Fitting Roof Insulation Board

Use a premade kit for this type of project.

Fitting roof insulation board.

Some types of thicker foam board insulation are available but they may need to be special ordered. This technique is the same for all rigid insulation such as kingsp. Here is how we cut and fit our pir insulation to insulate the walls and roof of the house. Rigid roof insulation board.

It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. It s light weight provides ease of handling. Available in both foam and rigid form choose the board type. With all the insulation board in place start at the top of the roof and fix the vapour barrier.

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. 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. Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside. Follow with a 2x4 frame wall and.

Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market. With a warm roof the usual process is to split the insulation into two layers. For new construction use rigid boards to insulate slabs and the outside of foundation walls. 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 how deep your rafter is you may be able to fit two layers of 100mm thick wool insulation. Foam board insulation is easy to use and is a great diy way to add some insulation. Attach the tongue and groove insulation boards to the concrete wall with adhesive. 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.