Staple a layer of roofing felt covering the entire roof surface.
How to do metal roofing on a barn style roof.
Cut the patches to fit with a circular saw and screw them to the rafters using treated deck screws.
Cut out the damaged sections with a circular saw and pry them loose to remove them.
If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch.
Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging.
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Cut the edges to fit with a utility knife.
Set it flat on top of the sheathing underneath and insert a metal screw beginning on either side of the piece.
Build the roof as normal with the trim felt paper and metal flashing.
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Lay the first piece of metal roofing beginning in the bottom corner of the roof.
Then attach the metal roof material with screws make for roofing.
Place corner pieces where panels will meet bends at the edge of the roofing.
Then trim all edges of the roof with metal trim made for that purpose.