The flimsy particleboard bottoms in most kitchen and bathroom sink bases are often swollen and moldy from leaks. The best fix is to cut them out and replace them.
By the DIY experts of The Family Handyman Magazine:September 2011
Drill a 3/4-in. hole in each corner of the traced cutout line. Then run your jigsaw along
the line. Remove the old, swollen floor.
Predrill holes around the perimeter using a countersink bit. Then install brass-colored
Let’s face it—it’s easy to get water on
the floor of your sink base cabinet.
We’ll never understand why cabinetmakers
use particleboard for the base,
but they do. And once it starts swelling,
your only option is to replace it.
But you don’t have to cut out the
entire bottom. Here’s an easier way to
install a new sink base bottom.
Remove the drain lines (and garbage
disposer, if there is one) to get
maneuvering room. Then trace a cutting
line about 3 in. in from all four
edges. Then cut out the middle section
of the swollen sink base with a
jigsaw (Photo 1). Next, cut a piece of
1/2-in. plywood to the interior size of
the sink base. Cut slots for the water
supply tubes. Seal the edges and
face of the plywood with urethane
varnish. Then install the new plywood
floor and fasten it to the old
floor (Photo 2). Caulk around the edges
and pipes to prevent water from seeping
under the new floor. Finally, reattach the P-trap and garbage disposer.
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.
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