Insulation Board Under Metal Roofing

One of the more popular methods of placing metal roofing on a home is to lay down purlins across the existing shingles.

Insulation board under metal roofing.

Closed cell polyisocyanurate foam core. Nail it around the edges with roofing nails. There are two ways to do this put in firring nailing though nails are not used any more for this strips or purlins in steel frame construction on the roof to support it or place the metal roofing directly on a flat surface like foam insulation board or the roof sheathing with roof water barrier in the correct position in the layer. Foil insulation is a radiant barrier and it works by.

Make sure that the insulation you are using is the same thickness so that the metal roof will fit better. Foil insulation underlayment is recommended under a metal roof and in most cases the shiny side should be facing up but there s a catch. Foam board insulation is easy to cut with a circular saw with a masonry blade or scored with a utility knife and snapped like you would drywall. Fiberglass batts or glass mineral wool metal roof insulation the most common material used for an insulating metal roof is fiberglass batts or glass mineral wool.

To attach the insulation you can use screws with large washers a special adhesive made for adhering foam board insulation or for smaller pieces you can seal them in with caulk or spray foam. Provides high r value per inch in built up modified bitumen metal roof and single ply roof systems and utilizes an environmentally compliant blowing agent that provides high thermal insulation performance. We ll add a vapor barrier so the moist air does not flow up through the insulation and condense on the roof. But a preinstalled membrane may be even more effective at removing condensation.

The batts are located side to side on the rafter of the roof. In this case simply lay the insulation between the purlins. Traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point.