The roof of the structure will need standard roof sheathing.
How to install metal roofing home depot.
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.
Every 5 inches make a new mark until you get to the rop of the roof.
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Take care the first piece is aligned precisely perpendicular square to the edge.
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Repeat this on both sides of the roof.
Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Often this will be 1 2 thick cdx plywood.
So far this is the same process as for installing asphalt roofing.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
The main difference with steel is the need to use special nails which have washers mounted on them to seal.
Next you will want to apply roofing felt all across the sheathing.
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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.
Use the chalk line to snap a straight line vertically every 6 inches.
Always begin working at the point with the longest peak to eave distance.