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.
How to install steel roofing on a house.
In a standing seam roof long single panels run vertically all the way from the eave to the ridge.
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.
Next use 1 inch nails to secure some metal edging to the perimeter of the roof.
Then cover the entire roof with a layer of insulation and secure it with a staple gun.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
In many cases it makes sense to remove an old or dilapidated roof and install a metal roof that is better able to withstand the elements.
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Before you install metal roofing repair any damage to the wood under the shingles.
If you want to install steel over asphalt your best choice is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel.