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Unread 01-03-2020, 03:47 PM   #2
Kman's Avatar
Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 11,280
Welcome to the forum.

I would agree with the first contractor. With concrete, it's not a matter of "if" the slab will crack, but "when".

HOWEVER, Ditra is not a crack isolation membrane, so to prevent any future cracks from damaging the tile, you need a membrane that has been tested and proven to prevent cracks from transferring to the tile surface.

One such product is Laticrete Stratamat. It installs and functions much like Ditra, but will absorb movement from cracks up to 1/8" wide.

I assure you that the amount of heat lost through the plastic membranes is negligible. And even if it did lose some, it would be better than having a future crack damage a number of tile, requiring replacement.

The top ten reasons to procrastinate:

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