Rigid Foam Roof Insulation Installation

The bottom layer of a single ply membrane roofing system is the roof deck or substrate.

Rigid foam roof insulation installation.

There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam insulation above the roof sheathing. The benefits of adding a layer of rigid foam insulation to the exterior of walls and roofs are twofold. In other words rigid foam can be applied on walls foundations and roofs and works great for both retrofits and new constructions. Although gba has published many articles and videos on the topic we continue to receive frequent questions from readers asking how to install rigid foam sheathing on exterior walls so it s time to provide a primer on the topic.

Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. You can even place it under the foundation slab. Updated on july 20 2015. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

Rigid foam insulation installation prepare roof deck. Rigid insulation is one of the best tools to reduce your energy costs. To install measure the foam insulation panels to the roof s dimensions. They keep your home at a comfortable temperature without the need to crank your heat.

Rigid foam offers tremendous boost to a home or office s r value. The roof deck can be plywood metal concrete or wood planks. Nail it around the edges with roofing nails. Not only does it provide high r values but foam board insulation is also easy to install lightweight and can be used in any room of your home.

Insulated roof assemblies can be vented or unvented. What s the best way to install foam insulation on the outside of a wall. 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. First the foam will increase thermal performance by adding r value and minimizing thermal bridging.

Nailbase must be vented in high snow load areas. Rigid foam insulation also known as insulating boards provide high r values. The first step with roof installation is to prepare the roof deck by getting rid of all dirt dust and contaminants. Use a straight edge knife or utility knife to cut the.

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. Second the foam will keep the sheathing warm so moisture passing through the wall or roof will find no cold surfaces for condensation to occur. Install roofing underlayment flashing and cladding as per best practices. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation.