Let’s begin with one simple rule for people who want to install metal roofing. If you cannot easily walk on the roof because it is too steep, call a professional. Now that the rule is out of the way, if you have a building that requires a metal roof but the professional bids are too high, here’s how to do it.
Gather the proper tools. These include a measuring tape, a chalk line with plenty of chalk, a good drill, a sturdy extension ladder and a good, sturdy step ladder, pound of inch roofing nails, metal roofing screws, metal snips, and a cloth nail bag to hold the nails and screws.
Using the tape measure the roof’s height adding the desired overhang, generally two to four inches. Make numerous measurements keeping in mind the handy man’s mantra “measure twice, cut once.” Then measure the roof’s length and height on both sides to determine how much metal edging to add. Bring these measurements to the selected roofing supply company. They will tell you how much roofing is needed. Remember that between 3 and 6 inches of unblocked air flow is needed between layers.
Although it is not necessary to remove the old roof before laying down a metal roof, it is best. Remove the old shingles with a pitch fork, roofing shovel, or roofing pliers. Then lay down 30 pound tar paper which is the base for the new roof. If there is only one layer of shingles on the old roof, lay down 1″x4″x building length pine wood boards screwed onto the old shingles. Once the roof is prepared the metal roof edging can be applied.
Start placing the metal sheets running from top to bottom. They are screwed into the wood slats, using a screw every two feet on both sides of the sheet. Each sheet overlaps the last. When you reach the edge cut the last metal sheet so it is just past the edge of the roof.
Once the sheets are applied to both sides of the roof apply the metal trim along the edges at the sides of the roof. Also apply it at the peak, first scoring it in the middle so it can be bent over the peak.