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Roof penetration
A roof penetration is anything that passes through the roof, like a vent pipe, chimney, or skylight.
Why it matters
Penetrations are high-risk leak points. Good flashing details matter more here than almost anywhere.
Where people get this wrong
Sealant alone is not a long-term plan at penetrations. Small cracks at penetrations can leak for years before you notice.
Real-world example
A small stain forms on a ceiling near a bathroom vent. The fan is fine. The roof penetration flashing is often the real source.
Where this hits your build
This affects how your home handles water. Water damage is one of the most expensive problems to fix, and it often starts with details that seem small.
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