Rigid Foam Roof Insulation Installation

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

Rigid foam roof insulation installation.

Use a straight edge knife or utility knife to cut the panels to size. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. Remove existing roofing and non adhered underlayment to expose roof sheathing. It will degrade its r value.

Keep foam board insulation away from direct sunlight prior to installation. 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. All foam boards absorb water vapor. 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. Not only that foam sheathing will soon be mandated by code in some climate zones. The plywood was fastened through the rigid. Exterior rigid foam improves air tightness adds r value reduces the chance of condensation in wall cavities and greatly reduces thermal bridging through studs.

Rigid foam offers tremendous boost to a home or office s r value. Rigid insulation is one of the best tools to reduce your energy costs. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

Install it anywhere from the roof to the foundation. Nail it around the edges with roofing nails. You can even place it under the foundation slab. 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. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. Eps is the most vapor permeable of the three types. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor.

Foam board insulation is easy to use and is a great diy way to add some insulation. At r 4 it also has the lowest r value per inch. 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. This type of insulated roof assembly limits thermal bridging through rafters after installing several layers of rigid foam above the roof sheathing.

One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation.