Caulk to seal seams on OSB subfloor - Tile Advice

[michaeldwilson]

Long time listener, first time caller.

I have seen this both ways: Do you recommend sealing the seams between the 1/8 gap in the subfloor with caulk, or does this prevent the expansion/contraction of the wood? If caulk is used, what kind of caulk do you recommend?

Also, if someone can reassure me that a 3/4 OSB + 1/8 Ditra is enough to support tile, I would like to hear it. It seems so thin compared to the old plywood+Hardibacker.

Thanks!

 

[Josh Camden]

Would love to know this going through the same thing