How to Use Shared Load Deck Support Posts
It if often practical to use a common post and footing to support two or more beams in a deck design. This usually happens in multilevel decks where a lower deck intersects with an upper deck along a line of posts and footings. Stair landings that wrap around the frame of a deck often take advantage of sharing a corner post.
Although this can be a great technique for reducing your quantity of footings for your project you must be careful to consider the types of compound forces you will be exerting on the post. A beam attached to the side of a post will be pulling out and down away from the post. You must maintain a minimum 1-1/2" beam bearing ontop of a post. In order to satisfy this requirement you will need to create a notch in the lower section of the post. Installing a cleat along the post below the beam can provide added stability and increased support.
Consider how large amounts of load applied from the side coupled with the downward force of the higher beam can overload the capacity for the post and don’t forget to adjust your footing size to accommodate the additional loading. Be sure to use the proper type and quantity of fasteners to prevent them from shearing off under the load. Using long ½” carriage bolts will work well in this application. Check with your building inspector.
How to Decorate Deck Support Columns
Browse some examples of decorative deck support posts for tall decks.
Joist Tape: What Is It and Do I Need It?
Dive into the benefits of joist tape and why you need it for your deck build.
How to Build a Multi-Level Deck
Multi-level decks are very popular. Learn how to build a deck that steps up or down using shared posts and footing connections.
Decking Patterns
Installing your decking at a 45-degree angle is a popular style for decks. This can be done to reduce decking seams or just for appearance.
Building an Outdoor Space with James DeSantis
Composite decking can not be placed directly on concrete. But a substructure can solve for this. Explore this deck project with James DeSantis
Best Hidden Fasteners for Decking
Hidden fasteners create a clean deck surface and can be used with composite, wood and other materials. Learn about hidden deck fasteners 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
Why is Joist Protection so Important for Your Deck?
If you’ve ever seen a piece of wood left out in the weather for any period of time, you know what happens: decay. Whether through wet rot, insect damage, or mildew, the fibers begin to break down.
How to Angle Corners and Joists
Learn how to frame a deck with angled or clipped 45-degree corners using a cantilever beam.
How to Build a Multi-Level Deck
Multi-level decks are very popular. Learn how to build a deck that steps up or down using shared posts and footing connections.
Building an Outdoor Space with James DeSantis
Composite decking can not be placed directly on concrete. But a substructure can solve for this. Explore this deck project with James DeSantis
How to Install Composite Decking
Learn about how to install composite decking. Topics include expansion and contraction issues and hidden fastener systems.
How to Demolish & Remove a Deck
At some point, it might become necessary to remove an old deck, due to age or condition. Learn more about what's involved in a deck demolition and removal project.
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