Metal Roof Over Shingles Furring Strips

As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

Metal roof over shingles furring strips.

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. You also could install a corrugated through fastened metal roofing product and probably not have issues. Metal roofing is resistant to fire rot and termites. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.

Installing steel roofing over existing roofing materials is fairly simple. Manufacturers provide 30 year warranties on metal roofing products. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. 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.

If you hire a contractor they can explain all of this to you. They are compatible with many different kinds of synthetic underlayment. 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. This should then be followed up with galvanized steel hat channel preferred method or 1 x 2 furring strips.

Metal roofs depend on thin strips of wood known as furring to allow air to circulate and prevent rot. Some jurisdictions may require full tear off whenever a new roof is installed. This is by far the most common way to install a metal roof. Metal roofing is also available in the form of shingles.

Screw fasten the purlins using fasteners directly screwed into the trusses or rafters. If you opt to put the metal roof atop current roof shingles it needs to be done in combination with a synthetic underlayment recommended. 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. Use furring strips to build a slat board on the roof then mount the steel sheets to the slat board.