Installing Rigid Foam Insulation On Roof

Use a straight edge knife or utility knife to cut the panels to size.

Installing rigid foam insulation on roof.

Keep foam board insulation away from direct sunlight prior to installation. How to put rigid foam insulation on the roof before putting on shingles 1. Rigid foam offers tremendous boost to a home or office s r value. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation.

Remove existing roofing and non adhered underlayment to expose roof sheathing. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling. It will degrade its r value.

Cover the insulation with a vapor barrier before you install it. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. Nail metal flashing along the edges of the. To install measure the foam insulation panels to the roof s dimensions.

When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. This type of insulated roof assembly limits thermal bridging through rafters. Unroll roofing felt to cover the plywood on the roof and nail it in place. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. All foam boards absorb water vapor. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam.