Answer
Jun 20, 2025 - 12:32 PM
The support structure for composite decking typically consists of a framework made from pressure-treated lumber or metal, such as steel or aluminum, which provides a sturdy base for the decking boards. This framework includes joists, beams, and posts that are properly spaced and secured to ensure stability and durability. The joists are usually spaced 12 to 16 inches apart, depending on the manufacturer's recommendations, to adequately support the composite decking material. If you are installing boards diagonally, 12" joist spacing is required, if straight 16". If you currently have 24" joists, you may need to add additional blocks for added support.
