PIMA announces transition to LTTR
The Polyisocyanurate Insulation Manufacturers Association (PIMA) has announced its transition dates for long-term thermal resistance (LTTR) to become the exclusive R-value measurement for permeable-faced polyisocyanurate products.
The LTTR transition date was July 1 in Canada, and Jan. 1, 2003, is the transition date in the United States. All permeable-faced polyisocyanurate roof insulation shipped by PIMA members after these dates will have LTTR R-values.
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