Metal Roof Over Shingles Furring Strips

If trapped between the metal roofing and old roofing moisture can build up and cause mold and rot.

Metal roof over shingles furring strips. If talking strip metal roofing like standing or raised seam then i can t imaging getting an even final surface or proper fastening without firring strips not only because putting the metal right on the shingles gives no way to level out the uneveness of the old shingles but also the underlying shingloes and underlayment will get awful hot. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. But roofers can install a vented metal roof that eliminates this potential problem. 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.

This should then be followed up with galvanized steel hat channel preferred method or 1 x 2 furring strips. If you opt to put the metal roof atop current roof shingles it needs to be done in combination with a synthetic underlayment recommended. To make clear to readers if firring strips battens are used this should be located under the firring strips so the ventilation airspace is right under the metal where condensation is most likely to occur and to keep any roof boot flashing leakage running off over the top of the water barrier from contacting and corroding the underside of the. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.

This is by far the most common way to install a metal roof. Install the slat board as described above. Metal roofing is also available in the form of shingles. Furring strips are required if you plan to place a metal roof on top of existing shingles.

Step 5 install metal sheets. 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. The furring strips are 1x4 pine boards. Screw fasten the purlins using fasteners directly screwed into the trusses or rafters.

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. 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. Bend the metal edging to your needs if necessary and fasten it to the roof with nails at every 4 to 6 inches. Secure them to the roof with wood screws at every 4 to 6 inches.