Next use 1 inch nails to secure some metal edging to the perimeter of the roof.
Install metal roof over electric riser.
Then cover the entire roof with a layer of insulation and secure it with a staple gun.
In a standing seam roof long single panels run vertically all the way from the eave to the ridge.
Cut flashing opening to appropriate size for pipe.
You also need to add.
Apply shingles up to lower edge of electrical mast.
Apply sealant to underside of base and secure base with roofing nails.
When installing a metal roof over an existing roof insulate the spaces between the wood strips with rigid insulation to prevent condensation before installing the roofing.
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.
Wrap flashing around electrical mast and close by crimping stainless steel clips supplied.
Metal roofing 101 diy steel roofing installation over shingles subscribe.
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.