Depending on how much weight they will carry, they need to be sized accordingly. Floor joists come in dimensional lumber lengths from 8 to 16 feet or more.Īs mentioned above, floor joists support most of your home’s weight and play a crucial role in structural integrity. If you’re unsure what size floor joists to use, don’t worry - we’ll go over this in the next section.įloor joists are generally 6, 8, 10, or 12 inches in width, with 8 or 10 inches as the most common sizes. Floor joists are measured in inches by their thickness (e.g., “a floor joist is a 10″ floor joist”). In most cases, your joists will need to be at least a certain size to support the weight of your home. The IRC also has regulations for minimum joist sizes. The floor joist spacing you choose will depend on several factors, including the size of your home frame, load-bearing walls or beams, the foundation, and the type of flooring you plan to install. Floor joist spacing usually is 16″ apart but can vary between 12″ and 24″. The floor joist span is the distance between two load-bearing walls or beams. Why Home Inspections Are Important Floor Joist Span and Spacing Explained
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February 2023
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