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Thread: Setting shower base and tub base

  1. #1
    Civil Engineer myrightnut's Avatar
    Join Date
    Oct 2006
    Ontario, Canada

    Default Setting shower base and tub base

    Hi All,

    I need some advise regarding the above....

    I purchased a Shower kit which included the glass for doors and the base. The unit goes in a corner of the bathroom and you tile the corner walls.

    Here's my problem.... I spent a long time leveling the concrete floor under the shower (the new bathroom is going in the basement) and have it damn near level in all directions. I set the shower base down and its not level... After alot of shimming and swearing I took off the base and found that the base is no where true... the block supports are not level and the tilling lip is not even vertical... this pushes the base away from the wall and the blocks put it out of level (almost half to a full bubble!!!).


    I'm going to shim the base to make everything level and drain properly... I would like to make the install permanent and have thought about using the expanding foam insulation underneath to keep it in place and allowing it to fill in the voids to make it solid. has anyone done this before?

    One plumber said that he would take a belt sander and sand down the uneven areas of the acrylic base to make it sit right... another said to put down a bed of thin set... which I thought about... but since it dosn't site right Im afraid I will just make the situation worse this way.

    I got the Idea (of using the expanding foam) from listening to my supplier of my tub... who said that when he installs the tub, the base of the tub has pads it sits on and he fills in the void between the pads with the expandable foam... he says it helps insulate the tub and makes it quite solid.

    Your thoughts and ideas are very appreaciated!

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Most places use mortar. You can use what is called deck mud, which is a mix of mostly sand with some concrete in it. There are other products that will work.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    Set it in mortar. This will not only allow you to level the base, it will fill in the void under the base and solidify it so it won't flex.

  4. #4
    Homeowner geniescience's Avatar
    Join Date
    Nov 2005
    humid summers hot, humid winters cold

    Default foam or mortar

    no to sanding\
    no to thinset/

    ok to use minimal expanding foam if you are comfortable with it
    ok to use mortar.



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