Fitting Roof Insulation Board

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Fitting roof insulation board.

Depending how deep your rafter is you may be able to fit two layers of 100mm thick wool insulation. 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. 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. 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.

You can even place it under the foundation slab. Here is how we cut and fit our pir insulation to insulate the walls and roof of the house. With a warm roof the usual process is to split the insulation into two layers. 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.

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. Rigid insulation is one of the best tools to reduce your energy costs. They keep your home at a comfortable temperature without the need to crank your heat. Rigid foam insulation also known as insulating boards provide high r values.

Install it anywhere from the roof to the foundation. It s light weight provides ease of handling. With all the insulation board in place start at the top of the roof and fix the vapour barrier. Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market.