The '02 and '05 Montana brochures both refer to structure wood with a 25 year warranty. I remember that during our tour of the plant, the guide gave the warranty on the structure wood as one reason that Keystone choose to use it over plywood that has no warranty. The other reason was that it is available in sizes that allow for one piece-floors that do not squeak at the joints like plywood does. I can't easily get at our trailer documents right now to see what the Mfr warranty says. Over and above anything written in any warranty is the manufactuer's willingness to fix things that are wrong that are not the customer's fault. While I have never heard of a problem with the flooring, there are other examples of situations where Keystone has made repairs long after the written warranty has expired.
Personally, I am not too worried about it, but if you really want to get to the bottom of it, call Keystone Customer Service and ask them about it.
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