Installing Rigid Foam Insulation On Roof

To install measure the foam insulation panels to the roof s dimensions.

Installing rigid foam insulation on roof.

Rigid foam offers tremendous boost to a home or office s r value. Cover the insulation with a vapor barrier before you install it. Nail metal flashing along the edges of the. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

Put on your roofing safety harness and secure the safety rope to the top of the roof. Install 1 by 3 furring strips over the insulation panels on top of each stud. Unroll roofing felt to cover the plywood on the roof and nail it in place. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing.

Keep foam board insulation away from direct sunlight prior to installation. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. This type of insulated roof assembly limits thermal bridging through rafters.

Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. 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. Remove existing roofing and non adhered underlayment to expose roof sheathing.

A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. It will degrade its r value. The plywood was fastened through the rigid foam to the rafters with long screws.