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Bathroom Sinks and Lavatories
Pipes required for roughing in the bathroom sink include hot and cold supply stubouts, shutoff valves, transition fittings, and possibly flexible tubing for above the shutoff valves. Air chambers may also be required.
If you are installing the bathroom sink in a back to back arrangement, little pipe is required. Since a sink rates low in fixture units, it should have little effect on the present drain's efficiency. Refer to the fixture unit chart in the Uniform Plumbing Code Book. This fixture can often be wet vented if it is within the critical distance. If not, it must be back vented in some areas.
Clearance from the side of a bathroom sink to a toilet tank or finished wall should be at least 4 inches while
the distance to a tub may be as little as two inches. There must also be a minimum of 21 inches from the front edge to a wall or fixture.
When cutting the capped supply lines to install your shut off valves, cut the 1/2" copper supply line at least 1 1/2 inches from the finished wall to allow for an escutcheon and shut off valve compression nut and ring.
1. Cut carefully and slowly so as not to compress the pipe with the cutter wheel or flatten the pipe. The compression ring and nut will only tighten on a round pipe.
2. Assemble the faucet according to the directions on the package.
3. Slip on the escutcheon, the coupling nut, the compression ring and the valve. Hold the valve outlet up and slide it over the compression ring.
4. Tighten down the coupling nut onto the valve using two crescent wrenches. It will usually squeak when it is properly seated.
5. Connect the trap to the drain body and the drain pipe.
6. When water pressure is restored, run water into the basin and check for any leaks.
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