I have a manufactured home with OSB subfloor, to install another subfloor for hardwood would cause a lot of problems. I want a continuous floating floor with no transitioning pieces and I want to know what are the common problems. Is it done in long, continuous installations? The length is 28' ft x 22' ft (living & dining) reducing to 13' x 17' (kitchen) and then to 8' x 10' laundry, then to 16'x 3' foyer.
The problem is expansion of the floating floor from seasonal moisture changes**. Transitions provide expansion joints. If you have excessively long continuous flooring, without large expansion joints at the ends, then when it gets humid your floor will expand, not be able to push outwards at the ends, so will push upwards in the middle instead.
** My thanks to DA01 for his comment on this. I'd always assumed it was thermal expansion.