Decided to install hardwood and was told the particle board subfloor had to be replaced with plywood.
The subfloor obviously runs beneath the walls and I was wondering how close to the walls I should cut to remove the subflooring and with what tool? If you leave 3-4 inches of PB around the perimeter of the room wont that pose a risk of the hardwood lifting in those areas? I was thinking of just dropping plywood over the PB but would cause a transition problem with the hallway.
I have attached a picture of the subfloor as I dont understand this construction technique and I was hoping someone might know. My guess is it's an expansion joint but I have never seen this used before in a house.
The builders left a 1 inch gap between 1 row of PB sheets and toenailed in a 1x2 into the gap. This runs the entire length of the room. In the photo I chipped away some of the leveler to see what was beneath.
The framers then proceeded to literally dump in floor leveler to conceal the gap but ended up making a small speedbump under the carpet.
Any ideas and if so should I copy this with the ply?
Sorry for the long post. Just trying to get as much info as I can without asking too many questions.