Hi everyone

I want to install 12x12 marble tile in the kitchen area and wanted to know if my floor can handle it and what needs to be done for it to handle it

floor has 14ft spans with 16" OC joists joists are I joists and subfloor is 19/32" engineered OSB

thanks

more pics http://farm4.static.flickr.com/3142/2912967167_d67b9f2158.jpg?v=0
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http://farm4.static.flickr.com/3117/2913813492_4a64c1cd73.jpg?v=0

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You would have to have a truss joist engineer spec out the actual deflection of your floor. Basically in the past TGI floors where spec'd with a deflection rating approx. around 450 to 480. Not enough for stone.

Schluter has a spec for natural stone over TGI floors which would work.
Their spec requires a subfloor layer of 3/4 and then a min. 3/8 underlayment layer. I personally don't think the 3/8 is enough. I would use a minimum 5/8 underlayment.

TGI floor systems have a lot of vibration (flex) and you need all the help you can get, especially for stone.

I know this is an old posting, but I recently came across a company in B.C. that produces a product called IBS2000 to reduce deflection and bounce in TGI floors. Check out there site at www.luxorcorp.com I've never personally used the product, so I can't vouch for them.