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-   -   What type of morter to use under bathtub? (

CowboyAndy 06-04-2008 06:46 AM

What type of morter to use under bathtub?
I have to pull my tub out to support it as the person who installed it had to level it, and it sits about an inch off the floor, making the middle totally unsupported. My plan is to put down 6 mil plastic (so the morter isnt directly on the floor in case it ever needs to come out) under and on top of the morter.

The question is what type should I use? What consistancy should I mix it to? Should I fill the tub with water while it is setting?


angus242 06-04-2008 08:16 AM

You could use spray foam. Actually, there are new tubs that come with foam blocks attached to the bottom for support. Just make sure the tub has water in it before you spray and that the foam isn't going to go places you don't want it to!

CowboyAndy 06-04-2008 10:54 AM

I thought about sprayfoam, but I am worried about it losing its rigidness over time...

angus242 06-04-2008 11:09 AM

Polyurethane foam will support it. It's more of a question of whether or not you can actually get a low-expanding foam in all the places it needs to be.
I would be careful. You don't want to use a thinset. Cement would be the best option. I believe thinset can actually shrink some so you may end up with a small gap under the tub :(
I'd say foam or cement.
Don't worry about long term, roaches and polyurethane will be around longer than we will! :laughing:

Brik 06-04-2008 04:28 PM

I have used "sand mix" mortar. Mixed to between peanut butter and pancake mix consistency. I built little cardboard dams to contain it and keep in from going where I didn't want it.

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