Rigid Foam Insulation Roof Installation

Use a straight edge knife or utility knife to cut the panels to size.

Rigid foam insulation roof installation.

Unroll roofing felt to cover the plywood on the roof and nail it in place. 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. It will degrade its r value. As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso.

Nail metal flashing along the edges of the. Eps is the most vapor permeable of the three types. 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. Rigid insulation is one of the best tools to reduce your energy costs.

If you want to install rigid foam above your roof sheathing in climate zone 3 then 1 2 inch of rigid foam board is not ideal this rigid foam layer needs a minimum r value of r 5 and that s impossible with 1 2 inch of foam. Use 2 1 2 inch deck screws to drive the furring strips into the foam and the wood framing beyond. Keep foam board insulation away from direct sunlight prior to installation. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

Install it anywhere from the roof to the foundation. All foam boards absorb water vapor. Put on your roofing safety harness and secure the safety rope to the top of the roof. Install 1 by 3 furring strips over the insulation panels on top of each stud.

When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. You can even place it under the foundation slab. Rigid foam offers tremendous boost to a home or office s r value.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Polyiso is an easy cost effective sustainable and energy efficient construction material. They keep your home at a comfortable temperature without the need to crank your heat. How to put rigid foam insulation on the roof before putting on shingles 1.

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. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. The furring strips should run vertically from floor to ceiling or from eaves to rafters if you are installing them on a sloped ceiling. To install measure the foam insulation panels to the roof s dimensions.

At r 4 it also has the lowest r value per inch. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation.