What is a LTTR (Long Term Thermal Rating)?
This is a rating system we use to see how insulation performs in the long term (over 2 years). Most standard testing is for the R-value immediately after it is installed. Do not be fooled by companies that give an R-rating for install date or even at 120 days. Ask what the LTTR is, this will give you the true value of the spray foam insulation that you are installing in your Calgary home.
