I'm in the middle of remodeling a house. After ripping up carpets, hardwood, and laminate floors throughout the house, i see quite a few areas where the subfloor needs repair (I expected this)..
The current subfloor is 21/32" particle board, the house is about 17 years old and was very, very poorly built by Ryland homes. In the family room there is a sliding glass door that was apparently leaking, most of the water damage is to the left of the door, all the way into the corner with the adjacent exterior wall, this is right up against the framing.
Where the water damaged areas are up against the exterior walls, and the framing sits on top of the subflooring, what is the best way to go about replacing the flooring? Obviously I'm not going to jack up the bottom plate to remove the old subfloor and slide in a new piece, so do I just cut it at the bottom plate and lay new subfloor down? Does this in any way alter the structural integrity of the wall if I'm cutting the subfloor at the bottom plate?
When this is all done I'll be laying down hardwood flooring in most rooms with ceramic tile in the kitchen and bathrooms, should I step up to 3/4" plywood and replace all of the subfloor throughout the entire house? Should I just replace the rotting particle board with more 21/32" particle board? Or should I replace the rotten sections with 21/32 plywood leaving a mix of particle board and plywood as the subflooring?
Where the interior walls sit ontop of the existing subfloor, do I again just cut at the sole plate of the wall? If I replace all of the subfloor, following this method, all of the walls would be sitting on a piece of 21/32 particle board that is cut at the sole plates on all sides, again, would this alter structural integrity of the house?
Thanks for the help