Fitting Roof Insulation Board

Rigid insulation is one of the best tools to reduce your energy costs.

Fitting roof insulation board.

Composed of a closed cell polyisocyanurate foam core bonded in the foaming process to 1 2 thick duraboard an expanded perlite mineral aggregate board on one side and a fiber glass reinforced facer on the other. Insulation cover boards training and education take advantage of industry leading training and education though care the center for the advancement of roofing excellence. Rigid foam insulation also known as insulating boards provide high r values. Before fitting any insulation to the sides of a pitched roof space any repairs to the roof should be completed once the insulation is in place it will be harder to spot any leaks inside the roof and any leaks will soak the insulation itself.

If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. It s light weight provides ease of handling. This technique is the same for all rigid insulation such as kingsp. Depending how deep your rafter is you may be able to fit two layers of 100mm thick wool insulation.

Depending on the specifics of the roof it may be possible to fully fill the rafter depth or in most cases leave a 25mm or 50mm air gap between the top face of the insulation and the. They keep your home at a comfortable temperature without the need to crank your heat. With a warm roof the usual process is to split the insulation into two layers. Here is how we cut and fit our pir insulation to insulate the walls and roof of the house.

Hack n stack sealed foam board between the rafters would be better since it s at least an air impermeable insulation but even that would require a vent gap below the roof deck to meet code and you d still be under r38 on that 2x6 rafters unless you fattened it out per holladay s recommendation. Make sure the insulation is 50mm below the actual roof which can be done using the battens as your measuring gauge for the breathable area between the roof and the insulating material. Install it anywhere from the roof to the foundation. You can even place it under the foundation slab.