Final answer:
a. To allow the rain water to drain out of the 1" air space. Weep holes serve the purpose of allowing rainwater to drain out of the 1" air space and balancing the pressure on both sides of the brick.
Step-by-step explanation:
Weep holes serve the purpose of allowing rainwater to drain out of the 1" air space and balancing the pressure on both sides of the brick. They are small openings or gaps typically found in construction materials such as bricks and mortar. By providing an escape route for water, weep holes prevent water buildup and potential damage.