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Trim Carpenter/Remodeler
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Need more info. Is this new construction meaning are you putting down the sub floor? If it's existing what type of floor are you covering. Is it exposed to the elements? As far as the mortar goes like mentioned, it remains flexible under freeze & thaw periods.
 
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Discussion Starter #4
Currently a section of floor that is to be tiled exists as a deck with treated 5/4 boards. The rest of the floor has not be constructed yet. The floor will be under a roof with screened sides, aka a screen porch. The current deck has 2x8 joists, 16" oc.
 

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indoor/outdoor carpet would look nice. It takes a lot of $ to do tile right. Extra sturdy floor,waterproofing membrane,flashing, sometimes a mud base is required.
 

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Way too many variables.
Sounds like a tear off and start again.
Although, shiney side up comes to mind. :laughing:
How about some pictures?
 

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With a single 2x8 you can only span 11'. Double the 2x8's can support tile to 14' span. Schluter has very good diagrams concerning exterior tile. Noble Dec is the membrane I prefer .
 

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Currently a section of floor that is to be tiled exists as a deck with treated 5/4 boards.
Yeah, scarifying those would add texture for the thinset to grip, but I'd still not recommend it. The board spacing alone could add to thinset grippage, like keying in of mud.

Are you in the keys or in the smoky mountains? Roanoke? Houston?
 

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Call up Schluter, the company that makes ditra, and ask them about tile in an "outdoor" space. They will have a bunch of advice to give you.
 
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