what to do with shower stall installation?

Discussion in 'General Plumbing Help' started by lamothe1, May 15, 2018.

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  1. May 15, 2018 #1

    lamothe1

    lamothe1

    lamothe1

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    I’m rebuilding my shower stall. I was going to put 40 lb felt on the wall then Hardiboard on top of that and seal it with “redguard”. Well I got a little carried away. I put up the Hardiboard ,but forgot to put my 40 lb felt behind it. Now I’m wondering if I should remove the Hardiboard and install the felt or just forget it as I’m positive that the redguard will seal the moisture from getting through.
     
  2. May 15, 2018 #2

    havasu

    havasu

    havasu

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    My recommendation is to do it the correct way. Any moisture build up will rot your walls and it is cheap insurance, and required, not just recommended.
     
  3. May 15, 2018 #3

    lamothe1

    lamothe1

    lamothe1

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    but won't the redguard seal the moisture from getting into the hardiboard and beyond?.
     
  4. May 15, 2018 #4

    havasu

    havasu

    havasu

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    Probably, but Redguard can and will leak, especially with contracting and expanding. Did you also tape and mud the joints?
     
  5. May 15, 2018 #5

    lamothe1

    lamothe1

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    i will, but haven't got that far yet. saw a couple of u-tube videos where they say not to put a moisture barrier behind the hardiboard where it can breath so mold can't start.
     
  6. May 15, 2018 #6

    havasu

    havasu

    havasu

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    Felt is not a true moisture barrier, but separates the concrete from the wood studs. Remember, wood and anything concrete are not a good mix without some sort of substrate between them.
     
  7. May 16, 2018 at 1:55 AM #7

    brian_h

    brian_h

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    I suggest you post over at John Bridge tile and
    I suggest you try posting at John Bridge Tile. They can help you with the details needed for the use of Hardi and Red Guard
    http://www.johnbridge.com/vbulletin/forumdisplay.php?f=1
    BTW... RedGuard is a good product when done correctly. There are a few others that someone there may recommend. I wouldn't use it as a floor membrane, IMO...
    -Brian
     
  8. May 16, 2018 at 3:10 AM #8

    havasu

    havasu

    havasu

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    I use Johnbridge.com quite a bit. I love to see the ideas and designs that are posted by their professionals.
     
  9. May 16, 2018 at 1:31 PM #9

    digitalplumber

    digitalplumber

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    Having recently done a novice shower at my sons house, with the help from JB Forum, I used Kerdi over Hardi. Kerdi is another waterproofing method. I did not use anything behind the Hardi board, nor do I remember being told to. Had I known sooner, I would have just used sheetrock with the Kerdi applied to it or just use Kerdi board and not the Hardi.
     
  10. May 17, 2018 at 4:50 PM #10

    lamothe1

    lamothe1

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    thanks, i checked out their web site - it's great
     

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