Installing Rigid Foam Insulation On Roof

Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond.

Installing rigid foam insulation on roof.

One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation. Nail metal flashing along the edges of the. All foam boards absorb water vapor. Keep foam board insulation away from direct sunlight prior to installation.

Unroll roofing felt to cover the plywood on the roof and nail it in place. Put on your roofing safety harness and secure the safety rope to the top of the roof. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling. Use a straight edge knife or utility knife to cut the panels to size.

This type of insulated roof assembly limits thermal bridging through rafters. To install measure the foam insulation panels to the roof s dimensions. The plywood was fastened through the rigid foam to the rafters with long screws. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam.

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. Cover the insulation with a vapor barrier before you install it. 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. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. How to put rigid foam insulation on the roof before putting on shingles 1.