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Re: 2 post lift near shrink cracks??
The only sure way to tell if its the skin cracking when it dried would be to rent a core drill and cut a core over the crack pull it up and see how deep it goes. You can them make your decision and just plug the hole. A 2" core would be more than enough to see whats up. It should only take about an 1/2 hour to drill and pull the core. Yo will also know exactly how thick your floor is.
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