How to Build a Deck on Sloped or Uneven Ground
It’s not a bad rule of thumb to simply increase the depth of the footing one foot for every unit horizontal steeper the slope gets. Between 3:1 and 2:1 slopes, a minimum of two feet deep, and between 2:1 and 1:1 slopes, no less than 3 feet deep. For slopes steeper than 45 degrees, consulting an engineer may be the best choice. Beyond this generalization, you also need to consider if the soil is unstable, loose or sandy. In these cases, the lateral stability for the footings is even worse, and a little more depth is likely necessary to assure they don’t slide down the hill.
Cutting a Concrete Pad
Learn how to use a concrete saw to cut a hole in a patio slab to install a deck footing.
Protecting From Collapse
Learn how to use cardboard sonotubes and hole covers to protect your deck footing holes from caving in and flooding before pouring concrete.
Do I need to use rebar?
Our inspector discusses using steel rebar for deck footings.
How to Decorate Deck Support Columns
Browse some examples of decorative deck support posts for tall decks.
Deck building tools
As with any professional job, having the right tools can make all the difference.
How to Use a Triple Deck Beam to 6x6 Post Connection
Learn how to use a post beam connector to attach a 3-2x10 beam to a support post for a deck when there isn't enough material on the post to create a notched connection.
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
How many footings do I need?
Learn how to determine the number of footings and support posts you need for your deck when designing your deck frame.
Protecting From Collapse
Learn how to use cardboard sonotubes and hole covers to protect your deck footing holes from caving in and flooding before pouring concrete.
Layout Deck Foundations
Learn how to lay out your deck footings accurately using triangulation with our step-by-step instructions.
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.
Deck Blocking: Bridging, Spacing, Methods, and How to Install Like a Pro
Learn the importance of deck blocking and how to install it when building your deck.
How to Use Steel Metal Deck Support Posts and Columns
Steel deck posts with base plates can be used as an alternative to wood posts for supporting your deck.
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