Rigid Foam Roof Insulation Installation

Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance.

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. Rigid foam insulation also known as insulating boards provide high r values. Rigid foam insulation installation prepare roof deck. Install roofing underlayment flashing and cladding as per best practices.

There are at least two good reasons why this approach makes more sense than installing the insulation under 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. The benefits of adding a layer of rigid foam insulation to the exterior of walls and roofs are twofold. You can even place it under the foundation slab.

Nail it around the edges with roofing nails. The roof deck can be plywood metal concrete or wood planks. Insulated roof assemblies can be vented or unvented. Install these panels over wall or ceiling cavities including those filled with existing fiberglass batts to boost the r value and improve home comfort and efficiency.

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. Rigid foam insulation offers a thermal resistance between r 5 and r 8 roughly twice that offered by traditional batt insulation. Rigid foam offers tremendous boost to a home or office s r value. The bottom layer of a single ply membrane roofing system is the roof deck or substrate.

They keep your home at a comfortable temperature without the need to crank your heat. 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. 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. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

Nailbase must be vented in high snow load areas. Use a straight edge knife or utility knife to cut the. 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. The first step with roof installation is to prepare the roof deck by getting rid of all dirt dust and contaminants.

Install nailbase for cladding. Install it anywhere from the roof to the foundation. Rigid insulation is one of the best tools to reduce your energy costs.