Insulating Metal Roof No Sheathing

Insulated roof assemblies can be vented or unvented.

Insulating metal roof no sheathing. We ll add a vapor barrier so the moist air does not flow up through the insulation and condense on the roof. As a place where mold can quickly grow it is important to make sure that the paper liner is placed between the insulation and the sheathing. But a preinstalled membrane may be even more effective at removing condensation. Polyurethane spray foam metal roof insulation in order to add moisture barrier under metal roof you can spray the undersides of the roof by using a thick layer of polyurethane spray foam.

Lay the plywood perpendicular to the roof joists and fasten it in place using galvanized or stainless steel roofing nails. You can easily go through several sheets of insulation and know that they are secure. Modern metal roofs are expected to last 30 years or longer. The easiest and by far the quickest way to install metal roof insulation is with 1 inch staples.

The problem with using. There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam insulation above the roof sheathing. Insulating a new metal roof step 1 install plywood or oriented strand board osb to act as structural roof sheathing. Traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point.

The 3 foot roof panels will be anchored to purlins that run diagonal to the rafters. I would like to avoid installing sheathing if possible extra waste but i don t want to compromise the r value of the spray foam or to have the foam ooze out between the metal panels as it expands.