shower pan

Discussion in 'Shower & Bathtub Forum & Blog' started by mmksb, Jan 22, 2006.

  1. mmksb

    mmksb New Member

    Jan 22, 2006
    Would like to know if you need a shower pan for a concrete floor
  2. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego
    Yes. Concrete is not considered watertight. Then, you have to penetrate it with a drain. And the joint between the floor and the walls would be a leaker. You need an impermeable pan with flanges, so that the waterproofing membrane on the wall can overlap that flange. Caulk alone can never be condidered to be the primary means of blocking water. Mechanical flashed (overlapped in the downward direction) joints are required.

    The drain in a shower, sealed with putty and/or gaskets is the weak link in most shower pans. But done right, it will last.
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Go over to go to their 'liberry' and check out shower pan installation/construction. Then, if you have other tiling questions, you can ask the tile experts there. Very useful and professional info from tiling spe******ts. A shower pan that will last without leaks and without smelling like a swamp must be installed with the liner on a sloped pre-slope. One where the liner is flat on the floor may keep it from leaking out, but because there is no slope, some water will accumulated under the tile and eventually start to smell. So, check it out, do it right, and enjoy...
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