Deck ledger board flashing and structural framing connection diagram

Choosing a decking material is a big decision. It’s not just about looks. You also need to think about your climate, how hard the install will be, how much upkeep you’re willing to do, and how much you want to spend.

This guide compares four common decking materials: pressure-treated lumber, western red cedar, composite, and PVC. We’ll walk through how each one installs, how it performs against weather and heat, and what it actually costs. All of the numbers below come from one real side-by-side comparison. Use them as a helpful example, not a universal price list for your area.

The Four Materials at a Glance

Pressure-treated lumber is a softwood. On its own, it would rot easily and attract insects. To fix that, the wood gets chemically treated. This treatment protects it from rot and bugs. It’s also the cheapest option on this list.

Western red cedar resists rot and insects naturally, without any chemical treatment. Because of that natural resistance, it costs more than pressure-treated wood. You can paint it, stain it, or just let it weather to a natural gray color. Both cedar and pressure-treated wood last about the same amount of time: roughly 15 to 20 years before they start looking worn out.

Composite decking is usually made from a mix of recycled plastic and recycled wood. Manufacturers add a protective cap on top of the board. This cap blocks UV rays from the sun. Without it, the board would warp, bend, or develop soft spots over time. Composite also resists moisture very well. One product used in this comparison came with a 50-year warranty.

PVC decking is made from 100% virgin plastic. It contains no recycled material at all. Of the four materials here, PVC is the most expensive.

Starting Your Install: Picking the First Board

Before you install anything, sort through your boards. Even boards that are supposed to be straight often have some curve to them. Set that curved board aside for now. Start your row with the straightest board you can find. That first board sets the line for every board after it.

If your deck frame is pressure-treated and your decking is pressure-treated too, you have a few options for how the edge looks:

Fastening Basics for Wood Decking

Now that your first board is in place, it’s time to fasten it down. A few simple rules apply to wood decking in general.

Keep your screws at least 1 inch from the edge of the board. This gives the wood enough material around the screw to hold strong.

Near the end of a board, start your screw in reverse first. Reverse it until you feel the screw catch. Then switch direction and drive it forward, just below flush with the surface. This two-step method helps prevent the board from splitting.

Screw length matters too. As a rule of thumb, your screw should be about 1.5 times as long as the board is thick. For example, a 1-inch-thick board needs a 2½-inch screw.

Always use coated screws for pressure-treated wood and cedar. Look for screws marked ACQ on the box. This coating stops the screw from rusting, and it prevents a chemical reaction between the screw and the wood. Regular, uncoated screws will react badly with treated wood over time. If your deck is near salt water, skip the coated screws and use stainless steel instead. Coated screws don’t hold up as well in that environment.

Getting screw length and spacing right takes some math, and it’s easy to get wrong by hand. The Sketchronix Engine can generate a complete fastener schedule for you, based on your exact board thickness and framing. That way, you’re not guessing at screw sizes on site.

Working With Wet or Warped Wood

Sometimes the lumber you buy is still wet. If that’s the case, you can install the boards tight together with no gaps between them. As the wood dries out, it will shrink slightly, mostly across its width rather than its length. This shrinking naturally opens up small gaps between the boards. In normal weather, this drying process takes about 3 days.

If you’d rather control the spacing yourself from the start, do this instead: bring your lumber to the job site early, stack it up, and let it sit for a few days before you install it. This lets the wood dry out ahead of time, so the gaps you create during install stay consistent.

Cedar boards can vary quite a bit depending on where they came from. Different suppliers and different mills produce different grades of cedar, and some boards arrive noticeably warped. For a warped board, a clamp-style spacer tool can help. This tool holds the board firmly in place while you work. Set the warped board on the deck frame, clamp it with the spacer tool, and let it dry there for a few days in good weather before you drive any screws.

A Better Way to Fasten Warped Boards: The Camo System

Deck ledger board flashing and structural framing connection diagram

If you’re dealing with warped or curved boards, a standard deck screw isn’t always your best option. A Camo-style fastening system is built specifically for this problem.

