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
thick.

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.