I have a condo on the third floor of an eight year old building. The
floors are starting to squeek. I pulled up some carpet planning on
screwing down the sub-floor. However, my sub-floor has been coated
with a concrete layer (used for noise and fire control). How do I
locate the joists so I can screw down the subfloor to stop the
My thought was to locate the joists, bore out some concrete and screw
down then floor, then back-fill the concrete with self-leveling cement.
Is this a sound way to go?
I'm intetested in some ideas here. Sorry no help.
Had/have similar problme in 2-nd floor bedroom. Lifted up the carpet an add
nails, screws, etc. It got better, but did not eliminate all. Seems that
some of the squeaks are comming from the joists moving themselves. That's a
Assunming you can't find a stud finder to see through the floor
You will need to drill a series of holes about 1/2" apart until you find a
joist then measure 16" from that point to find the others (assuming it was
in fact built this way). Hopefully you have a good idea which direction
I have needed to do this on cielings with too much popcorn to use a stud
finder but not on a floor.
I would skip boring out the concrete and use concrete backerboard screws,
they have a tip for starting on concrete and an extra spiral for holding and
locking strength. They will self countersink unless that concrete layer is
thick and hard. You want to go at least 1" into the joist and maybe
further. Use 1-5/8" or longer.
If you plan to put carpet or tile on top, backfilling is probably not
necessary but if you plan on a vinyl floor, you definately want it very
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