Remove a self-rimming cast iron sink
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Wedge the sink
Lay a flat board across the cabinet bottom. Then angle a 2x4 between the sink basins and the board. Tap it so it pushes up against the sink bottom.
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Cut and shim
Slice through the caulk with a utility knife if possible. If the caulk is too hard to cut, use a putty knife like a chisel to cut through the caulk. To lift the sink, tap in shims as you go. Then cut along the front edge of the sink and up the opposite side.
Self-rimming cast iron sinks are held in place with caulk. If you’re replacing the sink but keeping the laminate countertop, you’ll have to cut through the caulk. That can be tricky, especially if the caulk has hardened.
You’ll need lots of patience and these items: shims, a few feet of 2x4, a stiff putty knife and a heavy-duty solid-blade utility knife.
Wedge a 2x4 between the sink bottom and the floor of the cabinet to create slight upward force. Then cut the caulk. If the caulk is too hard to cut, hammer an old putty knife through the caulk, driving it toward the sink a section at a time.
Once you’ve cut the back corners, sides and front, tilt the sink up and cut the remaining caulk from the underside of the sink. Lift out the sink and clean the caulk residue from the laminate.