Technical Document Details Proper Steps for Applying Foam Insulation On, Around Plastic Pipes

A new technical document that addresses techniques for the safe and proper use of spray polyurethane foam insulation on and around plastic pressure pipe materials has been published by the Plastics Pipe Institute, Inc. with input from the Spray Polyurethane Foam Alliance.

Prepared by PPI’s Building & Construction Division, PPI TN-69 Recommendations when Applying Spray Polyurethane Foam Insulation on and around Plastic Pressure Pipes & Fittings discusses the proper application of spray polyurethane foam insulation to avoid damage due to heat generated by the foam. Pipe and fitting materials include CPVC, PEX, PEX/AL/PEX, PE-RT, PP-R, PP-RCT, PSU, PPS, PPSU, and PVDF.

PPI and SPFA recommend that when there are plastic pipes and fittings in a wall, ceiling or floor cavity, the SPF installer should apply one layer of foam until it touches the pipe but does not encase the pipe. SPF installers should let the first layer of foam cure for a sufficient amount of time while heat is released from the foam and the pipe remains partially exposed before installing the second layer of foam. These procedures are described in detail within PPI TN-69.

Plastic pressure pipes and fittings are commonly used in applications such as hot- and cold-water plumbing, fire protection and hydronic heating and cooling systems, including radiant distribution systems. In certain instances, pipes and fittings are installed inside areas that must be insulated, such as within a ceiling or wall cavity. In other installations, the pipes and fittings themselves must be insulated to reduce the transfer of heat through the pipe wall.

Access the full content of PPI TN-69 at plasticpipe.org/common/Uploaded%20files/Technical/TN-69/PPI%20TN-69.pdf.