deflecto and marble tile

[handy_guy]

Hi All;

I have a question regarding installing mosaic tiles in a bathroom.
The floor is 1.5x7" joists, 16" O/C, 10.5' span. Deflecto says ok for ceramic but not natural stone. I will be putting 5/8" ply over the planks/joists and 1/4" hardiebacker over that. The tile is a marble mosic, with components of 1x2" and .5x.5", about 3/8" thick. With such small components, am I ok with the installation, or do I still need to somehow beef up the floor?

Thanks for your help!
Barry

[Brian in San Diego]

Stone is stone. I have never read anything that gets one "off the hook" if the size of the stone is smaller than a certain size. Perhaps the individual pieces of stone wouldn't crack but I bet the grout would.

Brian

[John Bridge]

I NEVER disagree with Brian, but in this case I think the small pieces of stone are more like ceramic mosaics than anything else.