Why Decks Fail: The Deck Ledger Board
The ledger board holds about half your deck. Learn why bad ledgers fail, the warning signs, and how The Great House fixes them in Northern Virginia.
OUTDOOR LIVING & DECKS
11/18/20263 min read
ASK MASON · DECK
Why Decks Fail: The Ledger Board You’ve Never Noticed
Mason shows how the ledger holds your deck to the house, the warning signs, and how we fix it.
One of the most common causes of deck failures is a single board you’ve probably never noticed: the ledger.
Watch Mason’s video, then read what the ledger does, the warning signs, and how we fix it.
01
What Mason Checks
The Board That Holds Your Deck to the House
THE LEDGER
The board bolted to the house.
HALF THE WEIGHT
Carries about half the deck and everyone on it.
BOLTS + FLASHING
Real bolts, plus metal flashing to keep it dry.
The board bolted to your house is the ledger. It carries about half the weight of your deck, and everyone standing on it.
That’s why it needs real bolts, not just nails, and metal flashing on top so rain can’t soak the wood behind it.
Many decks were built with nails and no flashing.
Mason’s diagram: the ledger board carrying about half the deck’s weight
Nails alone aren’t allowed to hold a ledger, for good reason.
02
Warning Signs
Warning Signs at the Ledger
RUST STAINS
Rust running down under the bolts.
SOFT WOOD
Spongy wood at the ledger or rim.
A GAP
A gap opening between deck and house.
Rain runs behind the ledger every time it storms. The wood stays wet and rots, and the bolts rust and loosen.
One day, under the weight of a crowd, the deck can pull away from the house.
Check this today
From under the deck, look at the ledger: you should see bolts or lag screws, and metal flashing above it. Poke the wood with a screwdriver; it shouldn’t sink in.
03
How We Fix It
A Repair Now, or a New Deck Later
We support the deck and inspect the ledger and the framing behind it. We replace rotted wood, install new flashing, and fasten the ledger with proper bolts, the way the code requires.
Caught early vs. caught late
Caught early, it’s a repair. Caught late, it’s a whole new deck, or worse.
In Northern Virginia
Code prohibits fastening a ledger with nails alone. Fairfax County’s deck guide also prohibits lead anchors and fastening through brick veneer, and requires continuous flashing on wood-frame walls. We fixed this on the rear deck of our Ridgeway Dr renovation in Springfield.
Planning a bigger project?
Building or replacing a deck? We bolt and flash every ledger to code, with a permit and inspections. See prices and real projects on our deck and outdoor living page.
The fix: new ledger wood, real bolts and metal flashing
ASK MASON · DECK
Want to know another problem?
SPOTTED ONE OF THESE SIGNS?
We’ll check it before it turns into a big repair
Free in-home visit from a Class A licensed team. We check the problem and the rest of your deck, then give you a clear written plan.
ABOUT THE AUTHOR
The Great House team
Written by the team at The Great House LLC, a Class A licensed builder and remodeler in McLean, VA (License #2705197237). We have renovated 30+ Northern Virginia homes since 2022.
PLANNING A PROJECT?
Our deck and outdoor living service
See prices, real photos and how we work: our deck and outdoor living page. Real projects: our project gallery.
Serving McLean, Vienna, Great Falls, Fairfax, all of Northern Virginia.