the carpet guy was replacing some carpet.
it's laid down on a plywood subfloor.
i noticed one gap in the laid down panels
that you could peek into the basement thru.
you could also get a ruler thru the gap &
measure the plywood thickness.
i was shocked to realize it wasn't that
the panels are stamped 23/32, and tongue
and groove - google'ing it - it seems the
23/32" is the same as 3/4 - but these panels
are NOT even close to being 3/4" thick ...
now i must be missing something here in the
way thickness is depicted.
should the panel really be 3/4" thick (ie.
measured on a ruler), or is there some "trade"
custom in measurements of plywood subfloor
thickness that is used ? i would imagine an
actual 3/4" thick plywood panel would be a very
heavy dead load on the joist.
it actually measured on the ruler a little less
than 1/4" thick - and the blueprints call for a
standard 40 psf load limit.
the panels should indeed be 3/4" (well, actually 23/32) measured on a
ruler. Are you sure you are measuring the full sheet, and not bumping
the tongue with your ruler or something? if it was actually 1/4"
thick, you would definitly notice the flimsyness and there would be
bellies between the joists.
well, there was a small gap in between 2 panels, and i
could stick a ruler into the gap (and could peek thru it
to see the basement). so when i stuck the ruler into the
gap, and measured the plywood thickness at that gap edge,
it was about 1/4" or so.
but yet the plywood panel underneath is stamped 23/32,
tongue & groove.
the panels are all flat and don't seem to be flimsy, so
it's a mystery that made me ask if i'm measuring it wrong.
so if it really was 1/4" thick, i'd know it for sure ??
the joists are 2x10's 16" o.c. (and some areas are double
and triple joisted, and there are wood cross braces in
between most of them - there's a fireplace in the same
room) with those plywood subfloor panels.
Tongue & groove means the edge of the plywood, at the mill, has a 1/4"
cut in the top and bottom sides, leaving the middle 1/4" to stick into
the slot cut in the other edge of the next sheet of plywood.
So if you have a slight gap between the sheet, but not enough to expose
the whole edge, you could measure just the top cut on the T&G.
It makes for a stronger joint to have the two pieces interlock.
NewsGuy.Com 30Gb $9.95 Carry Forward and On Demand Bandwidth
It's also possible he's seeing a ripped off edge that doesn't quite meet,
and has been undercut by a chunk split out of the underside of the ply.
In any event, 1/4" floor sheathing would be more than flimsy. If you
stomped on it, there's a good chance of going through. You'd get a very
queasy feeling walking on it.
Chris Lewis, Una confibula non set est
It\'s not just anyone who gets a Starship Cruiser class named after them.
Some subfloor is 5/8" thick panels. I would be more concerned with be able
to peak into the basement. Sounds like somebody went off layout. I would
nail a 2X4 alongside the joist then nail the panel down.
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