Welcome, Judy.
It'll help if you'll add that geographic location to your User Profile to help in answering some types of questions. Having it in only one post ensures it will be lost at least by the time we leave this page.
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Originally Posted by Judy
The cracks are level, but not quite closed (nothing over 1cm).
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Not sure about Oklahoma, but even in Texas a crack that wide would be considered huge. I'll wait for the photos. And when you say they are level, that needs to be an absolute. You want to be sure there is not even the tiniest bit of height difference from one side of the crack to the other. I'm not an earthquake guy, but if you know for sure the cracks occurred during such an event, I'd be really surprised if there is not some height differential after a couple years.
If there is no such differential, and
if that one-centimeter measurement is an error, there are a couple ways to look at crack isolation membranes. You could say, "Goodness, that's a lot of money for something I can't see and doesn't even come with a guarantee," or you could say, "Well, considering what I'm spending on this tile installation, that might be good insurance if it protects my tile."
But I'll wait for the photos and drawings and see if it's gonna be reasonable for you to use sufficient soft joints in your tile installation to properly honor those cracks.
My opinion; worth price charged.
Senior Contributor
