Hooking Up a Second Sink
If you're going to install a second sink in your bath, you'll save time and money if it's placed next to the existing lav. This means you won't have to cut into the wall when making the drainage hookup. The centers of the two drains should be no farther than 30 inches apart. And if the vanity tops are going to be installed at different heights, the new sink should be no more than 6 inches higher than the existing sink. If you choose to hire a plumber to do the work, the process is straightforward. Get at least two estimates and check licenses, insurance, and references. It shouldn't take more than a day to extend the waste and supply lines and hook up the sink if everything is ready for the installation. Although the work is all out in the open, you should be confident of your plumbing skills in order to take on this project yourself. Here's an overview of the steps involved: After shutting off the water, install new T-fittings and run supply lines to the new sink. Adapt the existing drain by removing its tailpiece and inserting a slip-joint T-fitting above the trap. Connect this to the drain hole of both lavs with a tailpiece and a 90-degree slip-joint elbow under the new lav and a tailpiece at the existing bowl. The drainpipe from the new sink should slope 1/4 inch for every foot in length. This slope will evacuate the sink quickly but keep water from being suctioned out of the trap. Check the local building code to determine if a separate vent is required for the new sink. In many cases, you can extend existing supply and drain lines if the distance from the vent is less than the maximum distance allowed by the building code. If you do have to add a vent, seek advice from a pro.
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