Installing Rigid Insulation On Roof

This type of insulated roof assembly limits thermal bridging through rafters.

Installing rigid 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. Second the foam will keep the sheathing warm so moisture passing through the wall or roof will find no cold surfaces for condensation to occur. Rigid foam offers tremendous boost to a home or office s r value. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best.

Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. Depending on the depth of your ceiling look into the various sizes available. 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. Use a straight edge knife or utility knife to cut the panels to size. You can easily install several sheets of the insulation in only a few minutes without worrying about the security. First the foam will increase thermal performance by adding r value and minimizing thermal bridging.

Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. Installing rigid foam insulation there s two ways you can go about with foam board insulation. Nail metal flashing along the edges of the. 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. Depending on the height of your ceiling you may need to use a step ladder to install the foam. 2 inch foam will probably work fine however rigid foam insulation is available in various sizes. Put on your roofing safety harness and secure the safety rope to the top of the roof.

Install rigid insulation board in multiple layers with joints offset vertically and. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. Staples will also allow you to get a strong attachment without leaving a big hole yet easy to remove them when a repair is needed. Unroll roofing felt to cover the plywood on the roof and nail it in place.

Scope 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. The benefits of adding a layer of rigid foam insulation to the exterior of walls and roofs are twofold. Using staples will allow you to install the insulation easily and quickly.

By martin holladay april 3 2015. Once the roof demo was complete and the flat roof was cleared of any remaining debris some rotted 2x material around the perimeter of the roof was replaced.