To make the plumb.
Out of square roof.
A square simply refers to a 10 x 10 square of roofing.
Yup keep the overhang at the eave right unless your doing gutter trim and wont see it.
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How to square a metal roof preparation.
Make sure the walls are square.
For instance if the roof is 1550 square feet then it is 16 squares.
Place the square on.
This is simply 100 square feet of roof.
Out of square roof taking for granted for instance a 1 shingle overhang at the eave at the larger end i would start at the 11 point and mark 5 increments up to the 51 point then at the lesser end i would again start at the 11 point but this time mark 4 7 8 increments up to the 50 point then snap the guide lines and once these 9 courses are run just shingle as normal.
You can trim the rakes some and a standard rake trim has enough overlap to fudge some more just remember that when putting eave trim on and let it run long and trim to fit later.
To find the squares divide the overall roof area by 100 and then round up.
Lay out the rafter.
To determine if a roof is square.
Measuring for pattern rafters.
Roofs that are out of square can make the slots between shingle tabs look cockeyed.
Do this by measuring three feet out from the corner along one wall and.