On Wed, 20 May 2015 15:12:45 -0700 (PDT), Rafael Anaya
wrote:

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 would 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 issue. 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 steps 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 that 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.

any ideas?

thanks!

-R
Apray in the foam and fill the tub to keep it from lifting.