How to Use Concrete Footings for Deck Posts
Concrete is, in fact, the most used material for construction in the world and has been in use since the age of the Roman Empire. Concrete is a mixture of aggregate (sand and gravel) combined with water and cement. Depending on the ratio of these parts, the concrete can be stronger or weaker. Concrete hardens in a process known as hydration, which is caused by the reaction between water and cement. Adding too much water can weaken the concrete.
For most deck projects, it is practical to buy bags of premixed concrete that are prepared by adding water and mixing. You can use a wheelbarrow and mix with a hoe to a consistency that is able to move and fill voids, but is not too wet and soupy. Hoes work better for mixing concrete than shovels. Renting a mixer can reduce your labor time by half. Be sure to follow the instructions listed on the packaging. It is possible to make your own concrete mix by combining 3 parts gravel, 2 parts sand and 1 part cement, but this requires more knowledge and skill than using premixed bags. Your footing should be at least as thick as it is wide at its base. The ideal temperature for pouring concrete is between 50-90 degrees F.
Make sure you use 5,000 psi concrete mix. Once you have poured half of the concrete into the tube, you should consolidate it with a shovel or a piece of rebar to eliminate air pocket voids. Pour concrete until it is overflowing the form tube and level off the top with a shovel.
Cutting a Concrete Pad
Learn how to use a concrete saw to cut a hole in a patio slab to install a deck footing.
Installing footings on a sloped yard
Our inspector explains how to install concrete deck footings on uneven ground.
Deck Footing Depth
Find out how deep you need to dig your footings in your area. Look at our U.S. map of extreme frost penetration.
How to Decorate Deck Support Columns
Browse some examples of decorative deck support posts for tall decks.
Determining Deck Beam Height
Learn how to measure in order to set your posts to properly position your deck beam to the correct height. We recommend sloping your deck to shed water away from the house.
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.
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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