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kevjob
12-03-2005, 11:46 AM
wondering if 3/4 inch ply with 1/2 inch ply opposing seams glued then 1/4 inch mortar under 1/4 inch hardy-backer then meduim bed mortar for 12x12 travertine is enough flooring so no cracking?

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flatfloor
12-03-2005, 01:12 PM
Whats the joist system and longest unupprted span ? Run it through the deflecto.

T_Hulse
12-03-2005, 02:37 PM
Yep it should be just fine, only if the joist deflection exceeds l/720. Let us know if you need help using the Deflectolator.
I use Ditra on those because of the height & because I think it does better crack isolation (it's flexible) than CBU; and you don't need any more strength with the 2 layers of plywood.

kevjob
12-03-2005, 02:46 PM
thanx for all the input yeah i like ditra too.

T_Hulse
12-03-2005, 02:51 PM
If you glue the 2nd layer of plywood, use full spread glue or glue-like mortar. No beads of glue allowed. They hold the plywood up, creating voids & imperfect contact.

John Bridge
12-03-2005, 03:04 PM
Kev, Remember to check our deflectolator for allowable joist deflection. Ditra is a good call. ;)

kevjob
12-03-2005, 03:27 PM
what about mud bed application here how thick does it need to be i ve floated pans before and smaller baths?