How does proper flashing around skylights affect roof longevity?

How does proper flashing around skylights affect roof longevity?

• A. It creates a decorative finishing detail.
• B. It prevents leaks by sealing around the skylight and directing water away from the penetration.
• C. It increases roof weight.
• D. It eliminates the need for underlayment.

Answer: (B)

The main idea here is that flashing around skylights creates a waterproof seal where the skylight meets the roof and directs water away from the penetration. When installed correctly, the flashing wraps around the skylight flange, with appropriate components on the sides and top, and ties into the surrounding shingles or roofing material so water is shed rather than allowed to seep in. This prevents leaks that can lead to deck rot, mold, and interior damage, which in turn helps preserve the roof system and the structure beneath it, contributing to greater roof longevity. The function isn’t decorative, and underlayment still plays a separate role in protection. It also isn’t about adding meaningful weight, and it doesn’t replace the need for underlayment.

The main idea here is that flashing around skylights creates a waterproof seal where the skylight meets the roof and directs water away from the penetration. When installed correctly, the flashing wraps around the skylight flange, with appropriate components on the sides and top, and ties into the surrounding shingles or roofing material so water is shed rather than allowed to seep in. This prevents leaks that can lead to deck rot, mold, and interior damage, which in turn helps preserve the roof system and the structure beneath it, contributing to greater roof longevity. The function isn’t decorative, and underlayment still plays a separate role in protection. It also isn’t about adding meaningful weight, and it doesn’t replace the need for underlayment.