Insulation and soundproofing
Thermal Drift in Foam Insulation: Understanding R-Values in Insulation, Why They Change and Degrade Over Time
...LTTR) value.
LTTR: This is the R-value that foam insulation is expected to maintain over its service life, typically based on accelerated laboratory testing (like ASTM C1303 or CAN/ULC-S770) that estimates performance after five years, which is then used to predict a long-term average.
Significance: Building professio...
