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Old 03-16-2019, 07:49 PM   #1
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Tar Paper?

A buddy of mine is pulling up tile in his house to replace the flooring. It is new home construction in Florida, Slab on Grade. He said the tile is coming up pretty easy but he is finding that in some areas of the house there seems to be tar paper between the thinset and slab - not whole rooms 0 just a few swuare feet here or there. There is no rhyme or reason to it that he can tell. It is in multiple rooms but not over a whole room, just patches here and there. In one area it covers part of an expansion joint but not the whole joint, just a section. Anyone know why the builder would have done that?

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Old 03-16-2019, 09:10 PM   #2
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It's hard to know what was in the contractor's mind. It could be a cheap crack isolation membrane attempt. That is not a TCNA approved or recommended action, but lots of things in FL are done that aren't!
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Old 03-16-2019, 09:12 PM   #3
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That was done years ago to isolate the tile from the slab. I can't imagine that it worked, though.

He may find some cracks when all the dust is cleaned up.

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Old 03-16-2019, 09:50 PM   #4
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Yeah, I remember hearing the same thing, seems like it was back in the 80's. Some guys would use mastic under the felt paper. They would put it over slab cracks.

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Old 03-17-2019, 12:58 AM   #5
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Yep, I’ve heard the same. Makeshift, cheap crack isolation membrane.

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Old 03-17-2019, 08:58 AM   #6
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Things like that seem to be either in SoCal or Florida.
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