You’re here because you need a bit more information before purchasing deck screws, and we’re going to keep it simple. Here’s what most buyers ask us:
What length screw should I use? Choose screws that are 2 ½" to 3" long so they penetrate at least 1" into the joist beneath the deck board.
Which material is right for my project? Use 18-8 stainless steel for most outdoor applications, or upgrade to 316 stainless steel for coastal or high-moisture environments.
If you’re ready to order now, shop our stainless steel deck screws, available in multiple lengths and gauges, and always hand-packed with care from our Pennsylvania warehouse.
If you want to learn more, we've got a detailed breakdown on deck screw sizing, the difference between 18-8 and 316 stainless steel, and how to choose the right option for your project.
For wood decking, the industry best practice is to use a screw long enough to penetrate at least 1 inch into the joist, which usually means a 2 ½” to 3” wood screw, depending on the thickness of your deck boards.
Use #8 gauge screws for most standard deck boards, and step up to #10 when fastening thicker or denser material like 2×6 or hardwood.
Here's a simple breakdown of wood screw sizes to use based on common deck board sizes.
|
Deck Board Thickness |
Recommended Screw Length |
Screw Gauge |
Screw Type |
|
5/4” (1.25”) deck boards |
2 ½” |
#8 |
18-8 or 316 stainless |
|
1 ½” deck boards |
3” |
#10 |
18-8 or 316 stainless |
|
2” nominal lumber |
3 ½” |
#10–#12 |
316 stainless preferred |
|
Composite decking |
2 ½” – 3” |
#10 |
316 stainless (specialized)* |
Note: Composite decking often requires specialized screws designed to prevent mushrooming or cracking. Always check manufacturer recommendations.
[Shop 18-8 & 316 Stainless Steel Deck Screws]
While the US-adopted International Residential Code (IRC) doesn’t specify exactly what length screw to use for deck boards, it does provide clear standards for deck structure, including joist sizing and span limits (IRC Table R507.6). That structural information matters because your fasteners need to hold up to the movement and weight those joists support.
That’s why a 2 ½" to 3" stainless steel screw is the industry sweet spot. It reliably sinks at least 1" into the joist while anchoring the deck board securely from above. These sizing recommendations assume joists are spaced 16" on center, which is standard for most residential decks.
These recommendations also assume common decking board sizes, like 5/4" boards (1" actual thickness) or 2×6 boards (1 ½" actual thickness). In both cases, a 2 ½" to 3" screw provides the right depth without overdriving, ensuring strong, lasting attachment to the frame.
We get a lot of questions about screw gauges, but the right choice depends on the thickness of your deck boards and how much holding strength you need.
For most wood decking projects, you’ll want to use either a #8 or #10 gauge screw.
#8 screws are ideal for standard 5/4" deck boards. They’re easier to drive, provide solid holding power, and work well in most residential settings.
#10 screws are better suited for 2×6 decking, dense hardwoods, or when you want added strength. They’re slightly thicker and grip more aggressively.
In general, thicker boards and high-traffic areas benefit from longer, heavier-gauge screws to reduce movement, cupping, and pullout over time.
We always recommend working with a professional and reviewing your local codes before undertaking any project. If you’re unsure, start with #8 for typical builds. Step up to #10 when you’re working with thicker material or want a stronger, longer-lasting connection.
Both 18-8 and 316 are stainless steel, but 316 offers a higher level of corrosion protection, so it’s the better choice if you’re building near the ocean, by a lake, or in a high-humidity region.
Still need help choosing the right screw finish?
If you’re building an inland deck, fence, or general backyard builds and want to keep costs down → Buy 18-8 stainless steel wood screws
If you’re building near the ocean, by a lake, or in a high-humidity region → Buy 316 stainless steel wood screws
Deck screws are also available in galvanized, ceramic-coated, and other corrosion-resistant finishes, and in the right conditions, these are solid performers.
Hot-Dipped Galvanized Screws: These offer solid corrosion protection but may show signs of wear or surface rust over time in wet environments.
Ceramic-Coated Screws: These deck screws resist corrosion and are usually rated for use with pressure-treated lumber. However, their exterior coating can be worn down or chipped away over time.
Stainless steel screws offer corrosion resistance all the way through, not just on the surface. There’s no coating to chip or degrade, so they’re the most durable long-term choice.
That’s why we currently stock 18-8 and 316 stainless steel deck screws. They perform reliably, hold up to the elements, and help protect your build for the long haul.
At The Fastener Depot, we’re a family-owned business committed to delivering reliable stainless steel fasteners, straightforward advice, and service that feels personal — because it is.
Still have questions about sizing, material, or application? Reach out to our team for friendly, fast support. Or, if you’re ready to get started:
Yes, especially for outdoor use. Stainless steel won’t rust, corrode, or stain your decking over time. It’s a more durable, low-maintenance option that holds up in all weather conditions.
Use #8 screws for standard 5/4" decking. Choose #10 for thicker boards like 2×6 or when you want added holding strength. Both work well outdoors when properly sized and made from corrosion-resistant material.
316 stainless steel contains molybdenum, which gives it greater corrosion resistance than 304 (also known as 18-8). Use 316 in coastal or high-moisture environments. For most inland decks, 304 is sufficient.
Yes, a #10 screw is slightly thicker than a #8. That extra diameter gives it more holding power, especially useful for thicker deck boards or heavy-use areas.
Stainless steel screws cost more and are slightly softer than coated or galvanized steel. That means they can strip if overdriven or used without the right bit. Still, for outdoor longevity, they’re hard to beat.
For 2×6 decking, the right choice is a 3" deck scre,w which is long enough to fully secure the board and anchor into the joist.
