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Thread: Plaster behind tiles or a waterfall out of the spa??

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    Join Date
    Apr 2011

    Plaster behind tiles or a waterfall out of the spa??

    I'm curious to know if you are suppose to plaster (seal) behind tiles? So you would put ?? around the tile line and then go back and mortar your tiles?

    What about on a rock waterfall or weeping wall out of the spa and into the pool? Do they seal that concrete prior to placing the rock? Thanks.
    34 x 19 salt water free form. 7.5" inside diameter raised spa. 24" raised beam in back. 3 moss rock waterfalls off raised beam and moss rock waterfall out of the spa. (2) Intelliflo VF pumps, 420 Cartridge Filter, 400 BTU Pentair low nox heater. 2.5" suction and 2" returns throughout.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Plaster behind tiles or a waterfall out of the spa??

    Normally tile is applied before plaster, and the plaster comes up to the tile and fills in-between the tiles, creating a waterproof joint.

    Often concrete waterfalls are sealed before stones are placed on top. Other times the stones are mortared in and the mortar seals things.
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