I want to board one interior wall in the garage. It has been insulated. The
bottom plate of the framing is pressure treated. I have 3/8 plywood to put
up. Can the ply sit on the concrete floor , or should it be up from the
floor? I guess plywood can`t be taped and mudded like drywall? So I could
just put up strips where the ply joins the studs? It is a very small area,
as door and window take up most of the area. Two sheets of 4x8 plywood will
do it. Thanks.
If it was me, I'd leave a gap at the bottom, at least 1/2" so you can
hose the garage out and not have the walls soaking in water. If your
climate is one where it snows and the car tracks in snow another chance
to ruin it. If you are going to paint the walls you could fill the
cracks and nail holes with paint-able silicone seal.
I'd hold the ply off the concrete half the thickness of the sill plate. The
edge of ply tends to suck moisture, and if the concrete was ever damp, you
could get delamination. Doesn't your wall sit on a foundation? Garages built
on flat slabs are a bad idea, for a lot of reasons. If your wall is right on
a flat slab, I'd put down a baseboard of treated 1x6, and then plywood above
that. The cheap deck boards would be fine for that.
3/8 is still pretty thin- don't try to use it to hold hooks to hang
anything, without hitting a stud behind it. If you want a lot of hooks, put
up pegboard on standoffs, or a horizontal 2x6 rail, or something. (assuming
part of the reason for skinning this wall was adding storage- if not, never
mind...) Don't try to piece it in with little chunks to save 15 bucks on a
third sheet of plywood- it'll look like crap. If you lay it out carefully,
you will have only a couple of joints visible on the wall, and they will
fall on studs, and you won't need any blocking or battens to keep the joints
flat. I'd probably leave it bare, but if you are going to paint it, paint or
prime the edges of the panels before you put them up, to reduce the
water-sucking tendencies of the plywood.
I just noticed you said 'interior wall'. If this is a wall between garage
and heated living space, code in most areas requires it to have fire-rated
sheetrock or other code-approved fire breaks, no windows, and only
fire-rated exterior doors in the wall. Similar requirements apply to the
ceiling, unless there is a firewall in the attic space above. If it is a
front, back, or end wall, just dividing garage from outside world, plywood
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