An undermount kitchen sink is a sink that is placed under the countertop.

The advantage of placing a sink under the countertop is that there are no seams or sealant visible at all. Because there are no extra edges, dirt will not be able to accumulate at the edge of the sink on the countertop.

The undermount installation of a sink or sink can be placed under the countertop in 2 different ways. The possibilities depend on the type of sink you have.

It is not always possible to place a sink under the countertop. With the following kitchen worktops it is not possible to place the sink under the kitchen worktop:

• Plastic Kitchen Countertops
• Wooden Kitchen Countertops
• Concrete kitchen Countertops

Which countertop/kitchen top does allow an undermount sink to be installed:

• Composite kitchen worktop
• Granite kitchen worktop
• Stainless Steel Kitchen worktop
• Solid Surface Kitchen worktop
• Ceramic Kitchen worktop
• Glass Kitchen worktop

Installing stainless steel sinks underneath

The rim of a stainless steel sink also called flange is placed under the countertop. The flange is glued with acid-free silicone glue and propped up before the glue cures. After the silicone glue hardens, you can use the sink. Make sure that the underside of the worktop and flange are completely clean and free of grease so that the acid-free silicone glue maintains its maximum strength.

Ceramic and other heavy undermount sinks

The weight of a ceramic sink is certainly already 20kg, when the sink is completely filled with water it will be up to 60kg. To support this weight properly, additional support is needed to place the sink undermount. This is done by mounting metal brackets under the sink. In addition, the ceramic sink will also be secured at the top with silicone glue to create watertightness and extra support.

It is best to install an undermount sink flush with the saw size of the kitchen worktop, however, a small overhang of the countertop is also common. In practice, composite countertops with a sink made from the same material and color and glued underneath are often used. Unfortunately, these composite sinks are not very sturdy and often break down. Because the size is often very different from a standard stainless steel sink, it cannot always be replaced. Therefore, we recommend that if you do purchase a composite sink, a "standard" size is made so that this will not be a problem in the future should it be replaced.

Assembly Instruction Video