Installing Rigid Foam Insulation On Roof

This type of insulated roof assembly limits thermal bridging through rafters.

Installing rigid foam insulation on roof.

The plywood was fastened through the rigid foam to the rafters with long screws. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. It will degrade its r value. All foam boards absorb water vapor.

Rigid foam offers tremendous boost to a home or office s r value. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. Cover the insulation with a vapor barrier before you install it. Remove existing roofing and non adhered underlayment to expose roof sheathing.

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation. Put on your roofing safety harness and secure the safety rope to the top of the roof. To install measure the foam insulation panels to the roof s dimensions.

Unroll roofing felt to cover the plywood on the roof and nail it in place. Use a straight edge knife or utility knife to cut the panels to size. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling.

Nail metal flashing along the edges of the. Install 1 by 3 furring strips over the insulation panels on top of each stud. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best.