Installing Rigid Foam Insulation On Roof

All foam boards absorb water vapor.

Installing rigid foam insulation on roof.

It will degrade its r value. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling.

Install 1 by 3 furring strips over the insulation panels on top of each stud. Use a straight edge knife or utility knife to cut the panels to size. Unroll roofing felt to cover the plywood on the roof and nail it in place. 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. Cover the insulation with a vapor barrier before you install it. Nail metal flashing along the edges of the. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best.

After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. 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. This type of insulated roof assembly limits thermal bridging through rafters.

Remove existing roofing and non adhered underlayment to expose roof sheathing. Rigid foam offers tremendous boost to a home or office s r value. To install measure the foam insulation panels to the roof s dimensions.