Roof structural failure is most commonly caused by moisture intrusion, untreated dry rot, failed flashing, improper roof installation, and long-term exposure to heat and weather.

Structural roof damage includes compromised roof decking, rafter tails, fascia boards, barge rafters, or other load-bearing roof components that affect the stability and integrity of the roofing system.

Dry rot usually causes wood to look brittle, cracked, and shrunken with a “cubical” cracking pattern. Termite damage, by contrast, leaves behind mud tunnels and hollowed-out wood with a chewed appearance.

Common causes include water leaks, poor ventilation, clogged gutters, and improper flashing. Once moisture is trapped in wood, fungi can begin growing and spreading rapidly.

Dry rot is a type of wood decay caused by fungi that thrive in moist, poorly ventilated areas. It breaks down the structure of wood, making it soft, crumbly, and structurally unsafe.