We have a plastic bathtub that creaks a lot when we step in it. I did a
group search, and several times in the past someone has recommended putting
expanding foam underneath to support it (for repairs). What kind of foam
should I look for? Is it the same stuff used around doors and windows to
fill cracks? I assume that the foam won't bulge the tub as it expands?
The expanding foam WILL distort, and may even dislodge the tub if you
use too much of it. You should inject something that expands
very little, or not at all. There may be construction foams that are
low-expansion, or you may wish to use concrete with a lightweight
aggregate. As long as you're cutting a hole
in something to get the foam or aggregate in, inspect for water
damage and rot while you're under there.
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