We are in the midst of a major renovation. We had carpet and lino, going with hardwood and tile. We had K3 under all the lino. Our tile people said it had to come out, they would not put tile over K3. Big job but that is what you have to do. We were lucky, our K3 was not glued down, usually it is. Ours was put down with a gazillion of those extra long staples, so the demo guys still had a hard time getting it off, it still came off in small pieces. At least, without being glued and screwed, the plywood sub base was salvageable.
The tile people will now glue and screw a 3/8" plywood over the existing plywood sub base, some do 1/2" but the standard is 3/8" I guess. Then the tile will be placed over that.
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