Acrylic Tub Mortar Problem

Discussion in 'Shower & bathtub Forum & Blog' started by swiederin, Nov 3, 2012.

  1. swiederin

    swiederin New Member

    Messages:
    8
    Location:
    Iowa
    I bought a new acrylic & fiberglass reinforced American Standard tub. The bottom of the tub has a piece of OSB moulded to it. The instruction say to use mortar to set the tub. How will this work with the OSB? It is not packing material. Need some clarity.
  2. johnfrwhipple

    johnfrwhipple Bathroom Design & Build - North Vancouver, B.C.

    Messages:
    4,138
    Location:
    North Vancouver, BC
    Does the OSB make full contact with the bottom of the tub?

    Can you post a picture?

    JW
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,002
    Location:
    Bothell, Washington
    Many tubs have OSB or wood on the bottom. I set several piles of mortar down and allow the tub to squish out the piles as it drops into place. The mortar as it drys tends to pull away a bit anyway. You can also lay a sheet of plastic down between the mortar and the tub.
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,003
    Location:
    New England
    The goal of installing any tub is to get it level and have full contact with the subflooring. If you are really lucky, you may not need anything underneath it. For the vast majority of installations, though, it works out best if you use some mortar to get that full support and make things nice and level. Make sure it is level both L-R and F-B, as doing so makes finishing it up and performance easier/better.
  5. swiederin

    swiederin New Member

    Messages:
    8
    Location:
    Iowa
    I was thinking that the mortar would need to flow into an area with ridges/gaps to provide some stability.
  6. swiederin

    swiederin New Member

    Messages:
    8
    Location:
    Iowa
    Probably want to use some plastic underneathg the mortar as well as between the mortar and the OSB/tub right?
  7. swiederin

    swiederin New Member

    Messages:
    8
    Location:
    Iowa
    It appears to. Do I need to change the location of the ledger boards to allow for mortar?
  8. John Bridge

    John Bridge Mudmeister

    Messages:
    49
    Location:
    Houston, Texas
    Use the small piles as Terry suggested. Make the mud loose, just enough body to allow it to stand up a little, no so stiff that is will not spread out. About ten piles under the base will do it. :)
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