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Author Message   maaaa Citizen Username: Maaaa Post Number: 87 Registered: 5-2001 Posted on Wednesday, October 22, 2003 - 10:19 am:        We're almost to the tiling point in our DIY bathroom project and I've been reading about Hardibacker tile underlayment. There's conflicting opinions about fasteners and waterproof membranes. Anyone worked with this? Advice?   peteglider Citizen Username: Peteglider Post Number: 297 Registered: 8-2002 Posted on Wednesday, October 22, 2003 - 10:58 am:        I've done this a couple of times -- but *not* a professional! My comments are about bathroom walls, not floors. There are specific screws sold by the manufacturer. To me they don't look that different from sheetrock screws -- they're not expensive. Just don't drive them in too close or too deep or the materials cracks! I read that a barrier behind the material is not needed, although the seams need to be taped/sealed per the manufacturer. As I recall its a fiberglass tape -- but check on that. It wasn't that tough to do -- at least compared to the messy demolition! Good luck -- Pete   Michael K. Mc Kell Citizen Username: Greenerose Post Number: 70 Registered: 9-2003 Posted on Wednesday, October 22, 2003 - 11:55 pm:        For the floor use "Du-rock" and screw in with appropriate length. I like to apply a thin bead of construction adhesive (liquid nails) to the subfloor prior to laying the Du-rock. I installed this in my very moist basement and haven't experienced any problems. This application is generaly for walls. Michael K. Mc Kell   maaaa Citizen Username: Maaaa Post Number: 88 Registered: 5-2001 Posted on Thursday, October 23, 2003 - 10:18 am:        Thanks for the help. I've used Du-rock before and wasn't happy with it-- it's too crumbly to do fine cuts. I'm hoping that the Hardibacker can be cut cleaner around the shower taps.   Earlster Citizen Username: Earlster Post Number: 11 Registered: 8-2003 Posted on Thursday, October 23, 2003 - 2:07 pm:        I used Hardibacker for my bathroom floor. It is really nice to cut using a Jigsaw (make sure you get the right blade). It's also lighter then the concrete stuff. I liked it a lot.