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Does code require water pipes in the attic to be insulated?
Saturday, August 24, 2019
The code requires that in “localities having a winter design temperature of 32º F (0º C) or lower as shown in Table R301.2(1) of this code, a water, soil or waste pipe shall not be installed outside the building, in exterior walls, in attics or crawl spaces, or in any other place subjected to freezing temperatures unless adequate provision is made to protect it from freezing by insulation or heat or both.” The dividing line in the map (shown below and detail at right) is at approximately Gainesville in Florida.
It’s in the Florida Plumbing Code at 305.4 and the Residential edition of the Florida Building Code at P2603.5. The citation is similar in the International Plumbing Code (IPC) and International Residential Code (IRC).
Hot water supply piping in an any attic (unconditioned space) is required to have minimum R-3 rated insulation by the Florida Energy Code (R403.5.3) and other codes based on the International Energy Code.
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