How to install metal roofing over existing shingles with different angle
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Most buildings are designed to support the heaviest roofing systems. On flat, even roofs, you can place the metal roofing directly on top. This will provide ventilation while protecting your new roof from the abrasive shingles.
It’s important to first inspect the plywood under the asphalt shingles to make sure it is in good condition.
Steel shingles weigh about 1/4 what asphalt shingles weigh and aluminum shingles weigh about 1/8. Methods of installing metal roofing on top of traditional shingle 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. Your metal trim will go along the roof's edges as well as the top ridge.
