The Domsjo Double Bowl sink: it’s a beast, but it’s also a beauty. The sink is designed to be installed over the sink base, but it actually rests on the countertop to either side of the sink. The Domsjo Sink Base is nothing more than a standard sink base without the false drawer fronts and hardware.
Tip #1: Don’t assemble the sink base until you have your sink. The assembly instructions as well as the necessary horizontal bracing bars for the base cabinet actually come with the sink, not with the cabinet base.
(It’s IKEA’s ingenious way of keeping you on the ball with your assembly and installation.) Note: The horizontal bars are only for bracing the cabinet. They DO NOT support the sink in any way.
Domsjo Sink: Installation
Horizontal bracing bars underneath sink NOT supporting sink. 
