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Thread: Great Stuff under tub?

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  1. #1
    DIY Senior Member Nate R's Avatar
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    Default Great Stuff under tub?

    I'm thinking of putting Great Stuff under my fiberglass tub to help get full support between it and the subfloor when I install the tub.

    Should I be using the Great stuff for Windows and doors? (Expands to fill spaces, but doesn't have enough force to bow vinyl windowframes) I guess I'm wondering if I should be worried about the regular stuff expanding too much and pushing the tub up.

  2. #2
    Jack of all trades frenchie's Avatar
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    Quote Originally Posted by Nate R View Post
    I guess I'm wondering if I should be worried about the regular stuff expanding too much and pushing the tub up.
    As well you should be.

    On the other hand, the minimal-expanding cures pretty soft - too soft to count as "support" of any kind.

    If you go with the great stuff, use as little as possible - maybe do some experiments out in the garage, first, to get a feel for it - and fill the tub so that the weight will keep the tub from rising.

    Or, of course, you could do it the normal way, with mortar.
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  3. #3
    Plumbing Contractor srdenny's Avatar
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    Try StructoLite. It's a type of perlited gypsum plaster that doesn't shrink, is easier to work with than mortar, it doesn't scratch surfaces and is easy to clean up.

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