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Thread: Mortar type?

  1. #1
    DIY Senior Member Nate R's Avatar
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    Default Mortar type?

    OK, going to install my tub very soon now. What kind of mortar should I use to form a mortar bed for the Fiberglass tub to sit in?

  2. #2

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    Use the Quickcrete pre-mixed mortar or sand mix.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Some people prefer Structolite (sp?), it sets faster and is a little lighter. Probably costs more.
    Jim DeBruycker
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    Jack of all trades frenchie's Avatar
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    Actually, it costs less. By volume, anyways, if not by weight.
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  5. #5
    DIY Senior Member Nate R's Avatar
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    Didn't see the Structolite (sp?), so I used the Quickcrete pre-mixed mortar. Set a plastic bag between it and the tub to help facilitate removal if ever needed. Bag didn't indicate how long it will take to cure, only that it shouldn't freeze for 48 hours. I'm assuming I'll need to wait at least that long?



    Last edited by Nate R; 02-18-2008 at 10:24 AM.

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    You should be able to do anything you want to it the next day. Did you get enough under there to smush the tub down for good coverage?

    Concrete products are spec'ed at their listed strength after 28-days, but it's hard after a few hours. It takes awhile to chemically change into it's full strength, but after a few hours, it's pretty tough.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7
    DIY Senior Member Nate R's Avatar
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    We glopped on enough to be able to smush the tub down, yes. Measured the tub basin underside and drew out a line on the subfloor where it would contact. Then spread 1-1.5" or so of mortar around that area. Tub had some ribs on the underside that stuck out maybe 1/2"-3/4" so I think we had enough to fill the spaces between the ribs w/ no problem.

    Placed a garbage bag over the mortar and gently set the tub on it. Got it level, and then my wife gently sat down in it. Made sure it was still level and then screwed it into the studs.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Sounds good to me. Now, you mentioned pre-mixed. Hopefully, this was a powder that you mixed with water, and not something you bought in a bucket ready to use (aka mastic). If a bucket, it could take weeks to solidify as it needs to dry...it stays workable in a bucket because it doesn't get any air.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  9. #9
    DIY Senior Member Nate R's Avatar
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    Oh, of course not a mastic. I've learned too much between here and John Bridge to use mastic in this situation, or ever in a wet situation.

    Pre-Mixed in the sense that it was the right setup for Mason's mortar, I assume. (didn't need more sand or cement added, etc) Based off Cookie's response:
    Use the Quickcrete pre-mixed mortar or sand mix.
    It was a dry powder in a 60 lb paper bag, just like concrete.

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