Quote:
Originally Posted by MichaelP
Yeah I know that, When I did it originally, it was with 16x16" tiles and I doubled it already, but thanks for the advice 
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theres a lot more to finding out of a floor is stong enough for stone besides how good its "screwed down". whenever i get stuff done i have it glued and screwed. that doesnt mean anything though if you dont measure the deflection. you can calculate it here:
http://www.johnbridge.com/vbulletin/deflecto.pl
ask your tile installer about it though, if he doesnt know what you're talking about when you mention deflection then you should find another tile guy.