Hardibacker Over Drywall

highpeaks

For years I've installed 1/2 hardi over 30lb felt stapled to studs. Last week I spoke to another contractor who uses 1/2 drywall over the studs. Then laminates felt with roofing adhesive to the drywall. Then the hardibacker.

He says that is makes for a stiffer wall behind the tile. Does anyone use this technique? Any comments? What type and size screw would I use to make up the additional 1/2"?

ChrWright

That sounds like wasted overkill and an invitation for mold issues.

Is this in a shower? God I hope not. Gypsum has no business anywhere near a wet location.

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naptown CR

I have seen this done on too many occasions to remember. I think the original intent was to make it look like a mud set wall. Mud caps fit perfectly over the radius of durock. Tore out a bunch and didn't run into any more mold etc than normally seen behind shower walls. The felt might help but redguard over the durock would be better.

angus242

No need to double post:

http://www.contractortalk.com/f73/ha...-shower-65482/

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