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Unread 04-09-2021, 05:45 PM   #13
openhand
Gandolf
 
Join Date: Apr 2013
Location: VT
Posts: 41
Underlayment Questions

Can someone tell me a rule of thumb for picking the right underlayment at a lumber yard for applying Ditra and then tile to? CDX plywood? Avantec? etc. I still don't understand what the stamps on plywood mean. And can we keep it simple? I'm trying to upload an image of the stamp on the 5/8 ply this bathroom floor was set on. It had been there since the 80's and it was murder to get the tile off. No decoupling membrane yet no cracking anywhere. Also no evidence of moisture infiltration, but the radiant tubing under the subfloor may have been a player in keeping the materials dry over the years?
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