Space the screws about 12 in 30 cm apart down the entire piece of metal.
How to put on a metal roof yourself.
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.
Install the roofing screws vertically along each rib in the panel.
Now that we have put the one inch clip on the metal panel and cut the ribs back flush we can install the panel by clipping it into the offset cleat.
Slide the edge up through the offset cleat so that it is fulling engaged and flush along the edge.
Place the ridge cap over the roof.
Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 4 in 1 9 cm.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
In a standing seam roof long single panels run vertically all the way from the eave to the ridge.
Make sure that the panel is sitting back from the edge of the roof by half an inch.
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 line.
Use your neoprene washer head screws to secure the metal to the sheathing.
Take care the first piece is aligned precisely perpendicular square to the edge.
The ridge cap helps water to flow off of the roof.