Materials.
24 C.F.R. § 3280.503
in effectEffective: 2024-07-01Materials used for insulation shall be of proven effectiveness and adequate durability to assure that required design conditions concerning thermal transmission are attained.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-24.xmlFetched: 7/26/2026
