Grout Questions

Discussion in 'Shower & Bathtub Forum & Blog' started by jdbs3, Sep 28, 2009.

  1. jdbs3

    jdbs3 New Member

    Jan 24, 2008
    Plaistow, New Hampshire
    My bathroom tub is leaking along the caulk/grout line where the wall tiles meet the cast iron tub. I have decided to use grout rather than caulk. A few very basic questions:

    o What type of grout:

    - sanded or unsanded,
    - pre-mixed grout or unmixed?

    o Should the grout be mixed with an exterior grout additive?

    o What type of grout sealer is recommended?

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Industry standards for tiled things says caulk at all changes of plane, so good luck with grout there. since it is against industry standards, I'm not going to suggest any kind of grout. Good luck. If the caulk is failing, it could be for several reasons...what is the tile attached to? Drywall gets used more than it should (NEVER) in a tiled shower/tub area. Also, the tub might not be level, causing water to pool against and edge, which will create problems, too.
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  4. Sparty007

    Sparty007 New Member

    Jan 25, 2007
    Grout + Sealer is not waterproof - FYI

    Seal that joint with 100% silicone caulk and you'll be in better shape. It will withstand water very well.
  5. Mr Fixit eh

    Mr Fixit eh DIYer

    Feb 21, 2005
    Amateur Home Renovator
    Ontario, Canada
    Another tip that I learned from my tile supply store is that when you caulk the tub-to-tile joint, you should fill the tub up with water and leave it sit over night. That will prevent the caulk from stretching and cracking down the road.

  6. rayh78

    rayh78 Member

    Sep 15, 2008
    Colonial Heights, Virginia
    like others said you dont want grout there and its no as waterproof as caulk.
    Tub moves a little and the grout will crack.
    Use the best caulk you can get. Not rated for interior but think its just because because takes a while for a little bit of a smell to go away.
    But try Solar Seal or big box stores sell Quad brand which would be my second choice.
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