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Unread 01-21-2012, 02:53 PM   #5
TechHead
Tile nub
 
Join Date: Dec 2009
Location: Apple Valley MN
Posts: 113
I'm not a pro but, from engineer Bob's pdf on thermal loss over a slab, 1/8" of cork made heat loss neutral. Usually in non slab situations people dont worry about it.

Stone (travertine) has the highest requirement for minimal deflection. 19" on center doesn't sound like a promising start. Engineered joist is a plus usually, small area is a plus, direction of joists in this small area my be another plus.

Travertine is a pretty soft and porous stone, using it in an area that will often get wet and be cleaned often with a variety of cleaning agents may be asking for more trouble.

Are you sure you cant be just as satisfied with a porcelain travertine look alike that would greatly relax the deflection requirements and prove to be much more durable?
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