TL;DR
A flashing pan is the waterproof tray formed at the bottom of a window or door rough opening — site-built from flexible flashing tape or purchased as a rigid one-piece sill pan — that catches any water leaking past the unit and drains it out over the weather barrier instead of into the framing. Building codes and window manufacturers now require sill pan flashing on new installs, with back dams keeping water from spilling inward.
What it means
A flashing pan is the waterproof tray formed at the bottom of a window or door rough opening — site-built from flexible flashing tape or purchased as a rigid one-piece sill pan — that catches any water leaking past the unit and drains it out over the weather barrier instead of into the framing. Building codes and window manufacturers now require sill pan flashing on new installs, with back dams keeping water from spilling inward. Rotten subsills under leak-prone sliding doors are what this detail exists to prevent.
Where it sits in the glossary
Flashing pan is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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