1/2 Hardibacker Floor?

[G. Mark Stewart]

Well, thanks for all the input folks. I've got a pretty good idea on how to proceed.

Mark

[G. Mark Stewart]

I'm a little lost here -- what else could it be? Surely no one uses the backer board without a decent sub-floor under it, right? Like I said, if there's some detail you need that I've left out, I'll do my best.

All I have is a first impression that he, as well, should seek out the help of a pro.

But tantrums aside, I'm curious about a couple things. Firstly, I didn't see anything on the Hardie website to indicate that 1/2 was weaker than

1/4. In fact, the brochure in the store stated that 1/2 was dimensioned to replace 1/2 sheetrock, and 1/4 was dimensioned to minimize the rise of the floor surface, no other indications.

Secondly, it seems to me that adding the 1/4" to 1/2" and gluing is less strong than a single 3/4" layer. But that this is assuming that the glue used is weaker (more sparsely applied) than the bond between layers of plywood. Am I right or wrong, here?

TIA!

Mark

[Randy Calhoun]

Go back to their site and look at specs. Strengths are given there.

What's the dif? Adding the 1/4" to 1/2" still produces an inferior substrate for ceramic.