How To Insulate A Corrugated Roof

Polyurethane spray foam metal roof insulation.

How to insulate a corrugated roof. Insulating a new metal roof step 1 install plywood or oriented strand board osb to act as structural roof sheathing. This reduces the need to go up and down the ladder for tools pieces of insulation and making measurements. Metal roof design vented atop additional wood sheathing weather barrier diagonal 1 x 4 wood strips. It is a corrugated asbestos roof with wooden joists holding it up.

I think i would prefer to fit whole sheets of celotex type insulation to the underside of the roof joists rather than in between. Continue across the roof until it is completely covered lapping over the previous panel by at least 2 5 inches 6 4 cm minimum. Financially speaking this spray is a great option especially when you need to renovate your roof after the application. Install silver foil roofing insulation over the mesh.

If your replacing the roofing shets why not just order insulated sheets. Move onto next section. Lay the plywood perpendicular to the roof joists and fasten it in place using galvanized or stainless steel roofing nails. Adjust the lap so that the last panel completes the coverage without making a cut lengthwise.

Then filling any gaps left from fitting with expanding foam. Most of the roofing sheet companies will do you insulated sheets insulation thickness varies between 20mm and about 200. I was thinking of getting some 50mm kingspan board cutting it and pushing it between the rafters. Not the cheapest option but easiest.

The spray can be basically applied on top or bottom of the metal roofing surfaces. Mesh stops the insulation from sagging. Leave gaps between panels. Cut panels on roof.

This way you ll hopefully leave a good vent space between the insulation and the corrugated sheets the sheet metal itself will be stone cold and will attract condensation which will need to be vented to keep it and the joists dry. From bottom to top of roof system wood sheathing slats vapor barrier rigid foam insulation 3 x 1 or 2 x 2 rigid foam insulation wood sheathing self adhered membrane corrugated metal roofing. I want to insulate my garage roof to help stop the condensation. Lay the insulation loosely over the purlin or truss structure the horizontal framework of beams helping to support the roof.

Fix some galvanised mesh to the rafters batens. Step 2 pull the insulation so that it extends over the top plate of the wall. Make all cuts to the foam panels on the roof for more accurate cuts and quicker placement. The panel attachment in combination with the purlin or truss structure will secure the insulation.