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Thread: City of Palo Alto rejects any drywall in wet areas - suggestions for backing?

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    DIY Member tom12's Avatar
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    Default City of Palo Alto rejects any drywall in wet areas - suggestions for backing?

    The Building Dept of Palo Alto rejects the use of green or any other drywall in wet areas. To achieve a S&C floated surface for tile, what other backing suggestions would you recommend? Perhaps a Two-Coat float over mesh and 15 lb felt?

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    Test, Don't Guess! cacher_chick's Avatar
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    Everyone in the country is using cement board, or some variation of it.
    It's been this way for a quite a few years now.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    They seem to be oblivious that if a waterPROOF surface membrane is applied properly, the drywall is NOT in a wet area. But, trying to talk sense into some people is useless. The only thing I'd consider is to show them the TCNA method approval that allows it. But, as said, it's based on a proper install. You do what you have to, so cbu, while harder and more expensive, is usable underneath any of the surface membrane materials, either painted on or those in sheets. Note, not all sheet membranes support drywall - the TCNA procedure references the manufacturer's recommendations. Kerdi, for one, prefers this, but is equally viable over other backing materials to meet local ammendments to the TCNA procedure. I guess the thousands of installs that are in great shape has no credence...fighting city hall is possible, but sometimes not worth the effort when a viable alternative is available.
    Jim DeBruycker
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    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Senior Member dlarrivee's Avatar
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    Jim we both know that people expect to hang board and tile right over it, I'm sure that is why the county is not allowing it.

    What about fibreglass faced gypsum board?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Seams where it's been cut are still problematic unless it's properly waterproofed. guess you just have to ask them what they'll allow.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by jadnashua View Post
    Seams where it's been cut are still problematic unless it's properly waterproofed. guess you just have to ask them what they'll allow.
    Problematic how?

    You could use fibreglass faced drywall everywhere in a bathroom, waterproof the wet areas, and skim coat the rest.

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    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-18-2014 at 08:12 AM.


    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

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    DIY Senior Member dlarrivee's Avatar
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    Be careful, if I didn't know any better I would say that John makes more money promoting products on the internet than he does remodeling bathrooms.

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    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-18-2014 at 08:13 AM.


    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

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    DIY Senior Member dlarrivee's Avatar
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    Are you related to Billy Mays?

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    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-18-2014 at 08:13 AM.


    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

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