Foam Roofing Goes On Top Of

There are three options for an air control membrane installed on top of the roof sheathing these are listed relative to air control and temporary back up water control performance.

Foam roofing goes on top of. From what i ve learned here seal the seams of the osb roof sheathing with zip system tape to create an air tight barrier. Make sure all seams are properly lapped. Good non adhered roof underlayment made air tight with taped seams and air tight connections to the air control of adjacent assemblies. Spray foam roofing spf is an excellent choice for a flat roof because of its insulation properties and seamlessness.

While spf roofing is not the most known type of roofing material the technology has been around since the early 1960s for industrial commercial. Polyurethane foam roofing consists of a protective coat layer and a foam layer on top of a substrate. The usual application of spray foam is to repair and re invigorate an existing roof by removing the saturated areas replacing with like materials and then spraying foam over top of the entire roof. Recoating your foam roof will cost about 25 of the original cost.

Put down roof felt. Create an unvented roof putting foam on top of the sheathing. If small holes to the foam roof occur because of equipment or damage from people walking on it you can usually calk it to prevent it from spreading. Put full sheets of 2 foam on top of the sheathing and felt tacked in place.

After cleaning the existing roof the spf roof can be applied directly over asphalt shingles concrete metal and wood. Foam roofing is applied using a liquid chemical that expands to over 20 30 times the volume of the original liquid. Spf roofs are installed by spraying a liquid on the existing roof and allowing it to expand into a foam. It makes the most sense and preforms the best under most conditions.

One of the most efficient and popular methods though is to install rigid foam insulation on top of roof sheathing. A second recoat is generally necessary only 25 years after the roof s installation. My roofing is steel and is designed to be mounted on battens purlins. Most home and business owners opt for rigid foam on top of roof sheathing because it makes the most sense and it s an eco friendly solution.

The foil insulation goes on top of the moisture barrier followed by the roof covering. It has a long lifespan if its been installed correctly which takes skill and special equipment for the project.