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-   -   Acrylic Bathtub Bed Of Mortar (https://www.johnbridge.com/vbulletin/showthread.php?t=47679)

waynewie 03-14-2007 07:32 PM

Acrylic Bathtub Bed Of Mortar
I need to set an acrylic bathtup into a bed of mortar. the tub is 1 inch above the floor at the drain and 1.5 inches at the high end. the instructions say put in a two inch bed of mortar (any suggestions on mortar type and consistancy). A 2 inch thick bed of mortar seems like a lot of mortar to squeeze out to get down to 1 inch.

How easy or hard do you have to push to set the tub to push the 2 inch mortar out so end up ithe the 1 inch at the drain and 1.5 at the back of tub? You need to get it level at the rim in the process. I have been looking through all the postings and find no detailed instructions for how to prepare the mortar, the mortars consistancy, setting the tub procedure. getting it level. Is there any step by step proceedure available that does not leave out important details that any one has prepared?

Davy 03-14-2007 08:14 PM

Hi waynewie, welcome. I usually set the tile on the deck first, get it nice and level and then set the tub in the hole.

The mud needs to be wet like wall mud (fat mud). Sometimes it's advised to lay a layer of plastic (poly) over the wet mud then set the tub on the plastic and mash it down. The plastic keeps the cement from sticking to the bottom of the tub in case it ever needs to be pulled out. It will still fit the shape of the tub and give it support. We don't ever measure the mud thickness, just flop down 5 or 6 shovels of mud and push the tub down into it. As long as the cement is touching the tub, it'll support it.

If you have a wood floor, staple down felt (or poly) over the wood and a sheet of wire lath so the mud will stay put. :)

Rob Z 03-14-2007 08:29 PM


Davy's got it...we've installed a lot of tubs that way and it works nicely. Once you get it pushed down into the mud and leveled, you can secure it to the studs with the heads of roofing nails or screws. Leave it alone after that.

Also, make the mud wetter than you think it should be. By the time you get it into buckets and up into the bathroom, it will dry a little bit. Nothing worse than getting the mud in place and plopping the tub down on it and only then realizing the mud is too stiff. :bonk: :eek:

cx 03-14-2007 09:34 PM

Seems like you could just stand in the tub if it wouldn't go down, Z.

Even if the cee-ment done already set up. :D

Rob Z 03-14-2007 09:38 PM

You funny CX. :mad: :tongue:

Mike_W 03-15-2007 07:22 AM

Hi everybody!

This is Wayne's son Mike.
We are tag teaming a bathroom remodel in my 1946 House.

Thanks for the quick response, we appreciate it. This is a great forum/community!

Davy, the wall mud or fat mud you mentioned, Is it the same stuff described in the Masonry Shower Seats article by John Bridge?
"An easier way is to buy a sack of masonry cement (Type S, N, or M) and mix it with sand and water -- about 16 shovels of sand to the sack "

Could any of you post a good recipe for this "fat mud" you speak of? Hopefully with a few brand names HD sells? Should we mix it according to the Shower deck calculator only wetter?
Example 1.3ft^3 deck mud = 27lbs Portland cement and 133 lbs sand?

Thanks for your help,

cx 03-15-2007 07:31 AM

Welcome, Mike. :)

For your purpose, the easiest thing to buy would be pre-bagged Mortar Mix or Mason's Mix at your local big-box. Quikrete brand at Homer's, for example. It'll work just fine and save you plenty hassle.

My opinion; worth price charged.

Tool Guy - Kg 03-15-2007 06:03 PM

Hi Mike,

I see you're in Milwaukee. Both Menards and Home Depot have the pre-bagged mixes cx is talking about. I'm into saving on the hassle part as well. :nod:

Mike_W 03-16-2007 11:53 AM

Thanks for the response everybody.

Tool Guy - nice to meet a fellow Wisconsinite! :nod:

We plan on using a 24" x 84" or so electric heating mat and new tile directly on top of the old very sound tile floor. The new floor height is not an issue.

The new tub will sit an inch or so further back into the tub alcove. Can I use this same mix mentoined above to fill in the gap that will be left between the old cement bed and tile floor and the new tub?

Is there a good method to waterproof this gap? Just silicone the gap between tile and tub? There is a passthrough door planned as well so maybe splashing out of the tub won't be much of an issue.


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