Intent 1:
To limit the probability that:
- contact with flue gases will lead to corrosive damage
to mortar, or
- flue gas condensate will leak from joints in chimney
liners, which could lead to corrosion or freeze-thaw damage to surrounding
masonry.
This is to limit the probability of
the leakage of carbon monoxide gas into living space, which could
lead to the acute poisoning or asphyxiation of persons.