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determined1 03-22-2009 04:09 PM

screws that wont rust !!
I will be rebuilding my tile shower and I plan on using durock instead of the greenboard they used. The screws and nails I removed were all rusted and I didn't want to make the same mistake they did. What screws should I use and do I counter sink them?

gma2rjc 03-22-2009 04:33 PM

When I bought Durock, the screws that are meant to be used with it were located within a few feet of the stack of Durock. They're called Buildex Rock-On and they come in 1 1/4" (200/box) and 1 5/8" (150/box).

I don't remember if I had to counter sink them or not, but I'm pretty sure I did. I guess you wouldn't want the screw heads sticking out above the surface of the Durock.

Bob Mariani 03-22-2009 07:48 PM

The CBU screws are flat head and will set flush with the board. But... you need to coat the entire surface, seams nails, everything with Redgard waterpoofing. Tile and grout even sealed will still let moisture into the wall. Keep the bottom board off the floor enough to prevent wicking water up the bottom edge. SOooo. no special rust poof screws are needed.

gma2rjc 03-23-2009 12:02 AM

I'd still go with the rust-proof screws recommended by the Durock manufacturer. No matter how well you seal things, there is still a potential for water to get in.

determined1 03-23-2009 06:07 PM

Thanks for your help. The redguard I already planned on doing ,but I don't understand about not letting the durock touch the shower floor. The drywall in the shower now doesn't go all the way down and the water managed to get behind the bottom tiles, loosen them, and the greenboard disolved. I thought I was supposed to have the durock go all the way to the bottom, butt up against the tile floor and just make sure I seal the heck out of it.

Ron6519 03-26-2009 05:49 AM

Keep the cement board off the floor by at least 1/4".

Matthew in TO 01-05-2012 10:18 AM


Originally Posted by gma2rjc (Post 248355)
They're called Buildex Rock-On

There's also Backer-On for Hardibacker board. Here's the site here in Canada...

joecaption 01-05-2012 10:32 AM

You need room for the caulking at the bottom of the walls, that's why you leave a space. Thin set should not be used in the inside corners or any place the tile touches a differant surface, or changes direction.

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