I know this has been asked before when using spray foam for bathtub support
but hear me out :)
initial problem with tub was that it bowed in the center when in use and wo
uld pop back to place minutes after its use. first plumber opened an access
hole and stuffed in shims and spray foam along sides fixing some how the i
ssue. of course they did not check around the drain area before closing up
the wall and taking off.
im assuming they did not fill the tub with water before applying shims and
spray foam as it might have lifted the tub slightly causing the right side
of the bath tub drain to sink making a bending noise each time some one ste
ps around it. ive uploaded some videos to youtube of the bathtub noise and
another video of the first fix.
first video; https://youtu.be/hFtYCOS_jpQ
second video; https://youtu.be/Fp91BO2O280
spraying additional spray foam around drain leading to tub drain, would tha
t cause any issues with the drain? stepping on the area inside the tub you
can notice the drain move slightly. need added support around that area.