Repairing a Concrete Deck Footing

How to Restore your Deck to a Level Footing

By Mark J. Donovan




When a deck is built with improperly installed deck footings, the deck can heave or sink. When this situation arises repairing concrete deck footings is necessary. In colder climates, if the concrete deck footings are installed above the frost line, the deck footings or deck concrete pads often heave up during the cold weather and then sink down when the warm weather returns. Repeated cycles of this type of action often lead to a deck surface that is no longer level.

To repair a concrete deck footing you first need to brace or jack up the deck near the area of the particular deck footing.

If the deck post is mechanically fastened to the deck footing with anchor bolts remove them so that the deck pole can easily rise up when you jack up the deck area.

Next, use a shovel to dig out around the deck footing. Be prepared for some hard work. Wear work gloves and proper shoe wear and plan some serious digging.



Once you have fully exposed the deck footing or concrete deck pad, break it up with a sledge hammer and remove all the pieces. Make sure to wear eye protection when breaking up the old deck footing or concrete pad.

After removing the old concrete deck footing, continue to dig down deeper in the footing hole until you are at least 6 inches below the frost line area for your local area. Make sure the base of the hole is wider than the top of it when digging out the hole.

 Repairing a Concrete Deck Footing

It is important to understand that deck footings support a serious amount of weight. A small deck, for example, with deck furniture and people on it can easily way in at over 10,000lbs. Consequently it is important to install new deck footings that are 12-24 inches in diameter to provide an effectively wide enough area for supporting a significant portion of the weight of the deck. In addition, it is important to have the deck footing wider at the base of the hole. By creating an upside down funnel shaped hole, if you will, it becomes more difficult for frost to push a concrete deck footing pad upwards.

After digging out your deck footing hole, visit your local home improvement store to find Sono-tubes with wide plastic footing form bases. Place the Sono-tube with the attached footing form base into your deck footing hole and use a level to plumb it. Also use a plumb bob to position the Sono-tube directly under the existing deck post.

After ensuring that the Sono-tube is plumb backfill dirt around it. Then pour concrete into the Sono-tube to create the new deck footing. As you pour the concrete into the Sono-tube, place a few vertical reinforcing steel bars (re-bar) into the Sono-tube to increase the strength of the deck footing. After pouring the cement, install mechanical deck footing anchor hardware into the top surface of the concrete.

Deck Installation Bid Sheet

Allow the new deck footing to setup for 24 to 48 hours, depending upon weather conditions, and then re-attach the deck post to the repaired deck footing. You may need to trim the deck post, depending upon the new height of the repaired deck footing.

Finally remove the bracing and your deck should once again be level.


For help on building a deck, see HomeAdditionPlus.com’s Deck Installation Bid Sheet. The Deck Installation Bid Sheet will teach your how to hire the right deck contractor, and help to ensure that your deck project is completed on time and budget.

Related Information


Additional Deck Building and Design Resources


Get Free Deck Building Price Quotes with No Obligation!

Fill out our 3-5 minute quick and easy form, and receive a free price quote on decks from one of our pre-screened and licensed deck contractors. This process is free and there is no obligation to continue once you receive your decks price estimate.