How Far Apart Should Deck Posts Be? A Complete Guide

Building a deck can be an exciting and rewarding project for any DIY enthusiast or professional contractor. One of the essential aspects of constructing a safe, sturdy, and long-lasting deck is knowing how far apart your deck posts should be. Proper spacing ensures that your deck can support the intended weight load and withstand various weather conditions without warping, sagging, or collapsing.

In this blog post, we’ll take an in-depth look at determining the optimal distance between deck posts to help you create a beautiful and functional outdoor space you can enjoy for years to come. So grab your measuring tape and let’s dive into the world of deck post spacing!

The Basics: Types of Deck Posts & Load Bearing Considerations

Before we get into specific measurements and guidelines for post spacing, it’s essential to understand the different types of deck posts and how they contribute to your overall structure.

There are two primary types of support posts used in decking construction:

  1. End or Corner Posts: These are typically 4×4 or 6×6 wooden posts that provide vertical support at the corners or ends of your decking structure.
  2. Intermediate Posts: Also known as “line” or “infill” posts, these are usually 2×2 or 4×4 wooden supports placed along the edges (or lines) between end/corner posts for added stability.

The size and material used for both end/corner and intermediate posts play a crucial role in determining how far apart these supports should be placed. But first, let’s discuss some critical factors related to load-bearing capacities.

Live Loads vs Dead Loads

Load bearing refers to how much weight (measured in pounds per square foot) your decking structure is designed to support safely. There are two main types of loads:

  • Live Load: Represents temporary forces acting on your decking structure due to the weight of people, furniture, and other objects.
  • Dead Load: Represents the permanent forces acting on your decking structure due to the weight of the deck itself (i.e., its boards, railings, posts).

The combined live and dead loads will ultimately dictate how far apart your deck posts should be spaced.

Deck Post Spacing Guidelines

There isn’t a one-size-fits-all answer for how far apart deck posts should be. The optimal spacing will depend on various factors such as post size, the material used, beam spans (distance between beams), and joist spans (distance between joists). To help you determine appropriate post spacing for your specific project, consider these general guidelines:

Post Size & Material: As mentioned earlier, end/corner posts are typically 4×4 or 6×6 wooden supports. In general, larger-dimension lumber (6×6) allows for more extensive spacing between posts compared to smaller-dimension lumber (4×4). Keep in mind that using pressure-treated wood is recommended for outdoor applications due to its resistance to rot and insects.

Beam Span & Joist Span: Beam span refers to the distance between support beams running parallel to the house or ledger board. Joist span is measured from the center of one support beam to another along with individual floor joists attached perpendicularly across beams. Longer beam/joist spans generally require closer post spacing.

Deck Height & Soil Conditions: Taller decks and unstable soil conditions may necessitate shorter post spacings to provide additional stability.

With these factors in mind, let’s explore some general recommendations for deck post spacing based on common residential code requirements:

Residential Code Recommendations

For most residential applications with typical live loads of 40-60 pounds per square foot (psf) and dead loads around 10-15 psf:

  • 4×4 Posts: Spacing between end/corner posts should generally not exceed 6-8 feet, with intermediate posts spaced no more than 4-6 feet apart along the deck’s perimeter.
  • 6×6 Posts: Spacing between end/corner posts can typically range from 8-12 feet, with intermediate posts spaced no more than 6-8 feet apart along the deck’s perimeter.

Keep in mind that these are general guidelines and may vary based on specific project requirements, local building codes, or other factors. Always consult a professional engineer or contractor and refer to your local building code for specific guidance on post spacing for your particular deck project.

Baluster Post Spacing

In addition, to support posts, many decks also include baluster (railing) posts. Baluster spacing is primarily determined by safety considerations rather than load-bearing capacity. According to most residential building codes:

  • Maximum Baluster Spacing: The space between adjacent balusters should be no greater than 4 inches (measured from the center of one baluster to another) to prevent small children from slipping through.

It’s essential to follow local building code requirements for baluster spacing and height as well as support post spacing when constructing your decking structure.

Final Thoughts & Tips

Determining how far apart your deck posts should be is a critical step in ensuring a safe and stable outdoor living space. Keep these key takeaways in mind when planning your next decking project:

  1. Consider all relevant factors such as post size/material, beam/joist spans, live/dead loads, deck height, and soil conditions.
  2. Consult local building codes and professionals for specific guidance tailored to your unique situation.
  3. Don’t forget about proper railing/baluster spacing!

How Far Apart Should Deck Post Be Conclusion

 In conclusion, when it comes to determining the spacing between deck posts, there are a few important things to keep in mind. First, you’ll need to consider the size of the deck and the weight that will be placed on it. You should also take into account how much space you want between your posts as well as any building codes or regulations in your area. Ultimately, with a little bit of research and planning, you can determine the best spacing for your deck’s posts and enjoy a sturdy and safe outdoor living space for years to come.

By taking the time to understand and implement correct post-spacing guidelines during construction, you’ll create an inviting outdoor space that stands up against the test of time (and weight).