Installing Rigid Foam Insulation On Roof

Unroll roofing felt to cover the plywood on the roof and nail it in place.

Installing rigid foam insulation on roof.

All foam boards absorb water vapor. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. 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.

Rigid foam offers tremendous boost to a home or office s r value. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. To install measure the foam insulation panels to the roof s dimensions. 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. The plywood was fastened through the rigid foam to the rafters with long screws. It will degrade its r value. 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. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation. How to put rigid foam insulation on the roof before putting on shingles 1. Keep foam board insulation away from direct sunlight prior to installation.

Cover the insulation with a vapor barrier before you install it. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling. Remove existing roofing and non adhered underlayment to expose roof sheathing.