Types of Deck Flashing
The IRC code requires that you install approved corrosion-resistant flashing in a shingle fashion to prevent water going into the wall cavity. The flashing shall extend to the surface of the exterior wall finish.
Corrosion resistance is defined as the ability of a material to withstand deteriorization of its surface or properties when exposed to its environment.
Deck flashing creates a barrier to prevent moisture from entering the house in the openings you create when attaching your ledger board connection.
You can buy flashing either in roll form or in rigid Z- or L-shaped 10' sheets made of stainless steel, copper or vinyl material. Never use galvanized steel or aluminum flashing in contact with an ACQ pressure-treated wood ledger board because it will corrode. Vinyl flashing is the least expensive option, but it may not work as well in areas with extreme temperature fluctuations. If you are installing copper flashing from a roll, make sure you use copper nails to secure it into place to prevent corrosion. Copper works well because it is compatible with the chemicals used in commonly sold ACQ-treated lumber and is easy to bend. Because flashing comes in different widths, make sure your flashing will be the right size to tuck up behind the house siding at least a couple of inches. We recommend that you install a bead of silicone caulk to fill any openings.
Attaching the Ledger Board to the House Rim
Learn how to properly install a waterproof ledger board using flashing and fasteners. Check out our step-by-step video and detail drawings.
Framing Around a House Cantilever
Learn a technique for framing around a cantilevered house bay to properly support your deck.
Removing the Siding
Learn how to cut and remove aluminum, vinyl, wood and cement board siding for installing a deck ledger board to a house wall.
Pressure Washer Buying Guide
When it comes to cleaning your deck, it's important to choose the right pressure washer. Use this pressure washer buying guide from Decks.com to help with your decision!
How To Fix Loose Deck Railing and Prevent Wobbly Banisters for Years
Learn how to fix a loose outdoor railing on your deck to avoid future damage.
How to Avoid, Prevent & Repair Deck Joist Rot
Rotted deck joists can cause homeowners headaches. Learn more about how to avoid, prevent and repair deck joist rot at Decks.com.
More Helpful Resources
Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights
what if my deck has no flashing
Our inspector discusses what you should do if you deck ledger board isn't properly flashed.
Removing Stucco Siding
Learn how to cut through stucco siding to prepare a house wall to install a deck ledger board.
Framing Around a House Cantilever
Learn a technique for framing around a cantilevered house bay to properly support your deck.
How to Remove Scuffs and Scratches from Composite Decking
Removing scuffs and scratches can help make your composite deck look like new. Learn how to fix and prevent your composite deck from future scratches.
Average Cost to Stain a Deck
Find the national average costs for staining and sealing a deck per square foot, including sanding and power washing prices. Learn more at Decks.com
How to Replace Deck Boards & Repair Your Deck
Deck boards can split, rot or come loose over time, but it’s easy to remove and replace deck boards without rebuilding the whole deck. Learn how from the experts at Deck.com.
Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights