Attaching a Deck Ledger Board to Engineered Floor Joists
Floor truss systems are very different from conventional floor framing materials. Like a roof truss, floor trusses are created through joining standard lumber, typically 2x3 or 2x4, with metal connectors. The resulting, engineered product is a long-spanning floor joist - about a half to two times taller than a typical 2x10 - that is able to house HVAC ducts, plumbing and other service lines within the floor assembly. Floor trusses do not use a typical band (rim) joist around the edge of the floor, where ledgers are typically attached. They have to be handled differently. Technically, the straight and narrow answer is that an engineer must evaluate the floor truss system and design a connection method for a ledger. The other option is a freestanding deck or other method that avoids connection to the floor system altogether.
A slightly more relaxed approach would be to use the recommendations of the Structural Building Components Association (SBCA) in their document, appropriately titled, “Attachment of Residential Deck Ledger to Metal Plate Connected Wood Truss Floor System”. While a mouthful of a title, it provides detailed methods for doing exactly that, connecting a deck to a floor truss system. Five distinct connection details attempt to cover various configurations and methods for making the connection, including connections to wood and composite blocking, the ends of the trusses and the truss ribbon strip (a horizontal member similar to a band joist that connects the trusses together at the ends). Parallel and perpendicular orientations of the deck joists to the floor trusses are also provided. The general message is that it’s not a casual connection, and various considerations are necessary.
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.
Lateral Load Device
Learn about your options for providing lateral load support for your deck. We explain recent code changes affecting deck building.
Flashing the Ledger Board
You should flash your ledger before you install your decking. Over time, the house frame behind the deck will rot if it gets wet.
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 Ink Stamps from Pressure Treated Lumber
Ink stamps seen on pressure treated wood represents where the lumber came from and its grade. Learn a few tricks to remove this ink from your wood at Decks.com.
How to Restore & Refinish a Deck
Decks need maintenance. A twice-yearly cleaning is needed at a minimum. But wood decks—even with good upkeep—can still warp, rot, or get termites. Plus, no stain or paint job lasts forever. Fortunately, you can reset the clock by restoring your deck and refinishing it.
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Explore Articles by Topic
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Learn structural framing methods
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Ledger
Proper attachment techniques
Care
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what if my deck has no flashing
Our inspector discusses what you should do if you deck ledger board isn't properly flashed.
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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.
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.
How to Seal Your Deck & Best Deck Sealers
Once you clean or stain a deck, it is ready to be sealed. Learn how to properly seal your deck in order to protect it from damage caused by harsh climates and weather at Decks.com.
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.
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