Here’s what makes it different from a regular screw. It has a clipped end, which helps prevent the wood from splitting. It also has a reverse thread near the top of the screw. This reverse thread pulls the board in tight as you drive the screw. And its head is much smaller than a standard deck screw’s head.

The biggest difference is where the screw goes. A Camo screw drives in through the side of the board, not through the top. This matters because of how the board resists warping. When a screw goes through the side, the wood’s cupping forces have to fight against the entire length of the screw buried inside the board. With a top-mounted screw, those same forces only have to fight against the screw head. That gives the Camo system much stronger holding power against warping.

Two companion tools make this system easier to use. The first tool, sometimes called a Camo Claw, holds a badly warped board steady while you fasten one end. The second tool is a lever with an offset wheel. Once the first end is fastened, you use this lever to pull the rest of the board into place. It creates a consistent, even gap as you work your way down the board. You’ll want to use one of these tools on every single board for the best results. The upside is that one person can do this alone.

Installing Composite Decking

Deck ledger board flashing and structural framing connection diagram

Composite boards work differently from solid wood, starting with what they’re made of. Many composite products use up to 95% recycled material. On top of that recycled core, manufacturers add a capped finish layer. This cap does two jobs: it creates a waterproof wear surface, and it blocks UV rays on three sides of the board to protect the color over time.

The install process is also different. Solid wood boards are the same all the way through, so you can screw through the top or side wherever you like. Composite boards, on the other hand, usually have a groove running along each side. That groove is designed for hidden fastener clips, so you never have to drive a screw through the visible face of the board.

Here’s the typical install process, step by step:

  1. Snap a chalk line across the joists. This gives you a straight reference line to work from.
  2. Set your starter clips along that chalk line.
  3. Each clip locks onto the joist and has a small metal tongue. That tongue slides into the groove on the side of the board.
  4. Slide the next board into place against the one before it, and repeat.

Working four boards at a time tends to speed things up. Overall, this hidden-fastener method installs faster than either the Camo wood system or traditional surface screws.

Composite boards aren’t automatically perfectly straight, so it still helps to use a board straightener tool to keep your gaps even. When you drive the clip screws, use a T15 bit, and use a chuck drill instead of an impact driver. An impact driver can easily overpower the small clip. If that happens, the screw head can crack straight through the plastic clip and ruin it.

One more advantage worth knowing: composite doesn’t expand and contract with temperature changes the way PVC does. That makes it a solid choice if you live somewhere with hot summers and cold winters.

Installing PVC Decking

PVC decking has a reputation problem from its early years. Two complaints came up often: that it felt too slippery, and that it got too hot to walk on in direct sun. (We’ll look at both of those claims with real tests in the next section.)

If heat is a concern where you live, choose a lighter-colored board. Dark colors absorb more UV from the sun, so a darker deck will always run hotter than a lighter one, regardless of material.

One important detail for PVC and composite decking: nearly every manufacturer uses its own proprietary clip system, and that system is often tied directly to the product’s warranty. In other words, if you install a different brand’s clips, you could lose your warranty coverage. As a homeowner, always buy the clips and hardware made specifically for the decking product you chose.

Why Weather Testing Matters

Now that we’ve covered installation, let’s look at how each material actually performs once it’s outside. Rain, ice, and sun all put decking materials to the test in different ways. The next few sections cover slip resistance, weight-bearing strength, and heat resistance.

Wet-Surface Slip Testing

Many people assume that composite and PVC decking get slippery when wet. This comparison tested that assumption directly, and the results were the opposite of what you might expect.

Both composite and PVC stayed non-slip even when soaking wet. In fact, PVC felt slightly grippier than composite in this test. Wood, on the other hand, felt noticeably more slippery when wet. This likely comes down to surface texture. Raw wood gets planed very smooth at the mill, which leaves it with almost no texture to grip your feet.

This matters if you’re planning to leave your wood decking untreated and let it weather naturally to gray. Without some added texture or treatment, a bare wood deck could become a real slip hazard in wet weather.

Weight and Deflection Testing

Next, each material was tested for how much it bends, or “deflects,” under weight. This test used a 6-foot span between supports. A wider span makes any differences between materials easier to see.

