We are working on freeze protection for an enclosed canopy which is also attached to the main building. There is no exposed metal pipe to the elements.
Per the AHJ, the only approved insulating process for metal sprinkler pipe is a thermal paint insulation.
I found the section for wrapped insulation that is allowed on non-metallic pipe by NFPA 13, but is there a section where wrapped insulation can be used on metal pipe?
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