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Yes, they're dry-laid and as far as freeze thaw is concerned, I've never had a problem with that. Long Island doesn't really get a deep or extended freeze, so it's really not an issue.
I see that you're in zone 4. Deep freezes are probably more of an issue for you. But don't forget that the whole purpose of dry-laid pavers is to move with the ground and not to remain completely stable. If we ever did get a bad freeze and they lifted, I'd simply wait until spring and arrive with a plate tamper and set them down again.
-JP
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Any activity becomes creative when the doer cares about doing it right,
or doing it better.
- John Updike
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