- 1). Coat the inside of the piece of gutter that will be the bottom piece in the seam with gutter seal or silicone caulk. The bottom piece will be the miter, the end cap, or the run of gutter that is closest to the downspout.
- 2). Attach the two pieces of gutter together and press firmly on the seam to ensure that the sealant is distributed evenly. Secure the pieces together with pop rivets.
- 3). Apply additional sealant inside the gutter at the seam, pressing the sealant into the entire crevice. Pay special attention to the pop rivets or screws holding the pieces together.
- 4). Allow to dry completely. Drying time will vary depending on the type of sealant used. Then test the seam with a garden hose to be sure that it is properly sealed.
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