Here’s how each material performed under the same load:

To put those PVC numbers in perspective: that’s roughly 2.5 times more deflection than the composite board, 5 times more than the cedar board, and 10 times more than the pressure-treated board.

Even though composite deflected more than the wood, that amount is still considered normal. Most composite manufacturers recommend spacing your joists 16 inches apart, measured center to center. If you want a deck that feels a little sturdier underfoot, you can space your joists closer together, at 12 inches on center instead.

Joist spacing is one of the most important structural decisions in any deck build, and it changes depending on which decking material you choose. The Sketchronix Engine can generate a permit-ready framing plan with the correct joist spacing already calculated for your material and span. That takes the guesswork out of this step.

Heat and Fire Testing

The last test used a torch to see how each material handled direct heat, while measuring how much each board sagged under the same weight from the deflection test.

Pressure-treated wood barely changed at all. Even under sustained heat, it held its shape well, which confirms that a standard 16-inch on-center spacing works fine for pressure-treated decking in hot conditions.

Composite caught a small flame, but the flame didn’t spread. Its deflection increased only slightly, from about 1 inch up to about 2 inches, even while the torch was applied directly to the board.

PVC reacted the most dramatically of the three, despite carrying an official Class One fire rating. Under the torch, its deflection climbed quickly, first to about 7½ inches, then toward 9 inches, until the board could barely support the test weight on its own.

Based on this test, composite handled direct heat the best of the three materials tested. Both the wood and PVC samples ended up visibly scorched. Keep in mind this was one informal test, not a certified fire safety study.

If you live somewhere with intense, all-day sun, like a desert climate, consider tightening your joist spacing further, down to 12 inches or even 10 inches on center. And remember: darker decking colors absorb more heat, so a darker board will always feel hotter underfoot than a lighter one, no matter which material you choose.

Cost Comparison for a 200 sq ft Deck

Now let’s talk about cost. The numbers below come from one specific project and are meant as a helpful example, not a fixed price you should expect everywhere. Prices vary by region and supplier.

Pressure-treated:

This total does not include the cost of building the frame underneath the deck.

Cedar:

That’s about double the upfront cost of pressure-treated decking.

Composite:

PVC:

Keep in mind these totals are based on a 200 sq ft deck. A bigger deck, like 400 sq ft, would cost roughly double. None of these numbers include fascia, skirting, stairs, or railings.

Cost Over the Long Run (Roughly 50 Years)

Upfront cost only tells part of the story. Here’s how the numbers change when you look at a 200 sq ft deck over a 50-year span.

Cedar costs roughly $3,500 over 50 years. That’s true whether you let it weather naturally to gray or keep it maintained the whole time.

Composite costs land in a wide range, depending on quality. A lower-cost product might total around $2,500, but it may only last about 25 years, meaning you’d likely need to replace it once during that 50-year window. A higher-end, well-maintained product costs more upfront but can last closer to the full 50 years, landing somewhere around $5,000 to $5,400 total.

PVC costs about $4,600 for an economy product or $5,000 for a luxury product. Either option is expected to last close to the full 50 years.

Zooming out, the total lifetime cost across all four materials ends up in a fairly similar range. The real deciding factors usually come down to your climate, how much maintenance you’re willing to do, and how much the material’s appearance matters to you or to a future buyer.

Choosing What’s Right for Your Project

There’s no single “best” material here. The right choice depends on your priorities:

Whichever material you choose, remember that the frame underneath your deck matters just as much as the surface on top. A strong, correctly spaced frame is what makes any of these materials perform the way it’s supposed to.

Disclaimer

This article is for informational and educational purposes only. The techniques, measurements, product specifications, deflection figures, and pricing referenced above come from a single comparison and should be independently verified before you rely on them for your own project. Always confirm current product specifications, fastener requirements, and pricing with the manufacturer, and consult a licensed professional along with your local building codes for any structural, electrical, or safety-related decisions. Sketchronix Insights makes no guarantees as to the accuracy of this information and is not liable for any damages, injury, or losses resulting from its use.