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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"?
 

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solar guy
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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.
 
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