Often asked: How To Pour Concrete Deck Footings?

How deep should a concrete footing be for a deck?

Footings typically must extend below the frost line to prevent shifting during freeze-thaw cycles. Dig footing holes about 6 inches deeper than required. Fill the bottom of the hole with 6 inches of gravel and compact the gravel with a 2×4 or wood post.

What kind of quikrete do you use for deck footings?

QUIKRETE 5000 is recommended for footing applications because of its heavy duty, 5000 PSI strength. Add the QUIKRETE 5000 concrete mix to the form. After half of the form is filled, consolidate the concrete with a piece of rebar or a shovel.

How deep do concrete piers need to be?

By code, the bottom of a footing must be at least 12 inches deep and below the local frostline—whichever is deeper—and bear on stable, undisturbed soil that is free of organic matter. And the code requires a minimum compressive strength of 2,500 psi for the concrete.

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Do you need rebar for deck footings?

Most deck builders don’t place steel reinforcing rebar in footings, but in areas with expansive or other unstable soils rebar is usually required.

Why deck posts should not be set in concrete?

A deck post should always be placed on top of footing, not inside concrete because it can break. Concrete tends to absorb moisture and wood expands when it gets wet, so these two factors combined will result in the wood breaking the concrete.

How many footings do I need for a 12×16 deck?

A standard deck will need four footings parallel to the house, but they will need to be temporarily braced by 6 inch-by-6 inch posts. Using doubled boards, you will then need to build beams on the top row of the posts to frame the edges of the deck. These must be topped with adjustable post caps.

How do you build a deck without digging holes?

OZCO Building Products’ OZ-Deck Foundation System is one of the best ways to build a deck without digging holes. It’s a hot-dipped galvanized plate that when combined with OZCO’s post anchors creates a solid foundation so you can build a solid deck without digging holes or pouring concrete.

How do you build a deck without footings?

Instead of using footings, adding a level of gravel will give you the drainage aspect you are looking for. You can then add a frame of wood that anchors in concrete blocks that sit in the gravel, creating your new deck. Concrete blocks won’t rot, making them an ideal option for those who don’t want to use wood.

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How long do footings need to cure?

If you use a concrete that has a quick setting additive you need to wait a minimum of one sunny day, if you are using a standard concrete footing mix I would recommend waiting for a minimum of seven days and a maximum of 28 days, of course, that is if the conditions are right for the concrete to cure and set hard.

Is Clay a good base for concrete?

The clay can compress under the weight of the concrete, causing the slab to shift or sink over time. It also can leach moisture from the concrete itself, resulting in uneven curing and a brittle base. With proper preparation, however, it’s possible to pour a slab on clay soil without encountering these problems.

How thick should concrete footings be?

Eight inches is the minimum thickness for a footing. Ten inches is better and twelve inches is highly desirable. The depth of the footing in the ground depends on: the local frost depth.

How deep do my footings need to be?

Footings need to be minimum 1m deep by 600mm wide. We always trench fill with concrete. Final decision will be with building control, hope you dont have any large trees near.

How long should deck footings dry?

The Portland Cement Association advises that conventional concrete cures for five to seven days for best results. Some manufacturers make rapid-curing concrete for deck footings that cure in 24 hours.

How do you put rebar in concrete footings?

Placement of Rebars



It is a general rule that reinforcements should be placed at the tension side at the bottom of the footing. In a square footing, rebars are placed uniformly in both directions. ACI code requires that the rebars be placed not more than 18 inch apart.

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Do you put rebar in sonotube?

To support a beam for a residential deck, does a Sonotube pier need any rebar? A. We usually recommend that a minimum of two pieces of #4 rebar be placed vertically in an 8-inch-diameter concrete pier supporting a structure. A larger-diameter pier should have four or more pieces of vertical rebar.

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