DIYbanter - View Single Post

wrote:

I was thinking about 1". Could I get away without a concrete board underlay
if its a single piece?

Maintaining some context is good...

iirc, granite is ~160 lb/ft3 so you're talking about 250 lb. Is the
subfloor strength and rigidity up to that much weight? IF (that's the
proverbial "big if") you have a solid subfloor and it's level (and you
can muscle it into place) you should be able to get by...