How To Install Insulation Under A Metal Roof

Layer building paper over the sheathing to help protect against moisture and leaks.

How to install insulation under a metal roof.

Leave at least 1 8 inch in between gaps to provide breathable space and avoid moisture. Install rigid foam insulation over the entire surface of the roof. You can easily go through several sheets of insulation and know that they are secure. It can lie down perfectly under the metal roofing without having to deal with the hassle.

Place the sheets close together but don t let them overlap. Install by using staples. Install plywood or oriented strand board osb to act as structural roof sheathing. Install with staples the easiest and by far the quickest way to install metal roof insulation is with 1 inch staples.

Another benefit of using staples is that they do not make a large hole when penetrating into the sheathing. But it is important to make sure that the paper liner is installed correctly between the sheathing and the insulation to prevent mold and mildew. Cover the sheets with duct tape but don t go overboard. Insulating a metal shed roof with rigid foam can be done one of three ways by laying the board prior to applying the roof by removing the existing roof and installing new foam board or by insulating the existing metal roof from the inside.

To install foil insulation roll it out parallel to the ridge and cut it with a utility knife starting at the drip edge and working your way up. Using staples will allow you to install the insulation easily and quickly. Once again this is used on cold roof construction. Use your neoprene washer head screws to secure the metal to the sheathing.

Lay the metal roof panels over the insulation. Use duct tape to seal the seams and further protect against moisture air leaks. According to the manufacturer s instructions install the metal roofing panels over the insulation. Take care the first piece is aligned precisely perpendicular square to the edge.

Lay the plywood perpendicular to the roof joists and. This type of underlayment is critical to a quality roof installation. Space the screws about 12 in 30 cm apart down the entire piece of metal. Make sure the product is designed to be used under metal.

It serves as a moisture barrier as well as a slip sheet. We recommend a polypropylene scrim reinforced underlayment made up of multiple layers. Follow the instructional guide to adhere to proper standards. Overlap each sheet.