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Shower Pan Slope

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  • Shower Pan Slope

    I know that a shower floor needs to slope 1/4" - 1', but when installing a large shower 4' x 7' do I set the float strips at 7 x 1/4" = 1 /3/4" + 3/8 and accept the larger slope on the shorter dimension. Also, if I'm using larger 8 x 8 tiles is there any concerns with the slope.

  • #2
    Re: Shower Pan Slope

    oops Typo. 3.5' x 1/4" = 7/8 + 3/8 = 1 1/8"

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    • #3
      Re: Shower Pan Slope

      Mark,
      How are you going to bend the large demesioned tile to fit the curve of the slope? You will end up cutting the 8 x 8's to fit correctly and it will look pretty unprofessional. I rarily if ever use tile larger than 2 x 2 for shower floors and never over 3 x 3. I strongly suggest you reconsider using the 8 x 8.

      Darrell

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      • #4
        Re: Shower Pan Slope

        To add to Darrell's comments about a professional look, the ENTIRE perimeter of the floor needs to be on a level plane--if not, the floor/wall junction will look like it was done with a plow.

        8 X 8's on a sloped floor? It will end up looking like the floor of that filthy restroom on I-5, and the excessive lippage will try to collect all the stuff that should be going down the drain.

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        • #5
          Re: Shower Pan Slope

          Michael,

          Then the entire perimeter should be at the prescibed height for 7 feet no matter what the width may be?

          Thanks.

          Jeb

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          • #6
            Re: Shower Pan Slope

            Based on these responses, the bathrooms that I have seen using larger tile must have little or no slope to get the tile to lay flat. So can I use 4 x 4 or do I have to use Darrel's suggestion of 3 x 3 or less.

            Thanks for the feedback

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            • #7
              Re: Shower Pan Slope

              The dimension you need is not 7', it is the longest diagonal from the drain to the corner, which will presumably be something like 4 feet.

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              • #8
                Re: Shower Pan Slope

                Mark,

                as MB says your perimeter needs to be level. With the perimeter level you would have a "Steeper" slope parallel with the longer wall. Unless the drain is exactly the same distance from all the walls,curbs you will have a different pitch on every side.A wood float with the corners rounded off(like a pool floaters trowel) would help "shape" the mud and give you a nice flow . 4x4 would be the max.imum size I would lay without causing serious lippage. If your using small grout joint say 1/16 or 1/8 lippage could be a problem, a 3/16 should cure that. If your tiles have rounded edges that would help even more.

                Cisco

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                • #9
                  Re: Shower Pan Slope

                  I am removing a bathtub, 30 years old, and replacing it with a ceramic tile shower. The shower bed will be 31" x 60". The drain is centered. That means that across the 15"@center I would have only 3/8" slope? Then across the longer side, 30", I would have 5/8"?

                  Also, looking at Michael Byrnes' article on "Morter Bed Shower Floors", I am putting this shower on an existing concrete slab floor. What parts of the layering can be skipped or altered for slab applications? I am useing a waterproof wallboard. Should I also use the cement backer board? Thanks, Tim

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