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Thread: Tub Installation Questions

  1. #1
    DIY Member MikeG's Avatar
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    Default Tub Installation Questions

    I'm getting ready to install a Kohler drop in whirlpool tub (6' Miraposa) and had some questions.

    1. Kohler calls for either using a 2" mortar base, construction adhesive, or silicone caulk around the rim. I'm thinking either the mortar base or construction adhesive is the way to go. What is easier for a novice to stall? If I go with construction adhesive is there a recommendation for the brand?

    2. I have roughed in the plumbing to the p-trap. Based on the installation instruction for the tub drain (Kohler Clearflow), it calls for a tail piece between the drain T (where the overflow and the tub drain meet) and the p-trap. Since the open end of p-trap is a pvc piece that needs to be glued in (not threaded) what type of tail piece should I use?

    3. Finally, any other tips for installing?

    Sorry to ask all of the basic questions.

    Mike

  2. #2
    Plumber jimbo's Avatar
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    I am not clear where you would use Liquid Nails on a tub install. If it is fibereglas or plastic then bedding the BOTTOM of the tub in mortar, preferably GypCrete lightweight mortar, is good, as recommended by Kohler. If it is a drop-in, then silicone caulk would be used around the rim.

    You will need a trap adapter to connect your tubular tailpiece to the PVC trap.

  3. #3
    DIY Member MikeG's Avatar
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    Jim -

    Thanks for the response. The tub is a drop in. The instructions do call for the mortar bed of construction adhesive on the feet/blocks.

    For the p-trap adaptor, will this have a threaded top to attach to the drain T?

    After I dry fit everything, I'm guessing that I would glue the adaptor to the p-trap and then set the tub in place. The adaptor needs to fit into the drain by about an inch based on Kohler's instructions.

    Thanks, Mike

  4. #4
    DIY Member
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    I am not sure if MikeG read the Kohler instructions too well. I am currently installing a kohler mariposa as well. It says apply a mortar bed, and if you like, you can also use construction adhesive on the feet.

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