Mile High wrote:
yes the floor. The slide floors were kind of disappointing in our Montana. They were mush around the dining table
There are a lot of residences that have 3/4" OSB used in the sub-floor and/or sheeting on the roof. In any construction method I don't see the benefit of using a heavy marine grade plywood product instead of regular plywood or OSB, unless the material could be exposed to the elements.
If floors around a dining room table were "mush" then that area was no doubt water damaged. The only way that water damage can happen in most fivers is either the slide wall/roof is leaking or someone left windows open several times and kept getting their floors soaked.