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Unread 07-13-2009, 08:59 PM   #1
Edthedawg
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Redgard over reworked OmniGrip/Hardi shower stall?

Asking for a friend (honest - not me

Started his shower stall rebuild w/ 1/2" sheetrock behind the pan, then tarpaper, also behind the pan, then 1/4" Hardi onto the top of the pan lip (w/ gap), and then the tile hanging down, gapped to the top of the curb level. Sealed/taped corners and started putting tiles up w/ Omnigrip and then switched to Acrylpro (both pre-mixed). I stopped him and we talked waterproofing and thinset vs pre-mixed.

Having just gone thru this myself, I'm wondering if he can salvage this way:
-Pop off the tiles & scrub off the mastic
-Scrape/scrub/chisel the mastic off the Hardi, esp in the corners and any high spots
-Re-bed alkali-resistant FibaTape into the corners w/ some Versabond or Laticrete 254
-Skim a little Versabond (or equiv) onto the field areas (he's about 1/3 of the way finish tiled) (optional? horrible idea? definitely the right thing to do?)
-Apply a liberal double-coating of RedGard to the whole thing
-Re-install tiles using Versabond or equivalent.

As always, TIA for your help!
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Unread 07-13-2009, 10:08 PM   #2
ceramictec
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the mastic definitely has to go.
Hardi requires a 2" Alkali res. mesh tape and using RedGard is a good idea.
I would definitely use a waterproofing and set the tile with thinset.
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Unread 07-14-2009, 05:33 AM   #3
Edthedawg
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Brian,

Thanks for the reply. I'm giving him my surplus RedGard and 2" alkali-resistant mesh tape. But i'm still slightly concerned about what'll remain directly under the Redgard.

From my own experience, i know he's gonna have a bear of a time trying to clean the set mastic off the Hardi, even w/ ample water spraying, a good scraper, etc.

So I'm just looking to see if we get a "OMG no don't do that!" if he cheats on Steps #2 (getting every last speck of mastic off, VS. just getting the heavy stuff off and removing high spots) and #4 below (skimming over any set mastic in the field w/ some thinset).

Obviously best if he rips all the Hardi out and starts fresh, but as you can well imagine, he donna wanna do dat.

Thx again!
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Unread 07-14-2009, 09:04 AM   #4
ceramictec
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from not starting over the right way you can only take your chances by going over the old mastic. so if you clean it off as good as you can it's your call to make to go with the Redgard over it.
make sure he gets the proper MIL thickness of RedGard in 2-3 coats.
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Unread 07-14-2009, 09:12 AM   #5
rwcarpenter
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He has a second vapor barrier behind the cbu, he needs to take that down.

And while you are at it, you can loose the drywall and just fir out the studs and use just 1/2 backer board, either with 4-6 mil plastic behind it, or regard on it.
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