How to Prevent Sagging & Sinking Decks

Before you dig your frost footings, you will want to make sure the soil is properly compacted to support the deck load. Often when new houses are built, the process of digging the foundation disrupts the soil and leaves the yard unsettled. This means the entire yard will slowly drop in elevation relative to the house.
It is not uncommon for this to cause patios and driveways to crack. Likewise, if you anchor a deck to footings that are built on soil that is not properly compacted, your deck will probably sink. Needless to say, this is something you want to avoid. If you suspect your soil is unsettled, you will either have to wait for the yard to settle or dig the footings to a depth where the ground is compact. Certain kinds of soils are more problematic than others. Clay soils are particularly prone to shrinking and swelling. If you live in a new house, you may want to talk to your builder or local building inspections department to see if they have any information or suggestions. You can mark the level of the yard as it meets the house where you will be building your deck and observe it over a couple of months to see if you notice any change. If you have reason to believe settling may cause you problems, you may consider hiring a soil engineer to assess the situation, but this will result in an added cost to your project.
Cutting a Concrete Pad
Learn how to use a concrete saw to cut a hole in a patio slab to install a deck footing.
Can I reuse existing footings
Our inspector discusses the topic of reusing footings for a new deck.
Monolithic Pier
Compare the pros and cons of installing a solid concrete deck footing using a cardboard tube or engineered forms.
How to Decorate Deck Support Columns
Browse some examples of decorative deck support posts for tall decks.
How to Brace a Swaying Deck
Learn how to install a diagonal brace on your deck frame to prevent racking. Check out our detailed image.
Reinforcing Deck Rim or Band Joists
Learn a technique to strengthen your guard rails by installing a double rim joist and adding structural blocking to reduce bounce.
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?
Avoid a wobbly deck! Learn how to calculate the right number of footings to keep your structure safe and solid.
Deck Bracing
Learn how to install knee bracing in-between your deck support posts to provide extra strength against high winds and to prevent racking forces for tall decks.
Footing Size
You don’t need to be an engineer to figure out what size footings your new deck will need to safely support it. Everything you need to know is right here.
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.
Engineered Deck Beam
Use treated engineered deck beams for long spans with fewer posts and footings. Engineered beams can be designed and specially ordered from your lumberyard.
How to Install Deck Girder, Cantilever or Drop Beams
Learn about the pros and cons of installing a cantilever, girder or drop beam to support your deck joists. This method allows for a notched post-to-beam connection.
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