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:

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

This is to limit the probability of damage to the building.