Why Deck Framing Matters: What to Look for Before You Build
- Mark Giannone
- Apr 20
- 3 min read
When it comes to building a deck, the framing—the part you don’t see—is just as important as the surface you walk on. At C-JAM Construction, we don’t just meet code—we go above and beyond to build safer, longer-lasting decks that hold up under real-world use.
Whether you hire us or someone else, here’s what you need to know about deck framing so you don’t get stuck with shortcuts.
💪 Deck Framing Basics (According to Code)
The International Residential Code (IRC) lays out minimum standards for safe deck construction. Here are the key takeaways from the 2021 NJ Residential Code – Section R507:
Joists (R507.6): Support the deck surface. Must meet span requirements based on spacing and lumber size.
Beams (R507.5): Carry the load from joists to posts. Must be sized correctly and spliced properly.
Posts (R507.8): Vertical supports. Must be a minimum of 4x4 — but that’s the bare minimum.
Railing Posts (R507.10): Also require minimum 4x4 pressure-treated posts when attached properly.
🔨 How C-JAM Builds Stronger Decks
We’re not in the business of just passing inspections. Our decks are built to outperform code. Here’s what sets our framing apart:
Joists: We use 2x10 pressure-treated lumber — larger and stronger than standard 2x8s. This gives your deck more load capacity and helps prevent bounce or sagging.
Beams: All our decks use 2x12 beams for major support. Oversized beams mean your deck holds up better over time, especially under heavy use or added features (like grills, hot tubs, etc.).
Deck Posts: We install 6x6 structural posts—not the bare-minimum 4x4s. These posts resist twisting, carry more load, and look cleaner.
Railing Posts: Even for railings, we stick with 4x4s or 6x6s, installed with proper blocking and hardware to meet IRC lateral load requirements.
💡 Learn more about your decking options in our Trex vs. Wood: Which Deck is Right for You? blog post.
🧱 Why This Matters to You
Upgrading framing means:
✅ More safety (less flex, less movement)✅ Longer deck lifespan (less rot, less wear)✅ Better appearance (thicker framing = more solid construction)
Cheap decks look fine for a year or two — then start failing.Don’t settle for “just good enough.”
🕵️ What to Ask Any Contractor Before You Hire
Before signing off on a deck project, ask:
What size joists and beams are you using?
Are you using 4x4 or 6x6 posts for the frame?
How are railing posts secured to meet code?
Will this framing exceed NJ residential code?
If they stumble, give us a call.
👷♂️ Bottom Line
Most people never think about what holds their deck up—but it’s the most important part of the build.
At C-JAM Construction, we frame every deck like we’re building it for our own home:
✅ 2x10 joists
✅ 2x12 beams
✅ 6x6 structural posts
✅ Proper blocking and secure railing posts
This framing system supports the full value of your investment.
Learn more about how it boosts resale in our post on How a New Deck Adds Real Value to Your South Jersey Home.
📞 Call (856) 329-2933 or request a free estimate here.
Let’s build it right — no shortcuts, no BS.