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Unread 08-23-2007, 01:50 PM   #1
Registered User
Join Date: Aug 2007
Posts: 5
Bathroom renovation

In the middle of bathroom gut/renovation; wish I had found the website 6 months ago! Due to the mold/moisture problems I found (there wasn't even greenboard behind the shower tile, and the exhaust fan vented into the ceiling insulation!), I decided to do the entire bathroom in hardibacker- 1/2" on walls and ceiling, 1/4" on floor. The questions:
- did I overdo it with 1/2" on the ceiling? 2x12 joists, 16" oc, the span is only 6'6, and only the area over the shower will be tiled.
- does Kilz do a good job of priming the hardibacker for painting?
- is premixed thinset ok? especially for the tile above the shower?
Also, I am doing a sloped mud base for the shower membrane and tile. Is there a rule-of-thumb for the amount of water to be added to the cement/sand mix, so that I get the proper consistency? Never did this before!
Finally, the plumbing for the drop-in tub really needs an access panel. The base will also be hardibacker/tile. What's the best way to do the panel, such that it nearly invisible but still relatively easy to remove? THANKS!
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Unread 08-23-2007, 02:00 PM   #2
chuck stevenson
Contractor -- Schluterville Graduate
Join Date: Aug 2006
Location: Columbus, Georgia
Posts: 2,248
Welcome to the JB Forums,

Visit the 'Liberry' in the dark blue band above. Much info on deck mud.
You should also get John's "Tile Your World" book. It will save you money in the long run.

You can also do a search for access panels

No curb, walk-in shower.
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Unread 08-23-2007, 04:48 PM   #3
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 15,168
Well, cbu on the entire surface of a bathroom is overkill, it only needs to be in the shower and the floor, but won't hurt anything except the extra work and cost. Don't use mastic...use thinset, it's cheaper and works better in the long run.

Some people like to spread a thin coat of drywall mud over cbu to help it match drywall texture (i.e., smoother), but, if your entire room is done in it, it may not matter. See what others think about finishing the cbu with paint. Getting all of the screws and seams covered may end up being a pain for painting.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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