Fitting Roof Insulation Board

Foam board insulation is easy to use and is a great diy way to add some insulation.

Fitting roof insulation board.

Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market. With all the insulation board in place start at the top of the roof and fix the vapour barrier. For a basement remodeling project consider insulating basement walls with foam board. 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.

It s light weight provides ease of handling. 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. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

Use a premade kit for this type of project. For new construction use rigid boards to insulate slabs and the outside of foundation walls. Follow with a 2x4 frame wall and. 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.

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. 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. 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. Available in both foam and rigid form choose the board type.

Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside. Some types of thicker foam board insulation are available but they may need to be special ordered. 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. This technique is the same for all rigid insulation such as kingsp.