Plumber told me a trick he used on rentals, slip 30lb tarpaper under tub.
Unless creak is coming from upper tub lip the you are screwed

 

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https://www.youtube.com/watch?v=_7e1zljg8Oo

I prefer gasoline, it works so much faster. Used to be fun to send the new guy out to get you a cup of gas and hand him a styrofoam cup.

Tom

 

Is it the cast rubbing on the floor? Foam/floor flexing?

If it's loud, I'd think it's the edge of the cast against the floor.

 

There's about an inch of foam under the steel.

 

Can you drill through floor below and foam from under it? I have used plastic tubing to extend the tip of foam gun for more reach.

I had one of those tubs and we ended up pulling after installing it as it creaked and setting it in non shrink grout which we do on all tubs and pans.

 

God, I hated those wretched tubs.

IRC, one time drilled holes thru subfloor every few inches and blew a full can of silicone or Lemon Pledge all along the way.

Back then, Lemon Pledge was my go to for just about everything that moved or squeaked, so I'm guessing that.

In any case, next time have turd herder put a piece of tarpaper or tyvek down.

And then stop using those sh!tty tubs.

 

I'd probably try slipping tyvek under it using some sheet steel. Don't know if it would work, though. Obviously a big factor is the finish work repairs.

 

Think I would remove the drywall have someone step in the tub and find out where the squeak is coming from before doing anything.

 

It could be the ledger if you used one.

I had one with a terrible squeak,. When the customer showed me I was a little pissed off as if what now......

Gave the side of the tub of rap with my leg and squeak when away. :laughing:. I think the mud job and tile floor pinched the apron a bit I was causing it to react. That was the end of it

 

Those tubs sVck. For lightweight tubs, try the AS ones with the composite underside next time...much more solid.

It could be that foam base kept the apron from contacting the subfloor evenly...or the ledger is moving. You might need to pull a couple floor tiles to get some shims under the apron, as well as spray foam the heck out of it underneath.

 

This IS an American Standard tub. Maybe exactly what you're talking about. Porcelain on steel.


Funny thing is another remodel I'm in the middle of got the same problem. Just yesterday I removed and reset the tub in a mortar base to fix the problem. I'll be doing that from now on.

Still not sure how to best deal with the other one that's in a completed project.

 

Revisiting this to report back.

Drilled about 10 1/2" holes through the foam at the bottom, then attached 1/4" pex as an extension to my foam gun and filled all those holes, presuming it would expand under the tub and fill most of the space.

Completely solved the problem, from an access "slot" no taller than the base trim on the adjacent wall.