How To Install Rigid Foam Insulation On Roof

When installing a foil faced foam board insulation.

How to install rigid foam insulation on roof.

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. One of the best benefits of rigid foam insulation is that it offers excellent thermal resistance at around double that of traditional insulation. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. One way to limit this is to keep the sheathing warm by adding a layer of rigid foam insulation.

Nail it around the edges with roofing nails. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best. Rigid foam insulation offers a thermal resistance between r 5 and r 8 roughly twice that offered by traditional batt insulation. 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.

In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the. Insulated roof assemblies can be vented or unvented. 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. There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing.

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. Fiberglass insulated walls opened up in the middle of the winter are often covered in a thin layer of frost on the interior side of the wall sheathing. Cut panels on roof. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing.

There are typically 10 to a pack. Use a straight edge knife or utility knife to cut the panels to size. Make all cuts to the foam panels on the roof for more accurate cuts and quicker placement. Most foam board comes in 8 feet x 4 feet sheets although different sizes are available 8 feet x 2 feet is common.

To install measure the foam insulation panels to the roof s dimensions. In other words rigid foam can be applied on walls foundations and roofs and works great for both retrofits and new constructions. Rigid foam offers tremendous boost to a home or office s r value. This reduces the need to go up and down the ladder for tools pieces of insulation and making measurements.

Remove existing roofing and non adhered underlayment to expose roof sheathing. This article explains what rigid foam is and the benefits it offers.