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Old 03-08-2012, 09:07 AM   #1
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Shower remodel continues to grow...please advise


Hello all,

I apologize for the novel! But, REALLY appreciate the adivce.

I currently have a stand up fiberglass shower...originally, I was going to tile above this, however, when roughing up the wall and removing paper (drywall) that had deteriorated, I discovered mold. It was very minor surfuce mold, but, mold nontheless. So, I will be removing the drywall and the stand up unit and installing a prefab shower pan and then tiling the walls. Now, onto the method (my questions).

After I demo, I will head to home depot and pick up a prefab shower pan. It seems as though it is very beneficial to set the prefab unit in mortar regardless of if the manufacturer reccomends this or not (is that correct?). Are there any tips I should be aware of before doing this? (besides making sure its level).

After that, I will secure the flange of the pan to the studs. Then I will protect all of the studs with 4 mill plastic vapor barrier (overlapping each layer by 6"-8"). Now, heres where I get a little confused...Ive read (and this makes sense to me) to overlap the bottom of the vapor barrier over the shower side of the pans flange...then sillicone the back of the vapor barrier to the flange...this way, any water that gets through (cement board will be on walls secured with galvanzied screws) will hit the vapor barrier and flow into the pan. This makes sense, but, then I suppose you cant place thinset or caulk where the cement board meets the flange...can someone(s) clarify this for me?

Next, I'll hang the cement board. Then, use fiberglass tape (alkali resistant) at the joints and thin set (bag mix white latex modified). Question for this...where the cement board meets the ceiling, do I use a bag mix of 20-45 min easy sand on both sides? Then hit it with thinset when I go to place the tiles?

After all of this I will install the tile (thinset and grout). Then seal the grout. I will caullk the corners and edges.

Is any of this a poor decision? Am I forgetting something? THANKS!

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Old 03-08-2012, 10:54 AM   #2
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Shower remodel continues to grow...please advise


No vapor barrier under cbu.

Waterproof cbu with Kerdi, Red Guard etc.

I normally use thinset at the seam between cbu and drywall. Extend tile past the seam to hide it.

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Old 03-08-2012, 12:06 PM   #3
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Thanks Penny, I had thought as long as you use the poly or red guard as your barrier, that you were covered. But, Im a newb when it comes to DIY. Thanks for the info. I will likely install a little recessed shelf into the cement board as well, so, perhaps a few coats or redguard in place of the poly is a better bet for keeping the water off of the wood studs.
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Old 03-08-2012, 12:30 PM   #4
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Shower remodel continues to grow...please advise


You want to waterproof the cbu, then the studs dont get wet.
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Old 03-08-2012, 12:36 PM   #5
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You want to waterproof the cbu, then the studs dont get wet.
Thanks again! I see you're from Lehigh valley...I actually graduated from Lehigh in 2007. Small world I guess
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Old 03-09-2012, 07:42 AM   #6
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Shower remodel continues to grow...please advise


Listen to 12 penny--good advice---
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Old 03-09-2012, 07:48 AM   #7
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Will do! Bought the Red Guard last night actually! Thanks to you both!
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Old 03-09-2012, 07:57 AM   #8
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Thanks again! I see you're from Lehigh valley...I actually graduated from Lehigh in 2007. Small world I guess

Ya...small world. Been here since mid 60's. Nice place to raise a family. Though its beginning to get a little crowded.

Thanks Mike.
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Old 03-09-2012, 10:14 AM   #9
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I normally use thinset at the seam between cbu and drywall. Extend tile past the seam to hide it.
This is a great idea, thanks! But, how to you handle the seams with the cbu and drywall at the ceiling?
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Old 03-09-2012, 12:09 PM   #10
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Shower remodel continues to grow...please advise


I'd probably smear a little caulk into it. Whatevers open. Just plug the hole.

Run tile to within an 1/8" or so of ceiling then caulk with whatever matches yur grout color.
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Old 03-09-2012, 09:04 PM   #11
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Shower remodel continues to grow...please advise


I strongly agree with waterproofing the surface of the backer---Red Guard is fine for that--I like Hydroban but it's rather pricey--If you add the niche pay extra attention to waterproofing in that area.

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