Like many oily woods, Cumaru (Brazilian Teak) is very difficult to dry properly. While a proper pin meter will give what would normally be an accurate reading on many species, it doesn't take into account oils that are deep within the plank. Over time this oil migrates through the wood and right out of it, in fact. So the wood has lost "moisture" in a manner of speaking. It has therefore dried and shrunk. A normal moisture reading taken at install wouldn't have been accurate anyway.
We have had experience with this and many other oily species and most are bad news. Just because it's wood and makes a pretty floor doesn't mean it should be used that way.
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