer

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10 Posted

Long Term Thermal Resistance (LTTR) is a method of determining the R-value of a product. LTTR values are determined in accordance with CAN/ULC-S770, which predicts a 15-year time-weighted average. This test method applies to permeable faced products. Therefore, it is not applicable to foil faced products, such as R-Matte Plus-3 or Thermasheath-3, which use the PIMA 101 conditioning methods and ASTM C518 measurement procedures.