How To Install Metal Roofing Over Uneven Surfaces

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How to install metal roofing over uneven surfaces.

Moreover try to ensure that the screws are all aligned evenly. 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. Then cover the entire roof with a layer of insulation and secure it with a staple gun. And for any exposed fasteners try to avoid over tightening them.

In a standing seam roof long single panels run vertically all the way from the eave to the ridge. Doesn t provide the flattest surface for the metal roofing to be installed over each course of shingles is about a 1 8 higher than the course just below it. My simple gable roof is built with trusses covered by osb then underlayment then 2x4 strapping purlins. The roof has a 4 12 pitch and covers a 20 width and 48 length.

Before you install metal roofing repair any damage to the wood under the shingles. 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. 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. Penetrations in metal leak.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Place the first screw. Install the roofing screws vertically along each rib in the panel. Leaking is probably the most common problem with metal roofing.

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. But metal doesn t leak. You will use metal roofing screws to secure the metal panels to the sheathing.