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I'm using hardi backer board under my tile, over a wood subfloor, and I will be using thinset between the hardiboard and the subfloor; can I tile immediately after installing the hardiboard?

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Yes! Not a problem. – bcworkz Feb 16 '14 at 1:58
why didn't you screw the hardi-backer down to the subfloor? How thick of a bead did you use under the hardi-backer? – shirlock homes Feb 16 '14 at 11:58
I've actually never seen hardibacker set in thinset. It's ALWAYS screwed down, and I have seen dozens and dozens of bathroom installs. I would assume it'd be fine though. Personally I'd wait 'till it's set. If you walk and kneel around on it immediately it will shift and not set evenly. – Speedy Petey Feb 16 '14 at 12:46
@speedy-petey, I will be screwing it down, however the instructions on hardi's website states to lay it in thinset, then screw it down, but it doesn't state when it can be walked on. – CodeMonkey1313 Feb 16 '14 at 13:23
I'd still give it time to set up. I would not walk on it for at least a couple of hours. It's just insurance that it will set properly. – Speedy Petey Feb 16 '14 at 14:12

I spoke with someone at Home Depot, and they made a good point - You're screwing it down on top of the thinset, and therefore you're already on top of the board. The more important part is to let the thinset on the seams (along with the tape) set up for a while (a few hours) before tiling. We did just that, and so far so good - the tiles went down fairly smoothly, though I still need to grout.

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