Install a sink below a granite countertop.
A granite counter is a common feature of modern kitchen designs. Sleek, hard and polishable on any edge, one of the benefits you derive from installing a granite countertop is the use of an undermount sink. Since the rim of the sink sits below the counter, rather than on top, you must install the sink so it holds firmly in place. With silicone adhesive, epoxy and sink clips, you can secure your sink in place.
Instructions
1. Clean the underside of the granite to ensure that it is free of dust or debris that could interfere with the bond of the sink and the adhesives. Allow the granite to dry completely before beginning.
2. Squeeze a line of silicone caulk directly from the tube onto the underside of the granite counter, surrounding the opening for the sink. Keep the line of caulk thin and without any breaks to ensure even coverage.
3. Line up the sink below the counter. Press it into place on the caulk. Hold it in place for a minute.
4. Place the two-by-four across the top of the granite, over the sink opening. Fasten one end of the C clamp through the sink's drain and the second end over the top of the two-by-four. This will hold the sink in place temporarily while the silicone hardens and you install the hardware.
5. Install the bolt stems of the sink mounting hardware by applying a dab of epoxy directly to the underside of the granite, next to the sink's rim, and pressing the bolt stem into place. Each sink will come with the required number of bolt stems for that size sink. Space the bolts evenly around the sink so that you have at least one bolt per side of the sink. For large sinks, install the bolts toward the corners of the sink for even hold. Wait 10 minutes for the epoxy to harden.
6. Install the rest of the sink's mounting hardware by applying a dab of epoxy onto the sink's rim, next to the bolt stems and pressing the mounting clips into the epoxy. Your sink should have as many mounting clips as bolt stems. Line them up properly next to the bolt stems so that they can attach to one another. Wait 10 minutes for the epoxy to harden. Attach the clips to the stems by tightening the bolts down with a wrench.
7. Allow the epoxy and silicone to harden overnight, then remove the two-by-four and C clamp from the sink and counter. Do not install the sink's drain or waste pipe until this time has passed, or the weight of the pipe could pull the sink away from the counter.
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