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n175h 12-09-2011 08:50 PM

ditra over plywood
 
I've been reading up on this stuff and am pretty impressed. I'm confused, however. Some contractor forums say to lay down the mat and let dry over night. Ditra installation instructions say you can lay tile over the mat as you lay the mat down. http://www.schluter.com/5793.aspx.

Are both correct and just different techniques of personal preference?
The instruction also states, "use a thinset suitable for the substrate." What does that mean? My subfloor has VCT stuck down with cutback adhesive which I'm sure will have asbestos. I haven't attempted removal yet, but in the past this stuff has been a bear to remove. I've done some where plywood strands come up with the tile.

I think I'm in for a big job and sore back. It's about 220sqft.

Bud Cline 12-09-2011 09:24 PM

Remove the vinyl then modified thinset can be used to install the DITRA.

You can get back on the DITRA to install tile right away but why would you want to. Why risk and compromise the bonding of the DITRA to the substrate.

Vinyl is generally installed with a 1/4" plywood underlayment. See if this is the case with your vinyl. If so, remove the 1/4" plywood at the same time you remove the vinyl. It's a lot easier to remove that way. Locate the seams in the plywood and cut the vinyl along the plywood seams then pry it all out at the same time.:)

n175h 12-10-2011 01:58 PM

Quote:

Originally Posted by Bud Cline (Post 790142)
Remove the vinyl then modified thinset can be used to install the DITRA.

You can get back on the DITRA to install tile right away but why would you want to. Why risk and compromise the bonding of the DITRA to the substrate.

I was thinking that, too, but their website says you can do it immediately. I'll wait overnight.

Bud Cline 12-10-2011 02:09 PM

Quote:

I was thinking that, too, but their website says you can do it immediately.
Well then jump on it if that's what you think is best, do it immediately.

n175h 12-10-2011 02:54 PM

Quote:

Originally Posted by Bud Cline (Post 790583)
Well then jump on it if that's what you think is best, do it immediately.

I think it's a bad idea, but Ditra seems to like it.


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