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When considering decking for your outdoor space, the term "6-inch deck boards" might lead you to believe that's the exact size you'll be getting. However, it's essential to understand that dimensions are often nominal, and the actual size can vary. This article delves into the actual size of 6-inch deck boards and other related dimensions to help you make an informed decision.

In the world of decking, sizes are typically expressed in nominal dimensions, which refer to the original, rough-sawn size of the board before final milling. The actual size of the finished product is usually slightly smaller due to the removal of material during the manufacturing process.

Understanding Nominal vs. Actual Sizes

Before we dive into the specifics of 6-inch deck boards, it's crucial to grasp the difference between nominal and actual sizes. Nominal sizes are based on the original board dimensions, while actual sizes refer to the final, finished dimensions after milling and planing.

For instance, a typical 2x4 lumber starts with a nominal size of 2x4 inches but is often planed down to its actual size of about 1.5x3.5 inches. Understanding this difference can help you choose the right materials for your project and ensure a proper fit.

Nominal Sizes of Common Deck Boards

Most deck boards come in standard nominal sizes, which include 5/4x6, 2x6, and 2x8 inches. However, the actual sizes of these boards can vary slightly, as we'll explore next.

To provide a clearer picture, let's look at the nominal and actual sizes of these common deck boards:

Nominal Size	Actual Size (in inches)
5/4x6	1⅜ x 5⅞
2x6	1½ x 5⅜
2x8	1½ x 7⅜

Actual Size of 6-inch Deck Boards

The 6-inch dimension in "6-inch deck boards" refers to the nominal width of the board. When it comes to the actual size, the width is typically around 5⅜ inches, as shown in the table above. This variance is due to the material removed during the milling process.

While 6-inch deck boards might seem like an odd size, they are popular due to their strength-to-width ratio. They offer a wider surface area for walking on compared to narrower boards like 2x4s, yet they are still narrow enough to allow water to drain easily between the boards.

Other Key Deck Board Dimensions

Width isn't the only dimension to consider when selecting deck boards. Thickness also plays a crucial role in the longevity and durability of your deck.

Standard deck board thicknesses range from ¾ to 1⅜ inches. Some deck builders prefer thicker boards, as they can span greater distances between joists without sagging. However, thicker boards can also be more expensive and heavier to work with.

Thickness and Spacing Considerations

Choosing the right thickness for your deck boards depends on factors such as the span between joists, the desired look and feel, and your budget. Here's a general guideline for spacing and thickness:

• Joist spacing of 12 inches: ¾-inch or 1⅛-inch thick boards
• Joist spacing of 16 inches: 1⅛-inch or 1⅜-inch thick boards

For a more refined look, some homeowners opt for thicker boards, such as 1½ or 1⅜ inches, even when using 12-inch joist spacing. Keep in mind that wider gaps between boards may be required with thicker boards to maintain proper drainage.

Depth and Length

Depth and length are also essential considerations when selecting deck boards. The depth determines the overall width of your deck when laid side-by-side, while length affects how many boards you'll need and the layout of your deck.

Deck boards are typically sold in lengths ranging from 8 to 20 feet. While longer boards can save you time and reduce the number of cuts needed, they might be more challenging to work with and could increase the risk of waste due toDamage from handling.

When planning your deck, consider these factors to determine the best size and type of deck boards for your project. By understanding the actual sizes of common deck boards, you can make an informed decision and end up with a durable, beautiful outdoor space. Happy building!