Re: Advice on repairing metal patio awning
Are the leaks along seams or pinpoints? Pin points can be sealed with silicone or elastomeric caulk, elastomeric being the better of the two. Seams may also benefit from caulk, just depends on whether the seam has been damaged or not. Fasteners also benefit from a dab of caulk over the top, as the rubber grommet usually under such things can deteriorate over time.
Some of the dents and damage might be able to be pounded out with some blocks and hammer. Go slow, go gently. Hold a block on the flat side of the dent (over the "hole" of the dent ) and pound from the crown side of the dent, preferably through another block. This will do two things, stabilize the structure during the pounding and minimize further damage in the attempt of repair. If you have to get on top of the structure, get yourself a sheet of 1/2" or thicker plywood. The plywood will distribute your weight over a larger area, preventing further damage.
Once you've got all that together, you could also apply a "Snow Roof" type product, which is a thick, roller applied, material designed to seal small pin holes and leaks over an entire roof. The name brand product that is Snow Roof is white, which helps to reflect heat.
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