Installing Rigid Foam Insulation On Roof

Cover the insulation with a vapor barrier before you install it.

Installing rigid foam insulation on roof.

This type of insulated roof assembly limits thermal bridging through rafters. It will degrade its r value. Nail metal flashing along the edges of the. All foam boards absorb water vapor.

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. How to put rigid foam insulation on the roof before putting on shingles 1. 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.

Remove existing roofing and non adhered underlayment to expose roof sheathing. 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. Keep foam board insulation away from direct sunlight prior to installation.

Install 1 by 3 furring strips over the insulation panels on top of each stud. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best.

The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling. Rigid foam offers tremendous boost to a home or office s r value. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor.