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Blog > How Thick Is Decking Boards
How Thick Is Decking Boards
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Amaryllis Pearl
1 post
May 14, 2026
6:51 AM
The most common question both homeowners ask when they plan outdoor spaces involves decking board thickness which determines both durability and performance. The selection of appropriate thickness needs to be done because it impacts safety and comfort which creates value.

Black Locust Lumber provides multiple standard thickness dimensions for their decking boards to meet various usage needs. Homeowners commonly choose 5/4 x 6 boards which reach an actual thickness of 1 inch. The dimension delivers a cost-efficient solution which provides adequate strength for residential outdoor spaces.

The recommended board thickness for boardwalks and commercial spaces needs to meet heavy-duty requirements through 2 x 6 boards which have a thickness of approximately 1.5 inches. These products offer enhanced weight support which enables them to cover wider joist distances without experiencing structural bending.

Understanding how thick is decking boards thickness. The standard distance between joists remains between 12 and 16 inches so thinner boards need closer joist placement to avoid bouncing and sagging problems.


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