Deck Footings 101: Learn Everything About Deck Footings (2024)

When it comes to building decks, the most important aspect needs to be their safety.

Deck footings are what keep your deck safe and secure, and the stronger they are, the more confident and stress-free you’ll feel on your deck.

In this guide, we’ll dive deeper into deck footings, what types of footings are there, and what to consider when choosing them.

Let’s begin.

Deck Footings 101: Learn Everything About Deck Footings (1)

What Are Deck Footings?

Before we move on, it’s important to discuss the difference between live load and dead load.

  • Live load is the weight of people, furniture, and any other thing on your deck.
  • Dead load is the weight of the deck itself, with all the materials, hardware, railing, stairs etc.

Deck footings are an essential element of any deck building project, as these ensure your deck will sustain both dead and live load.

Especially for elevated decks, you want to ensure sturdy and resistant footings, as you don’t want to risk seeing your deck collapsing under your feet.

What Are Deck Footings?

Back in the old days, the frame posts used to be placed directly in the ground. This meant the lumber was prone to damage from insects, humidity, and water, leading to rot.

Today, there are different kinds of footings, each with a better functionality than the other.

In most cases, deck footings are concrete footings in the form of a pad, of either 2-feet square or 2-feet in diameter, poured directly into the ground.

While the normal thickness of concrete deck footings is somewhere around 8 inches, professional deck builders will determine if your deck will need more.

Note: The footing holes of solid concrete footing need to be installed below the frost line. When water freezes, it expands and can cause your deck to move from its initial place. This moving can result in a structural hazard very quickly.

Depending on the soil on your property, there are 4 types of footings that professional deck builders use.

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The 4 Types Of Deck Footings

Below you’ll find the most common types of footings that deck builders use to secure any deck.

  • Buried post and footing
  • Tube Pier
  • Bell Pier
  • Pier and footing

Each of these will have different advantages and different prices too. Let’s discuss each of them.

1. Buried Post And Footing

Although this type of footing is more affordable than the others, it’s one of the least reliable footing options.

It requires an excavation of between 8 to 10 inches and poured concrete at the base. You’ll install the wood post and place it on the concrete pad, but then you’ll bury it in the ground.

As we mentioned earlier, burying your post in the ground means the wood will be susceptible to insects and water, leading to the most serious cause of concern – rot.

Rot will weaken the post and will cause serious damage to your deck. Which is why this type of footing is so inexpensive. You’ll pay between $25 to $36 per footing, for materials.

2. The Tube Pier

A tube pier footing is one of the easiest footings to install. It consists of a tube buried in the ground and filled with concrete.

As with any footing, it needs to be placed below the frost line. We even recommend digging an extra 4 inches deep to be safe.

Note: The tube footing diameter has to be exactly the same all around the footing. Tube footing relies on the friction and pressure of the soil that needs to be equal from all sides.

For a 12″ diameter concrete footing, you’ll spend between $200 to $400, depending on the concrete and tube material.

3. Bell Pier

A bell pier has the shape of a bell. The deeper the pier goes in the ground, the larger the diameter will be.

A larger concrete base will allow a better distribution of the live and dead load into the footing, and from there in the ground. It has a much better stability than the other footings mentioned above, but it requires more concrete material, therefore it’s more expensive.

4. Pier & Footing

The pier and footing is a very common footing used by both professionals and DIYers. Although it requires more work, this is a fairly easy and reliable footing.

The actual footing is poured in the ground first and leveled. Then, the first pier can be poured onto the footing.

For this, you’ll require some professional tools, like a template for the concrete post.

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Things To Consider Before Installing Your Deck Footings

Before you decide on the type of footings that you want, there’s some other things to consider when installing your deck footings.

Although your local professionals from Deck Bros will take care of these things for you, it doesn’t hurt to know in advance what needs to be taken care of.

Things To Consider Before Installing Your Deck Footings

The frost line is where the soil begins freezing. You’ll want to avoid constant expansions and contractions of the wood, as it will cause it to loosen up and damage its integrity.

In Omaha, Nebraska, the frost line is 48 inches.

Depending on the concrete mix you’re using, the concrete can also contract and expands, causing it to break. In deck construction, a concrete deck footing and concrete deck posts need to be reliable and not change its composition.

The Size And Layout Of Your Deck Footings

Size and layout are two extremely important aspects you’ll need to consider before deciding on what deck footings you’ll want.

  • The footings' size will determine how much weight your entire structure can sustain. If you have a larger deck than usual, you'll want your footings, posts, and frame to be reliable and strong enough to sustain the entire weight.
  • The Layout will determine the ideal places to install the footings. It's important to have the right layout because you'll want every part of your new deck to be ensured with at least a post.

Outdoor spaces, like decks and other permanent structures, require a lot of knowledge of the local building codes and regulations.

At Deck Bros, we take care of the building permit for you, and you won’t have to worry about your deck design, deck framing, or deck hardware. We’ll make sure your deck is up to the highest standards, and the local building department inspections are successful.

Ensure You're Not Damaging Underground Pipes Or Cables

The problem with pipes and cables underground is everlasting for every project where you have to dig.

You want to ensure you won’t hit anything important while digging. Broken pipes will cause major leaks that are difficult and expensive to repair.

Moreover, sometimes you might provoke a leak and you’ll only realize it after weeks, when your water bill will be outrageously hefty.

