How To Insulate A Corrugated Roof

Not the cheapest option but easiest.

How to insulate a corrugated roof.

I want to insulate my garage roof to help stop the condensation. 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. Before doing any work with the metal roof insulation you should have it brought up onto the 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. Metal roof design vented atop additional wood sheathing weather barrier diagonal 1 x 4 wood strips. Make all cuts to the foam panels on the roof for more accurate cuts and quicker placement. Then filling any gaps left from fitting with expanding foam.

Insulating a new metal roof step 1 install plywood or oriented strand board osb to act as structural roof sheathing. Adjust the lap so that the last panel completes the coverage without making a cut lengthwise. Most of the roofing sheet companies will do you insulated sheets insulation thickness varies between 20mm and about 200. Cut panels on roof.

Step 2 pull the insulation so that it extends over the top plate of the wall. Install silver foil roofing insulation over the mesh. Pre drill the holes and use 10 by 2 in 25 4 by 5 1 cm screws with polycarbonate washers. This reduces the need to go up and down the ladder for tools pieces of insulation and making measurements.

Compared to the fiberglass batts this insulation is much better. Continue across the roof until it is completely covered lapping over the previous panel by at least 2 5 inches 6 4 cm minimum. Move onto next section. Leave gaps between panels.

Financially speaking this spray is a great option especially when you need to renovate your roof after the application. Fix some galvanised mesh to the rafters batens. If your replacing the roofing shets why not just order insulated sheets. The panel attachment in combination with the purlin or truss structure will secure the insulation.

I was thinking of getting some 50mm kingspan board cutting it and pushing it between the rafters. 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. Polyurethane spray foam metal roof insulation. Lay the insulation loosely over the purlin or truss structure the horizontal framework of beams helping to support the roof.