What is a parapet and why is it significant to roofing?

What is a parapet and why is it significant to roofing?

• A. A vertical wall that increases wind uplift
• B. A low protective wall around the edge of a roof; requires proper flashing to prevent leaks
• C. A drainage gutter on flat roofs
• D. A type of roof covering

Answer: (B)

A parapet is a low protective wall that runs along the edge of a roof. Its significance in roofing comes from how water behaves at that edge: the joint where the parapet meets the roof deck is a prime entry point for leaks. That’s why proper flashing is essential—base flashing at the parapet-roof interface and counterflashing behind the coping must be installed correctly to seal the joint and keep water from migrating behind the wall. The top coping protects the wall itself, but without well-executed flashing, moisture can seep in and cause damage inside the building.

A parapet is a low protective wall that runs along the edge of a roof. Its significance in roofing comes from how water behaves at that edge: the joint where the parapet meets the roof deck is a prime entry point for leaks. That’s why proper flashing is essential—base flashing at the parapet-roof interface and counterflashing behind the coping must be installed correctly to seal the joint and keep water from migrating behind the wall. The top coping protects the wall itself, but without well-executed flashing, moisture can seep in and cause damage inside the building.