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Knockouts for Sinks and Faucets

On most countertop projects, you'll need to form knockouts in the countertops for installation of sinks and faucet stems. Since these holes are literally cast in concrete, they must be precise and properly positioned.

Closeup of a faucet knockout

Smoothing foam with a disc.

Concrete Countertop Institute in Raleigh, NC.

Concrete Countertop Institute in Raleigh, NC.

Although you can fabricate your own knockout forms for faucets from such materials as PVC pipe, rubber, or foam, you can save time by purchasing ready-made polyurethane or rubber knockouts in a depth to match the countertop thickness. You can also find precision-cut polyurethane templates for sink knockouts. They come in various shapes and sizes to match the dimensions of popular sink brands, such as Elkay, Kohler, and American Standard. Sources for these products include Granite City Tools concrete countertop division and Cheng Concrete Exchange. Girard notes, however, that premade sink-hole templates are normally not available for high-end or custom sinks. In that case, youll need to make your own.

Buying tips: If you're going to be casting a concrete countertop, why not cast a concrete sink as well for a more unified appearance? Rhodes has designed four fiberglass sink molds for precasting integral vanity, kitchen, and utility sinks. He says that each mold can be reused many times and comes with a rubber knockout for the drain hole.

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