After removing the tile in my bathroom, it appears to have a 1/2" plywood upper floor over a lower plywood layer of unknown thickness. Does this sound right? Is that a common construction method?
The upper layer of plywood is damaged in one section, due to water exposure (that problem has been fixed.) I want to replace the damaged area. I need to remove an area of at least 1' x 2' but leave the lower plywood layer intact. I need to cut it right along the wall. What kind of tool(s) will I need to cut the upper layer without damaging the lower? I regular circular saw won't get close enough to the wall.
Here's a small graphic showing the area. I want to remove some of all of the area within the dotted red line: