TL;DR
Ledger flashing is the layered metal or membrane assembly that waterproofs the connection between a deck ledger and the house, typically a piece tucked up behind the water-resistive barrier that laps over the ledger's top, with a drip leg kicking water clear of the board's face. Done right, it keeps the band joist dry for the deck's life; omitted, water sits in the wood-to-wood joint and rots the very framing holding the bolts.
What it means
Ledger flashing is the layered metal or membrane assembly that waterproofs the connection between a deck ledger and the house, typically a piece tucked up behind the water-resistive barrier that laps over the ledger's top, with a drip leg kicking water clear of the board's face. Done right, it keeps the band joist dry for the deck's life; omitted, water sits in the wood-to-wood joint and rots the very framing holding the bolts. Codes require corrosion-resistant materials, and copper or coated metals matter against treated lumber chemistry.
Where it sits in the glossary
Ledger flashing 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
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.