Ditra Duo Thermal Break. Is it worth it?

[Shady at Best]

I am helping a friend finish his master bedroom and bath. This is the job that made me start this thread.
We installed the last 70 square feet of ditra heat duo. We decided to back butter the felt on hopes to lessen the hollow tile sound.
The duo was installed 4 days ago. We pulled up a 12" square area yesterday to repair a high spot. There was absolutely 100% adhesion.
So far there is 20 feet of tile that has dried for 24 hours. These tiles sound hollow just like the rest of the floor.

A word of caution. Don't use (Duo) if hollow sounding tiles bug you.

Travis, that is a very good idea!

[John Bridge]

I think I would just inform my customer ahead of time that the hollow sound is normal.

[CharlesInRichmond]

old thread, came across this randomly while checking something, but thanks for mentioning the hollow sound, it really is a thing. Been driving me nuts.

[speed51133]

i also get the hollow sound on my shower with a kerdi tray on a slab.

[Tiger Mountain Tile Inc]

FWIW, here's some feedback I received from a customer after using this product:

They said that it takes forever to warm up. It was installed over a concrete floor and in the Seattle area where it gets cold but not Minnesota cold.

In the photo below, you can see that the wire is a Suntouch wire ran at 2 pegs and the wire is ran over every bit of the floor.

I'm not saying this product doesn't work but I am saying that it may not solve the problem that one is hoping to solve. Probably, using a foam board underlayment as an insulator would yield better results.