Discover All About Deck Support Systems
- info203132
- Apr 2
- 4 min read
Building a deck is an exciting project! But before you start laying down boards and picking out furniture, you need to understand the backbone of your deck - the deck support system. I’m here to walk you through everything you need to know about these crucial components. Whether you’re planning a new deck or upgrading an old one, knowing how your deck is supported will save you headaches and keep your outdoor space safe and sturdy.
What Are Deck Support Systems?
Deck support systems are the structural elements that hold your deck up. Think of them as the skeleton of your deck. Without a solid support system, your deck could sag, wobble, or even collapse. These systems include posts, beams, joists, footings, and sometimes piers or concrete pads.
Here’s a quick breakdown:
Posts: Vertical supports that transfer the deck’s weight to the ground.
Beams: Horizontal supports that rest on the posts and carry the joists.
Joists: Smaller horizontal boards that support the decking boards.
Footings: Concrete bases that keep posts stable and prevent sinking.
Each part plays a vital role in making sure your deck stands strong through all kinds of weather and use.
Types of Deck Support Systems
There are several types of deck support systems, and the right one depends on your deck’s size, height, and location. Here are the most common types:
1. Post and Beam System
This is the classic setup that Built to Last Construction LLC uses. Footings of deck are constructed of 4”x 6” post that are sealed and backfilled with pea gravel (this helps in the preservation of footing posts) and sitting on 4” concrete foundation 12” in diameter with a minimum of 42” below grade. Carriage beams are constructed of 2- 2”x 8” treated boards fastened together with 3” galvanized ring shank nails that are notched into and seated on 4”x 6” post. They are then anchored with 1/2”x 7” carriage bolts that are ran through carriage beam and 4x6” post. Posts are 5-foot on center. This system is great for decks that are elevated or need to support heavy loads.
2. Cantilevered Decks
Cantilevered decks extend beyond the support posts without additional posts underneath. They rely on strong beams and joists anchored to the main support beam. This design looks sleek but requires precise engineering.
3. Floating Decks
Floating decks sit directly on the ground or on concrete blocks without being attached to the house. They use a grid of beams and joists supported by concrete piers or blocks. These are perfect for smaller, low-to-the-ground decks.
How many posts to support a deck?
This is a question I get asked a lot! The number of posts you need depends on several factors:
Deck size: Larger decks need more posts.
Beam span: How far your beams can stretch without bending.
Load: How much weight your deck will carry (people, furniture, grills).
Local building codes: These often dictate minimum post spacing.
A general rule of thumb is to space posts about 5 to 8 feet apart. For example, a 12-foot beam might need two posts spaced 6 feet apart. But this can vary based on the wood type and beam size.
Here’s a simple way to estimate:
Measure your deck’s length and width.
Decide on beam spacing (usually 5-8 feet).
Calculate how many beams you need.
Multiply beams by the number of posts per beam.
Remember, it’s always best to check with local building codes or a professional contractor to make sure your deck is safe and up to code.
Materials Used in Deck Support Systems
Choosing the right materials for your deck support system is key to durability and safety. Here’s what I recommend:
Pressure-Treated Wood
This is the most common material for posts, beams, and joists. It’s treated to resist insects, and moisture. It’s affordable and widely available, making it a favorite for many deck builders.
Steel Posts and Beams
Steel is incredibly strong and durable. It’s often used for commercial decks or where extra strength is needed. Steel resists warping and insect damage but can be more expensive.
Concrete Footings and Piers
Concrete is essential for footings. It anchors posts firmly in the ground and prevents shifting. Piers can be poured concrete or precast blocks. They provide a stable base for your deck.
Why Proper Deck Support Matters
I can’t stress this enough - proper deck support is non-negotiable. Here’s why:
Safety: A poorly supported deck can collapse, causing injuries.
Longevity: Good support prevents sagging and damage over time.
Value: A well-built deck adds value to your property.
Compliance: Meeting building codes avoids fines and insurance issues.
If you’re building or repairing a deck, don’t cut corners on support. It’s the foundation of everything else.
Tips for Maintaining Your Deck Support System
Once your deck is built, maintenance keeps it strong. Here are some tips I follow and recommend:
Inspect posts and beams yearly for cracks, rot, or insect damage.
Check footings for signs of shifting or erosion.
Keep the area around posts clear of debris and vegetation.
Seal or paint wood posts to protect against moisture.
Tighten any loose bolts or brackets regularly.
A little upkeep goes a long way in extending your deck’s life.
Ready to Build a Deck That Lasts?
If you’re in Lower Michigan and want a deck that stands the test of time, understanding your deck support system is the first step. Whether you’re DIYing or hiring pros, knowing the basics helps you make smart decisions.
For those looking for all posts for deck support, there are plenty of options designed to fit your project’s needs. Choosing the right posts and support system means your deck will be safe, sturdy, and ready for years of enjoyment.
Building a deck is a big investment, but with the right support system, it’s one you’ll be proud of. Let’s get your outdoor space Built to Last!
If you want to dive deeper or need help with your deck project, feel free to reach out. I’m here to help you build something amazing!
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