Roof Penetration
Any object or structure that passes through the roof surface, including plumbing vents, HVAC curbs, exhaust fans, skylights, and satellite dish mounts. Each penetration requires proper flashing.
What Is a Roof Penetration
A roof penetration is any object or opening that passes through the roof surface, breaking the continuous waterproofing layer. Every penetration creates a potential leak point and requires dedicated flashing to maintain waterproofing integrity.
Common Types
Residential roofs typically have 5 to 15 penetrations. Plumbing vent pipes are the most common, followed by kitchen and bathroom exhaust vents, HVAC equipment, and occasionally skylights or chimneys. Each type uses a different flashing method.
Penetration Flashing and Insurance Claims
Penetration flashing failures from storm damage are common claim items. Hail can crack pipe boots, wind can lift flashing collars, and debris impact can damage any penetration. Each damaged penetration needs its own line item in the scope with the correct flashing type specified.
Frequently asked questions
Any opening or object that passes through the roof surface is a penetration. Common examples include plumbing vent pipes, kitchen and bathroom exhaust vents, HVAC units, skylights, chimneys, and antenna or satellite mounts.
Every penetration interrupts the continuous waterproofing layer. The flashing and sealant around each penetration must be properly installed and maintained. Failed penetration flashing is the most common source of roof leaks.
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