Apply sealant to underside of base and secure base with roofing nails.
Install metal roof over electric riser.
Wrap flashing around electrical mast and close by crimping stainless steel clips supplied.
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.
In a standing seam roof long single panels run vertically all the way from the eave to the ridge.
Next use 1 inch nails to secure some metal edging to the perimeter of the roof.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
Cut flashing opening to appropriate size for pipe.
Then cover the entire roof with a layer of insulation and secure it with a staple gun.
You also need to add.
Before you install metal roofing repair any damage to the wood under the shingles.
Apply shingles up to lower edge of electrical mast.
Install the roofing screws vertically along each rib in the panel.