9.20.13.1.(1)

Intent 1:

To limit the probability of using inappropriate flashing materials or installing an inadequate thickness of flashing, which could lead to premature failure of flashing upon exposure to moisture, sunlight, temperature extremes or mechanical stresses.

This is to limit the probability of precipitation or meltwater ingress, which could lead to:

• deterioration of masonry due to freeze-thaw stresses, which could lead to masonry falling, or
• the deterioration of elements inboard of the masonry, which could lead to compromised structural integrity, which could lead to structural collapse.

This is to limit the probability of harm to persons.