I looked at a property recently where a boiler flue (not combi) was exiting a wall above a concrete canopy - which was about 75mm thick
Directly below the outlet, the concrete canopy had a chunk missing. The missing bit looked like it has been hit and chipped off, but the edges of the concrete are not clean like a chip, but more smooth like erosion.
The flue pipe does not seem that old, maybe a year or two, so I wondered what were the chances of the cause being due to the acidic flue gasses condensing and dripping on to the concrete below?
Directly below the outlet, the concrete canopy had a chunk missing. The missing bit looked like it has been hit and chipped off, but the edges of the concrete are not clean like a chip, but more smooth like erosion.
The flue pipe does not seem that old, maybe a year or two, so I wondered what were the chances of the cause being due to the acidic flue gasses condensing and dripping on to the concrete below?