We have a second floor bedroom that was added onto the old house a long time ago and it is 1.25" lower than the hallway. The bedroom currently has hardwoods.
What is the best way to raise the floor to meet the hallway hardwoods and install carpet? --- 2 layers of OSB plywood? is there a weight issue with this? --- Install sleepers and then a layer of OSB? --- leave the hardwoods and install a transition piece