When planning a deck, one of the most common and important questions is how thick are decking boards. Decking board thickness directly affects durability, strength, and long-term performance. Most standard decking boards are typically 1 inch to 1¼ inches thick (often referred to as 5/4 decking), which works well for residential decks with joist spacing of 16 inches on center. For heavier loads or wider joist spacing, thicker boards provide added stability.

For premium hardwood decking, thickness can range from 1½ inches to 2 inches. Thicker boards are less likely to warp, cup, or crack over time, making them ideal for high-traffic areas, commercial spaces, or decks exposed to harsh weather conditions. Choosing the right thickness also helps extend the lifespan of your deck and reduces long-term maintenance.

At Black Locust Lumber, decking boards are milled with performance in mind. Black locust is an exceptionally dense, rot-resistant hardwood, allowing it to perform well even at standard thicknesses. Its natural durability makes it a sustainable alternative to tropical hardwoods and chemically treated lumber.

Ultimately, the best decking thickness depends on your project’s design, load requirements, and environmental exposure. Consulting with a trusted supplier like Black Locust Lumber ensures you select the right board thickness for safety, strength, and lasting beauty. Proper thickness combined with quality wood results in a deck that performs reliably for decades.