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Posted by SteveF on July 9, 2006, 10:58 am
>I have a joist that bows upward, causing my plywood subfloor to be
> uneven (3/4" over 4ft). How do I level the plywood subfloor in order to
> install nail-down 3/4" wood flooring? I thought about using a leveling
> compound such as LevelQuik RS, but I was told that the compound will
> crack if I try to nail the flooring through it and into the subfloor.
> I tried using some roofing shingles that I had in my garage as someone
> suggested. When I test fitted the flooring, the 3/4" drop was cured,
> but I ended up with a new problem: The flooring was uneven in the other
> direction, creating gaps and a buckling effect.
>
> Any other suggestions?
>
> Thanks.
>
> P.S. I don't want to go to the extreme of cutting and sistering the
> joist if I can get around it.
>
Having just done this to the whole second floor of my house, if it's only
one joist you will spend more time screwing around with shingles and
leveling compound that just pulling up the plywood and fixing the joist.
Pull out the plywood nails with a nail puller. Correctly done it should be
a gouge the size of a dime.
Buy or make a very straight board. Clamp the board to the side of the
problem joist down far enough to use it as a guide for your circular saw.
Run the circular saw down the length of the crowned joist and cut the 3/4"
rise off.
Replace plywood.
Steve.
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