Installing the Undermount Kitchen Sinks

Our contractor really didn’t want to install our sinks (hoping a countertop installer would do it) but he ended up with the task.

Kraus stainless steel apron sink
Kraus stainless steel apron sink
The Krauss KBU10 will be the prep sink. It also comes with a bottom grid and strainer.
The Krauss KBU10 will be the prep sink. It also comes with a bottom grid and strainer.

Both sinks are undermount varieties and so need to be installed before the countertops.

The 30-inch stainless steel farmhouse sink is supposed to fit in the cabinet upon which it sits.
The 30-inch stainless steel farmhouse sink is supposed to fit in the cabinet upon which it sits.

The farmhouse apron sink is sitting on battens screwed to the side of the cabinet to carry the weight of the sink.

The sink sits on two by four battens screwed into the cabinet.
The sink sits on two by four battens screwed into the cabinet.

The face of the cabinet had to be cut down to accommodate the 9-inch depth.  Our contractor was worried about this step, afraid he would mess up the cabinet.

The face of the sink cabinet was cut out to allow the farmhouse sink apron to protrude through.
The face of the sink cabinet was cut out to allow the farmhouse sink apron to protrude through.

The front of the sink is NOT supposed to rest on the front of the cabinet so a small (neat) gap is necessary.

The barest hint of a gap will be caulked once the countertop is in place.
The barest hint of a gap will be caulked once the countertop is in place.

Looks fine.  Now on to my  sink.

My sink has edges which could rest on two by fours screwed into the cabinet.
My sink has edges which could rest on two by fours screwed into the cabinet.

It also sits under the counter but is fully covered by the cabinet which does not need any facial surgery. Even though my sink is the smaller of the two it’s still huge and just fits into the space allotted.

The cabinet's corner braces were routed to allow the sink's edge to sit precisely at counter height.
The cabinet’s corner braces were routed to allow the sink’s edge to sit precisely at counter height.

The corner cabinet supports were routed to allow the sink to sit flush with the top.

Charlie crawled under the sink to photograph the sink edge resting on a 2 by 4 at the back of the cabinet.
Charlie crawled under the sink to photograph the sink edge resting on a 2 by 4 at the back of the cabinet.

Viewed from underneath the support pieces were screwed to the sides of the cabinet to hold the sink in place.

Waiting for the countertop.
Waiting for the countertop.

With both sinks installed we’re ready for the countertops to be installed and the details to make the kitchen useable to be finalized.

How do you tackle a project you’re hesitant to start?

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Author: Jo

Welcome to The Glade, where the second generation of renovations has just begun and the mania about our home, music and other passions fill our days and nights. We’re Charlie and Jo in the music world; Mary Jo and Charles to family; and JoJo and Charlie to each other. We are renovating a midcentury house in a Victorian historic district where we want to live there the rest of our lives. It's a 1946 house located in Maryland. We were married in this house. Thus far (pre-blog) we refinished cabinets, added a window seat (still working on the cushion), rearranged a wall in the guest house due to sink/vanity replacement, planted a vegetable garden, and other quick and not-so-quick fixes. So this latest zeal for construction is the result of my having lived here since 1997 and feeling a need to ready the house for the next chapter and beyond.

5 thoughts on “Installing the Undermount Kitchen Sinks”

    1. Hi Steve. I checked under the sink and it looks like the snug fit side to side, the friction of the sink on the 2 by 4 supports, and the weight of the countertop keep the sink from shifting front to back. Jo

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