And there’s the same issue with cables. Not having power for weeks and waiting for your provider to come fix everything is a nightmare no one should have to go through.

Conclusion

So, what deck footings are right for you?

Based on the different footing types we mentioned above, the Bell Pier and Pier and Footing options are probably your best bet if you want something safe and reliable. But to pour concrete footings, there are many other factors that professionals take into consideration.

It’s up to you to decide how much you want to invest in your deck’s safety, but if you need professional advice, we’re here for you.

You canrequest a quoteand we’ll get in touch within a day, or you can call us directly at(402) 369-5724to discuss your upcoming project.

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Deck Footings 101: Learn Everything About Deck Footings (2024)

FAQs

How deep do footings need to be for a deck? ›

Each deck support post must be supported by concrete footings. The size of each footing is determined by the tributary load imposed on it. See the diagram below for an explanation of tributary load. Footing must be dug down into undisturbed soil and to a minimum depth of 12-in below the finished grade.

How many footings do I need for a 12x12 deck? ›

A basic attached deck foundation of 12 feet by 12 feet requires three 12-inch diameter deck footings. It will need at least two more if you build attached stairs. You can use a footing and beam calculator to help you determine how many footings will be best for your deck design.

What is the easiest footing for a deck? ›

Deck Block Footing

If you're looking for an easy DIY route, deck block footings may be a good choice for your project. Best for decks that are ground-level and not attached to a home, deck block footings help lift a deck away from the ground without requiring wood posts or digging.

Do I need to put rebar in deck footings? ›

Plain concrete deck foundations without rebar are acceptable under the minimum standards of construction established in the International Residential Code. However, placing reinforcing steel within footings is a relatively easy and inexpensive practice that can provide increased performance.

Do I need gravel under deck footings? ›

Putting gravel under your deck is a great way to add stability and drainage. It's simple to do and provides many benefits, from preventing soil erosion to helping protect the underside of your decking material from moisture damage, especially for ground-level decks.

Can I use deck pier blocks instead of footings? ›

Deck pier blocks are used in deck building as an alternative foundation to traditional footings. They are placed directly on the ground, and do not require digging or pouring. They come pre-formed with holes for attaching the posts of a deck, making it easy to install.

How far apart should support posts be for a deck? ›

The two most common sizes used for deck posts are 4×4 and 6×6. When using 4×4 posts, place them no more than 6 feet apart, and when using 6×6 posts, no more than 8 feet apart. The reason for these standards is that the railing system won't have proper support if the posts are too far apart.

How high above ground should deck footings be? ›

I prefer to have the top of my concrete deck piers at least 4 inches above the final grade around the piers. I don't want my treated lumber posts buried in the soil, as I've seen them rot and be a food source for termites.

How to determine where to put deck footings? ›

When measuring for where to place your footers, make sure that the holes will be square with your house and that they are are no more than 8-feet apart in either direction. This is a general recommendation to keep your deck as sturdy as possible.

Can you use QUIKRETE for deck footings? ›

Usually made of concrete, these footings can be considered the most important part to building your deck correctly. J&W Lumber recommends using QUIKRETE to build your concrete footings.

Should deck posts go in or on concrete? ›

There are several ways to set deck posts; we recommend attaching the posts to concrete footers above the ground. This helps to prevent wooden posts from rotting. Set footers a minimum of 6 inches below the frost line for your area to prevent movement during freezing temperatures.

Should you bury a deck post? ›

Per the IRC, the minimum depth of a footing is 12 inches below undisturbed soil. This is only for lateral stability, as regions with frost will require greater depths.

Do you put gravel under footings? ›

In soils with bearing capacity greater than about 4,000 psf, I suggest excavating next to the footing and under it, and placing compacted large gravel into the space. That should be adequate to support the wall. If there's a keyway in the wall, fill it in, and if there's steel projecting from the footing, cut it off.

How far should rebar be from bottom of footing? ›

4 bar located 3 to 4 inches (76 to 102 mm) from the bottom of the footing must be provided. Masonry stem walls must be solid grouted. The footing and stem wall reinforcement material, location, support, cover and lap splices must comply with Section R403. 1.3.

What is the best concrete mix for footings? ›

A concrete mix of 1 part cement : 2 parts sand : 4 parts coarse aggregate (by volume) should be used for footings.

How deep to bury a 4x4 deck post? ›

Dig post hole so diameter of the hole is 3 times the width of the post (i.e., the hole for a 4” wood post should be about 12 inches wide). The depth of the hole should be 1/3-1/2 the post height above ground (i.e., a 6-foot tall fence would require a hole depth of at least 2 feet).

How deep do decking support posts need to be? ›

They are offset by the width of a post to allow deck posts (which will be needed when attaching railings or balustrades) to be slotted in later. A lot of the work at this stage requires two pairs of hands. In the corners of the marked area, dig out 700mm deep holes for each of the joist support posts.

Can you build a deck without footings? ›

A deck that's constructed without concrete footers — the columns of concrete poured into holes that support the deck — is called a floating deck. A floating deck sits directly on the ground or on deck blocks or deck piers to support the deck.

How deep does the bottom of a footing need to be? ›

A minimum of 12”inches deep for all footings and the width will be determined by the amount of stories, 12” inches for a single story, 15” inches for a two story and 23” inches for a three story. This is based on a soil bearing capacity of 1500(psf).

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