Hardiebacker gap questions [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile

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darrelstickler
02-07-2010, 05:24 PM
Doing floor tile. Have 3/4 inch plywood over 16" OC joists. Put down 1/4-inch Hardiebacker and going to use Hydroban on top.

Watching the Hydroban video on Laticrete website, it said don't fill or tape 1/8 inch gaps (I assume between boards) but to fill it with Hydroban.

Questions
1. I had just assumed I would thinset and tape all ~1/8-inch (an 8d sinker diameter) joints between Hardiebacker, but now I'm confused. Does Hardiebacker (in non-freezing California climate) need expansion joints?

Answer: gaps between panels are ok to fill with thinset. Concrete expansion joints should only be filled with Hydroban.

Thanks,
Darrel

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Hammy
02-07-2010, 07:20 PM
question: why are you water proofing the floor? Just curious.............. Hammy

darrelstickler
02-07-2010, 10:04 PM
It's an upstairs deck, outside.

Shawn Prentice
02-07-2010, 10:11 PM
Not over a living space, is it?