How To Fit Exterior Roof Insulation Boards

That said some gba readers install r 60 attic insulation and you re free to do that if you want.

How to fit exterior roof insulation boards. The illustration shows two layers of osb or plywood roof sheathing. Over the foam you will need something to nail the roofing to usually a solid sheet of plywood or osb. Make all cuts to the foam panels on the roof for more accurate cuts and quicker placement. Stagger the joints to ensure a uniform roof surface.

Unroll roofing felt to cover the plywood on the roof and nail it in place. This reduces the need to go up and down the ladder for tools pieces of insulation and making measurements. To save a step i would recommend using a nailbase panel foam preadhered to osb or sometimes plywood on one side only see photo facing page. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

More insulation on the exterior is good. But putting insulation above the roof sheathing is misguided if you have a vented attic. Instead of adding insulation above your roof sheathing put it on the attic floor where it belongs. A lower layer conventionally nailed to the rafters and an upper layer installed as a nailing surface for the roofing material on top of the rigid foam.

Align the insulation boards with the chalk lines and lay them onto the deck. Remove existing roofing and non adhered underlayment to expose roof sheathing. Installed on the roof exterior foam makes the living space below more comfortable and reduces the likelihood of ice dams. How to put rigid foam insulation on the roof before putting on shingles.

This technique is the same for all rigid insulation such as kingsp. Put on your roofing safety harness and secure the safety rope to the top of the roof. Cut panels on roof before doing any work with the metal roof insulation you should have it brought up onto the roof. Nail metal flashing along the edges of the roof line.

Butt the ends of the boards up together.