How To Install Metal Roofing Over Uneven Surfaces

Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof.

How to install metal roofing over uneven surfaces. Errors here can be the result of. Before you install metal roofing repair any damage to the wood under the shingles. In a standing seam roof long single panels run vertically all the way from the eave to the ridge. Install the roofing screws vertically along each rib in the panel.

Try to space the screws about 12 inches apart down the entire piece of metal. Penetrations in metal leak. My simple gable roof is built with trusses covered by osb then underlayment then 2x4 strapping purlins. The top chords of some of the trusses seem to be slightly bowed because if i lay a straightedge from peak to eave along some of those lines one or more of the purlins is up to 1 2 higher than the others.

And for any exposed fasteners try to avoid over tightening them. The roof has a 4 12 pitch and covers a 20 width and 48 length. But metal doesn t leak. Next use 1 inch nails to secure some metal edging to the perimeter of the roof.

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. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Moreover try to ensure that the screws are all aligned evenly. You will use metal roofing screws to secure the metal panels to the sheathing.

One of the single largest reasons for metal roof leaks and prolonged roof maintenance is poorly installed roofing fasteners and faulty sealing washers. Place the first screw. If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel.