10:00AM | 09/10/03
Member Since: 09/09/03
3 lifetime posts
We have a property (not our primary residence) that we're remodeling. The bath needs redone in the tub area. Old tile was not grouted/sealed well, or if it was as the grout fell out it was replaced with caulk. As a result water seeped behind the tile and damaged the drywall. We've ripped it out and are down to 2x4's.

As it's not our primary residence, we are looking into putting in a tub surround rather than re-tile. (Easier and more economical.)

Here's the arguement: I'm a big fan of rockboard for water damage prevention. It's used in any bath we've done that we've tiled. However, the friend doing the work for us insists that greenboard is the way to go for a tub surround (he says better adhesion) and rockboard is strictly for ceramic tile (again, better adhesion but for tile only.)

It's critical I keep water from getting behind the new tub surround. What do you think? Greenboard or rockboard?



04:27AM | 09/23/03
Member Since: 02/13/03
90 lifetime posts
Your friend is right in my opinion.

Glenn Good

03:08PM | 09/23/03
Member Since: 09/10/03
314 lifetime posts
The first thing I would suggest is to install a 6-mil polyurethane vapor barrier over the studs. Then you can use either green board or cement board to cover it.

Green board is not nearly as good as cement board (like Durarock or Wonderboard) at withstanding continuous exposure to water. If any water should get behind the surround, the green board will not hold up as well over the long run and will lose adheshion where the cement board will not.

I would use cement board in that particular area. The adhesive for the tub surround should adhere to it just fine.



02:26AM | 11/19/03
Member Since: 11/18/03
3 lifetime posts
Greenboard is the cheap way out. Use cement backer board or check into Georgia Pacific's newer product for water resistance. Even concrete can transfer water.
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