Water heater venting pipe flaking
I had no idea this was happening until I stuck my head behind the pipe to find out why there are metal flakes on the ground.
2. Is this normal wear and tear?
3. Why is this happening and how do you prevent this from happening?
4. How do I know if the venting pipe is not flaking behind the walls?
5. What's the approximate cost to fix this and which trade fixes this?