Rigid Foam Roof Insulation Installation

They keep your home at a comfortable temperature without the need to crank your heat.

Rigid foam roof insulation installation.

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. A roof over a vented unconditioned attic does not need to include any insulation. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. Install it anywhere from the roof to the foundation.

You can even place it under the foundation slab. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. Exterior rigid foam improves air tightness adds r value reduces the chance of condensation in wall cavities and greatly reduces thermal bridging through studs. 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. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. Eps is the most vapor permeable of the three types.

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 rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. Rigid insulation is one of the best tools to reduce your energy costs. Foam board insulation is easy to use and is a great diy way to add some insulation.

Not only that foam sheathing will soon be mandated by code in some climate zones. Nail it around the edges with roofing nails. Remove existing roofing and non adhered underlayment to expose roof sheathing. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

At r 4 it also has the lowest r value per inch. It will degrade its r value. 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. To install measure the foam insulation panels to the roof s dimensions.

One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation. 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. Rigid foam insulation also known as insulating boards provide high r values.

All foam boards absorb water vapor.