How To Use Foam Insulation Over Roof

Insulating a metal shed roof can keep a shed warmer even without a heat source.

How to use foam insulation over roof.

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. 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. Homes insulated with it can be some of the most efficient and comfortable homes built. Build the rafters and secure the 5 8 inch cdx sheathing material.

Then used a standard styrofoam pan to create an airgap and use your spray foam over the top of that. 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. 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. Spray foam insulation is a great product.

What if you used to zip wall sheathing on the route and put the zip wall facing into the attic space. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. Insert a plate every 2 square feet of insulation board. Position the fastening plates over the insulation board.

It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer. Insert 3 inch galvanized screws through the fastening plates. Nail it around the edges with roofing nails. 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.

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. This type of insulated roof assembly limits thermal bridging through rafters. 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. Place a ridge cap over the ridge to hide the gaps.

Leave a gap on both sides of the roof near the ridge so air can escape. Use a drill to drive. There s two ways you can go about with foam board insulation. On the roof side 30 pound fell paper and shingles.