How to Build a Garden Fountain: Step-by-Step Instructions and Pictures
by Jeff Gorton
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2. Drive 1/2-in. sheet metal screws through the flashing at 8-in. intervals to secure it to the plywood. Line the flashing with a 60-in. length of foam sill sealer. To make a flush seam, cut through both thicknesses of foam with a utility knife where they overlap.