How to install metal roofing over shingles - youtube with pictures
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I am installing a metal roof on a single wide trailer it has shingles on it i plan to remove and lay metal on the plywood i have been told i must use 2×4 perlins are they necessary also the roof has a vent that runs the length of the trailer i plan to remove it as well and run the metal over it is that acceptable Fasten the shingles to the roof using the nail clips designed specifically for metal shingles. 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.
The industry standard for underlayment is often thought of as felt paper (tar paper) but there are also many newer synthetic underlayments that are designed to work well with metal roofing.
The first is running new underlayment over an existing shingle roof, thus covering the old roof. Venting—the eaves to vent the roof, holes are cut in the old roof above the soffit, which pulls air through the soffit vents underneath. Every case must be considered individually and there are some differences based upon the type of metal roof that is being installed but this is done on a regular basis with no ill effects. Then, cover the entire roof with a layer of insulation, and secure it with a staple gun.
