To limit the probability of the premature failure of chimney saddles under expected structural or environmental loads, which could lead to precipitation or meltwater ingress into or through roofs or chimneys, which could lead to damage to masonry or to chimney liners from freeze-thaw stresses, which could lead to the premature failure of chimney liners, which could lead to carbon monoxide gas leaking into living space, which could lead to the acute poisoning or asphyxiation of persons.