Insulation Board Under Metal Roofing

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.

Insulation board under metal roofing.

In this case simply lay the insulation between the purlins. 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. But a preinstalled membrane may be even more effective at removing condensation. Make sure that the insulation you are using is the same thickness so that the metal roof will fit better.

Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line. One of the more popular methods of placing metal roofing on a home is to lay down purlins across the existing shingles. 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. 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.

Foil insulation is a radiant barrier and it works by. Closed cell polyisocyanurate foam core. Both materials make a great physical barrier between the interior building and the metal roof. The problem with using.

The batts are located side to side on the rafter of the roof. Nail it around the edges with roofing nails. We ll add a vapor barrier so the moist air does not flow up through the insulation and condense on the roof.