I plan to build a knee wall at the end of a tub/shower alcove. On top
of the knee wall I plan to put a black walnut cap. The knee wall is 2
by 4 construction covered in cement board. The black walnut will be
polyurethaned then attached to the knee subwall. A friend suggested
"gluing" it down with silicone. Any thoughts on that suggestion.
Probably a good idea so if you ever have to or want to replace it, it can be
easily removed. Couple of thoughts. Be sure you seal that cap with the
poly all around and be sure it's thoroughly dry before any silicone is
applied to it.
The silicone caulk takes space, think of it as a thick glue so unless you
can apply a lot of weight to the cap while it's curing (30 days) you may
want to do the following. Route a small groove (1/4 wide", 1/8" deep or so)
all around the bottom of the cap. About a 1/2" or so in from the edge or
far enough in so the groove is over solid wood or whatever the cap sits on.
Slightly overfill the groove with silicone and put it in place, wiggle it
around slightly to smear the excess and weigh it down. Now the silicone is
glued to the knee wall and there is a bead of silicone holding the top from
any lateral movement. Doubt anybody would be pulling on it hard enough to
break the seal.
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