Rigid Foam Roof Insulation Installation

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

Rigid foam roof insulation installation.

A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. Nail it around the edges with roofing nails. Use a straight edge knife or utility knife to cut the panels to size. The plywood was fastened through the rigid.

It will degrade its r value. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. They keep your home at a comfortable temperature without the need to crank your heat. Exterior rigid foam improves air tightness adds r value reduces the chance of condensation in wall cavities and greatly reduces thermal bridging through studs.

Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line. Install 1 by 3 furring strips over the insulation panels on top of each stud. Keep foam board insulation away from direct sunlight prior to installation. Rigid foam offers tremendous boost to a home or office s r value.

Remove existing roofing and non adhered underlayment to expose roof sheathing. All foam boards absorb water vapor. At r 4 it also has the lowest r value per inch. To install measure the foam insulation panels to the roof s dimensions.

Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. Install it anywhere from the roof to the foundation. All three types of rigid foam insulation expanded polystyrene eps extruded polystyrene xps and polyisocyanurate are suitable for use on the exterior of walls and roofs though they do not perform equally. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

A roof over a vented unconditioned attic does not need to include any insulation. Rigid foam insulation also known as insulating boards provide high r values. This type of insulated roof assembly limits thermal bridging through rafters after installing several layers of rigid foam above the roof sheathing. Cover the insulation with a vapor barrier before you install it.

Foam board insulation is easy to use and is a great diy way to add some insulation. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. Not only that foam sheathing will soon be mandated by code in some climate zones.

Eps is the most vapor permeable of the three types.