Removing subfloor

[Book]

Bought a home about a year and a half ago. They put a new addition on it about 8 years ago. Where the new addition starts, the first floor joist is high about 3/8" causing a crown in the flooring.

I want to rip up the complete subfloor and replace it. My question is this, the subfloor will be under the walls correct? Do I just go around the base of the wall with a saw and cut as close to the wall as I can to remove the subfloor?

Also, is 3/4" Tongue and Groove thick enough for a subfloor? Thanks in advance.

[Ed Imeduc]

My question is this, the subfloor will be under the walls correct? Do I just go around the base of the wall with a saw and cut as close to the wall as I can to remove the subfloor?

Yes --- As long as the walls run across the joist. But for sure not in the center like or run with the joist.

Also, is 3/4" Tongue and Groove thick enough for a subfloor? Thanks in advance.

Yes for sure and Id use liquid nail also to put it down with some nails.

ED ;)