Spray Foam On Top Of Metal Roof

A spray polyurethane roof can be installed over a leaking metal roof.

Spray foam on top of metal roof.

With building code compliance and sustainable building envelopes at the forefront in today s marketplace spray polyurethane foam insulation spf applied to single skin metal roof and wall panels is an alternative to insulated metal panels with a manufacture applied polyurethane foam core. This posting was excerpted from renovation 4th edition newly published by taunton press. Compared to the fiberglass batts this insulation is much better. Spf roofs are installed by spraying a liquid on the existing roof and allowing it to expand into a foam.

In new construction some sort of roof deck often metal must first be installed before the foam can be applied. In retrofit or re roof applications the foam can be applied directly to the existing roof in many cases. Spf insulation improves a building s energy efficiency and provides thermal air and vapor barrier capabilities. This process means that the foam can conform to all roof shapes and types even irregularly shaped roofs.

Financially speaking this spray is a great option especially when you need to renovate your roof after the application. Let s start with the foam side of the equation first. An open cell foam about 0 5 pound density is the most. Spray foam is a great fit for both new construction and retrofit applications.

Polyurethane spray foam metal roof insulation. Your metal roof expands when it s hot and contracts when it s cold. Can i apply spray foam insulation directly to the underside of a metal roof. We show you the spray foam installation process over a metal panel roof from start to finish.

After cleaning the existing roof the spf roof can be applied directly over asphalt shingles concrete metal and wood. The spray can be basically applied on top or bottom of the metal roofing surfaces. Since spray foam is monolithic and closed cell it will create a watertight barrier over the entire metal roof. An spf roof can also be quite durable when the polyurethane is sprayed with a special acrylic top coating that protects the foam against uv degradation.

For metal roofing it is fairly common to use architectural grade roofing without. The purpose of the requirement that rigid foam installed above roof sheathing meet certain minimum r values is to ensure that the roof sheathing stays warm enough during the winter to avoid moisture accumulation and possible sheathing rot. The gist of the discussion was the client had heard spray foam insulation will corrode the steel and void the warranty of the steel.