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So, I attempted to install a ditra-heat membrane in a small bathroom last night and it didn't go as well as I had hoped.

I think either my mix was too dry or I tried to do too much at once, but either way some parts of the sheet seem well bonded, while other parts are not. I think my big mistake is not spending more time ensuring that the mat had 100% coverage. Overall, the mat is stuck to the floor, but there are "bubbles" in places where it's not. The edges, (with a 1 exception) are well bonded.

My question is... what do I do now?

Do I really need to rip it up and start over?

And if so:

  • What's the best way to remove the thinset from the floor?
  • Can I reuse the mat? Or will I need to order new material?

Tile guy is suppose to be here Monday so if possible I'd like to avoid starting over.

What likely happens if I do nothing?

Would it be a bad idea to just put some screws (with plastic washers) in where it's well bonded? I bought this product for the heating, not the waterproof capabilities, so I'm not concerned about that.

  • There are a couple of different types of "ditra heating membranes". Which system are you dealing with? What kind of thinset mortar did you use, specifically modified or unmodified?? What dimension would you give the smallest/largest bubble? What percentage of the total area is compromised? When you say you are not concerned about the waterproofing aspect, why not? Are just using the membrane to hold the wire? Can the tile guys mortar be thicker if it has to be? – 4Lexington Jan 5 at 19:30

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