Metal Roof Over Shingles Furring Strips

Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging.

Metal roof over shingles furring strips.

Screw fasten the purlins using fasteners directly screwed into the trusses or rafters. 3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof. If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch. As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

If talking metal shingles then putting them over existing asphalt shingles would be basically the same approach as putting on a second layer of asphalt shingles same issues same technique basically except they fasten a bit different and firring strips would generally not be used in my experience of seeing it done not that i would generally ever second layer with metal myself. Secure them to the roof with wood screws at every 4 to 6 inches. This should then be followed up with galvanized steel hat channel preferred method or 1 x 2 furring strips. This is by far the most common way to install a metal roof.

Place corner pieces where panels will meet bends at the edge of the roofing. Step 5 install metal sheets. Or installing the new metal roofing over furring strips 1 x 3s or similar will raise the metal and provide a ventilating air pocket between layers. Some jurisdictions may require full tear off whenever a new roof is installed.

They are compatible with many different kinds of synthetic underlayment. Install the slat board as described above. Bend the metal edging to your needs if necessary and fasten it to the roof with nails at every 4 to 6 inches. Step 4 install edging.

For those that are going it alone it is a good idea to get in contact with a roofing expert first. Make sure to consult local building codes before having a metal roof installed directly over old shingles. The furring strips are 1x4 pine boards. If you opt to put the metal roof atop current roof shingles it needs to be done in combination with a synthetic underlayment recommended.

Spacing of furring strips for metal roof when installing a metal roof over an existing roof insulate the spaces between the wood strips with rigid insulation to prevent condensation before. 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.