How To Build A Concrete Sink Form

Attach these to the base form with wood braces and screws.

How to build a concrete sink form.

Make sure that none of the steel touches the edge of the form as this will show through in the finished vanity. Molded edges can be rough like broken stone or smooth and rounded. Next build the second part of the form on top of this base. To leave room for these fixtures you can build recesses into the form as in the picture above.

After lots of research online this is the process i came up with including. I have been wanting to build some furniture out of concrete for a while and whilst doing a home renovation i got the opportunity to build a small sink for a bedroom ensuite. Set the expanded lath first and then the steel mesh on top of it. Fill up the rest of the form with concrete until it s flush with the form rails.

Making a large hole as in the above 2 sink options greatly increases the overall weakness of the concrete piece and stress cracks are common around sinks. I m building this second part of the form separate from the base to prevent excess debris falling into the pour area. The exception to this is the edges which often are made with a molded edge form available from a variety of sources or make your own rubber edge forms. Most countertop experts shy away from integral concrete sinks as a primary kitchen sink.

Because the soupy concrete would simply run down the sides of the sink molds without them add a second tier to the form by building a pair of melamine containment boxes around the sink molds. The other option is to simply use a knockout mold to create an opening for a stainless steel or porcelain sink. Concrete countertop molds are made by a variety of countertop mold manufacturers each offering a unique benefit. Using a sink mold sold here you can place the mold as part of your form work and pour the sink as part of the countertop this is a great option for overall strength of the concrete.

Some also have molds to make vessel sinks see bathroom products design catalog. How to build a gfrc concrete sink. If so the form you build must include cutouts for the sink itself and if necessary for a faucet.