How To Install Metal Roofing Over Uneven Surfaces

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.

How to install metal roofing over uneven surfaces. 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. Before you install metal roofing repair any damage to the wood under the shingles. But metal doesn t leak. 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. My simple gable roof is built with trusses covered by osb then underlayment then 2x4 strapping purlins. Then cover the entire roof with a layer of insulation and secure it with a staple gun. 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.

Leaking is probably the most common problem with metal roofing. In a standing seam roof long single panels run vertically all the way from the eave to the ridge. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. 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.

Try to space the screws about 12 inches apart down the entire piece of metal. Errors here can be the result of. Next use 1 inch nails to secure some metal edging to the perimeter of the roof. Penetrations in metal leak.

Install the roofing screws vertically along each rib in the panel. 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. You will use metal roofing screws to secure the metal panels to the sheathing.