Fitting Roof Insulation Board

This technique is the same for all rigid insulation such as kingsp.

Fitting roof insulation board.

For a basement remodeling project consider insulating basement walls with foam board. It s light weight provides ease of handling. 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. Rigid roof insulation 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. For new construction use rigid boards to insulate slabs and the outside of foundation walls. Available in both foam and rigid form choose the board type. With a warm roof the usual process is to split the insulation into two layers.

Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside. Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market. 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 comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

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 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. Some types of thicker foam board insulation are available but they may need to be special ordered.

Follow with a 2x4 frame wall and. 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. With all the insulation board in place start at the top of the roof and fix the vapour barrier. Here is how we cut and fit our pir insulation to insulate the walls and roof of the house.