I recently had a leak in my water heater that flooded an entire apartment that I own. The apartment was empty at the time and it seems like the water level did not exceed the height of the floorboards (~1.5 to 2 inches). The floorboards and some walls have developed mold. I plan on removing the floorboards, but my question is how much drywall do I need to remove to address the problem. There are some walls that clearly need to go. I'm concerned that the soaked floorboards damaged the bottom few inches of the drywall throughout the apartment.
I read online that you should remove up to 12 inches of drywall above the water line mark. That sounds like the most conservative way to approach the problem and ensure no future problems. However, a general contractor friend of mine who is also a certified mold inspector states that it is not necessary to remove so much drywall - only the obviously damaged parts. What say you all? Thanks in advance