How To Use Foam Insulation Over Roof

Spray foam insulation is a great product.

How to use foam insulation over roof.

The plywood was fastened through the rigid foam to the rafters with long screws. Firstly you can apply it directly onto the house s concrete walls with the help of a construction adhesive that will hold it in place. Insert 3 inch galvanized screws through the fastening plates. Use a drill to drive.

Homes insulated with it can be some of the most efficient and comfortable homes built. Insulating a metal shed roof with rigid foam can be done one of three ways by laying the board prior to applying the roof by removing the existing roof and installing new foam board or by insulating the existing metal roof from the inside. Build the rafters and secure the 5 8 inch cdx sheathing material. I ve been in plenty of these homes and can tell you that when spray foam is installed properly they outperform 99 of fiberglass batt insulated stick built homes.

Then used a standard styrofoam pan to create an airgap and use your spray foam over the top of that. Position the fastening plates over the insulation board. Leave a gap on both sides of the roof near the ridge so air can escape. I can also tell you that 73 of all statistics are made up on the spot so please don t ask for.

Place a ridge cap over the ridge to hide the gaps. Insert a plate every 2 square feet of insulation board. What if you used to zip wall sheathing on the route and put the zip wall facing into the attic space. To attach the insulation you can use screws with large washers a special adhesive made for adhering foam board insulation or for smaller pieces you can seal them in with caulk or spray foam.

After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. Polyurethane spray foam metal roof insulation in order to add moisture barrier under metal roof you can spray the undersides of the roof by using a thick layer of polyurethane spray foam. Nail it around the edges with roofing nails. On the roof side 30 pound fell paper and shingles.

Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line. Foam board insulation is easy to cut with a circular saw with a masonry blade or scored with a utility knife and snapped like you would drywall. There s two ways you can go about with foam board insulation. This type of insulated roof assembly limits thermal bridging through rafters.