Rigid Foam Insulation Roof Installation

Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing.

Rigid foam insulation roof installation.

R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. Rigid insulation is one of the best tools to reduce your energy costs.

Polyiso is an easy cost effective sustainable and energy efficient construction material. Put on your roofing safety harness and secure the safety rope to the top of the roof. Use a straight edge knife or utility knife to cut the panels to size. The ideal roof there s a reason polyiso rigid foam insulation is used in more than 70 of commercial roof construction as well as in many residential builds.

Install it anywhere from the roof to the foundation. All foam boards absorb water vapor. How to put rigid foam insulation on the roof before putting on shingles 1. It will degrade its r value.

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. Nail metal flashing along the edges of the. 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.

When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. You can even place it under the foundation slab. As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso. At r 4 it also has the lowest r value per inch.

Unroll roofing felt to cover the plywood on the roof and nail it in place. Rigid foam offers tremendous boost to a home or office s r value. Remove existing roofing and non adhered underlayment to expose roof sheathing. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling.

Rigid foam insulation also known as insulating boards provide high r values. They keep your home at a comfortable temperature without the need to crank your heat. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation. To install measure the foam insulation panels to the roof s dimensions.

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. Eps is the most vapor permeable of the three types.