Wonderboard on Shower Walls


Old 08-09-04, 08:55 AM
Visiting Guest
Posts: n/a
Question Wonderboard on Shower Walls

I am currently finishing a basement. My intention is to tile the entire shower down there (ceiling included). The guy who provided a quote on laying the tile said that 1/2" wonderboard on the walls should be sufficient and I can attach that directly to the studs (no need for green board or anything behind the wonderboard). It sounded kind of flimsy to only have the cement board with no green board backing but since I have never done this, I can't say for sure....Any advice?

Two other questions:

When laying tile on top of cement, do I need anything between the tile and cement or can I just slap down the mortar and lay the tiles?

Are there any corner pieces that have to be put on wonder board (like with drywall) or is the seam just left open and covered with mastic as you tile?

Sponsored Links
Old 08-10-04, 05:42 PM
Banned. Rule And/Or Policy Violation
Join Date: Jul 2004
Posts: 463
Received 0 Votes on 0 Posts
No Greenboard

The guy who quoted you quoted you correctly:

Concrete board goes directly over studs with nothing behind it.

Tile goes directly onto concrete with a thinset mortar only.
Old 08-11-04, 02:34 PM
Join Date: Nov 2000
Location: Austin, TX
Posts: 5,074
Received 0 Votes on 0 Posts
Originally Posted by homebild

Tile goes directly onto concrete with a thinset mortar only.

If there are stress cracks on the concrete floor, you need to apply an anti-fracture membrane.
Old 08-14-04, 06:37 AM
Visiting Guest
Posts: n/a
I agree with both statements.
Perry said if you have stress cracks, I would just add that an antifracture membrane is Always a good idea over concrete wether there are stress cracks or not.a bathroom is a small area and the extra cost for peace of mind is minimal.HD has a very simple paintable membrane called redgaurd. paint it 2 coats letting it dry between coats.after it dries completly tile as normal.(hint, add some fiberglass tape at the wall floor edge and paint up the walls 2 caots about 2" to protect from moisture damage.add baseboard or tile base to hide this waterproofing.
Redgaurd runs around 35 bucks a gallon at HD and this will be plenty for a bathroom floor
Old 08-15-04, 08:45 AM
Visiting Guest
Posts: n/a
Before you go sealing that floor up with the redgaurd you may want test for moisture.Take some 6 mil plastic and duct tape,yes duct tape and cut the plastic into a 1 foot by 1 foot square and tape to the floor sealing all the edges and let sit for 24 hours and see if there is any moisture present if not then go ahead but if there is then you want to do a cacium /chloride test to see how much moisture is present then go from there.If you exceed the tolerances of the redgaurd and the tile it will fail you .

Also you want to tape and thinset all the joints in the c.b.u.on the walls.Take nylon mesh tape for durock and the flat side of a trowel and tape all the joints, inside corners as well and let dry then tile
Old 08-15-04, 02:59 PM
Visiting Guest
Posts: n/a
when installing the wonderboard put the screws every 6" instead of the way you do sheetrock
Old 08-23-04, 09:46 AM
COBALT's Avatar
Join Date: Jul 2004
Posts: 176
Received 0 Votes on 0 Posts
Hey since I'm doing roughly the same thing what about the shower area? I've had some people say I have to put 6 mil plastic behind the wonderboard for the shower. Is that true, or can I just screw the wonderboard to the studs, thinset, and start tiling?

The reason I'm asking is that I've already hung all of the wonderboard directly onto the studs, and then was pissed at myself after someone told me I had to take it all down where the shower is and put plastic up first....lol. I'd like to avoid redoing this part of the job.
Old 08-23-04, 05:59 PM
Visiting Guest
Posts: n/a
if you dont put the poly behind it so it over laps the shower pan ,you need to install a surface membrane on top of it.The membrane should meet ANSI 118.10 and may be either a sheet like Nobleseal TS or a liquid applied like Red Guard.
Old 08-24-04, 09:30 AM
COBALT's Avatar
Join Date: Jul 2004
Posts: 176
Received 0 Votes on 0 Posts
I thought about using Red Guard. It looks pretty easy to apply. What about where the wonderboard meets the acrylic shower pan?
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: