Installing Rigid Foam Insulation On Roof

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

Installing rigid foam insulation on roof. Put on your roofing safety harness and secure the safety rope to the top of the roof. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. Rigid foam offers tremendous boost to a home or office s r value.

Cover the insulation with a vapor barrier before you install it. This type of insulated roof assembly limits thermal bridging through rafters. To install measure the foam insulation panels to the roof s dimensions. Remove existing roofing and non adhered underlayment to expose roof sheathing.

When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. It will degrade its r value. All foam boards absorb water vapor. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best.

The plywood was fastened through the rigid foam to the rafters with long screws. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. Unroll roofing felt to cover the plywood on the roof and nail it in place.

Keep foam board insulation away from direct sunlight prior to installation. Use a straight edge knife or utility knife to cut the panels to size. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation.