Fitting Roof Insulation Board

Batts between rafters in would require adding ventilation between the insulation roof deck.

Fitting 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. Foam board insulation is easy to use and is a great diy way to add some insulation. The bottom of the insulated plasterboard should meet the floor level of the roof space. Here is how we cut and fit our pir insulation to insulate the walls and roof of the house.

Rigid roof insulation board. In this case simply lay the insulation between the purlins. Fitting the insulated plasterboard. With a warm roof the usual process is to split the insulation into two layers.

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. It s light weight provides ease of handling. Use a chalk box to snap chalk lines on the roof deck. 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. After cutting the plasterboard to width so that it fits between horizontal centres of rafters screw the insulated plasterboard to the rafters. Stagger the joints to. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

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. Install it anywhere from the roof to the foundation. Butt the ends of the boards up together. Align the insulation boards with the chalk lines and lay them onto the deck.

Make sure that the insulation you are using is the same thickness so that the metal roof will fit better. You can even place it under the foundation slab. One of the more popular methods of placing metal roofing on a home is to lay down purlins across the existing shingles. Some types of thicker foam board insulation are available but they may need to be special ordered.