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.
what if my deck has no flashing
Our inspector discusses what you should do if you deck ledger board isn't properly flashed.
Checking House Framing
Make sure your house frame is solid and in good condition before installing a deck ledger board. We list some problem areas to look for before building.
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!
Best Deck Cleaner Options
Discover the best deck cleaning and brightening solutions for composite decks, wood decks, and more. Learn how to remove dirt, mildew, and algae with Decks.com.
How to Remove Paint from a Wood Deck
Aiming to refresh your deck with new paint or sealer? Learn the easiest and fastest methods of stripping paint from your wood deck with 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
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.
Ledger to engineered floor joists
Explore your options for building a deck onto a house with engineered floor joists.
Installing A Ledger Board Around A Corner
Follow our tips to properly install a deck ledger board around the corner of a house to keep water out.
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 Pressure Wash a Deck
Pressure washing your deck is the best way to keep your investment looking like new. Learn how to properly clean your wood deck with these tips from Decks.com.
How to Prepare & Protect Your Deck for Winter
Preparing and protecting your deck for the cold weather is important to ensure the longevity of your deck, especially in cold climates. Learn how to prepare your deck for winter at Decks.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