There are many different materials that can be used for decking boards, including wood, composite materials, and plastic. In this example our cross joists will be along the 20ft length. ![]() ![]() Example 01: A 10ft x 20ft ground level deck using composite decking boards & 2圆 treated southern pine joists Now that we’ve covered off the main factors, let’s dive into some practical examples. It’s always best to check your local building codes to see what is allowed in your area. A typical allowed overhang is ¼ to 1/3 of your span table for the lumber you’re using. An overhang isn’t required, but it’s useful to hide the TuffBlocks under the deck. Span tables also gives us an indication of allowed overhang for our joists. Span tables are typically provided by lumber manufacturers and can also be found in building codes and design guides. The tables take into account the strength and stiffness of the lumber, as well as other factors such as moisture content, type of load, and duration of the load. Span tables are used by builders and contractors to determine the size and spacing of the lumber members required to support a given load. Span tables for lumber are tables that provide information on the maximum allowable span of lumber for a given size, species, and grade of lumber when used in various types of construction. Lastly let’s cover span tables in more detail. If you do build a raised deck, then it cuts the number of deck blocks needed by roughly 40-60%. For a visual explanation of this, check out our 3D explainer video showing this in action:Ī ground level deck is often the preferred choice for floating decks because it removes the step up and allows you to walk straight onto it much like a patio or walkway. If you’re building a raised deck with a layer of bearers beneath your joists then you’ll require fewer deck blocks. Is your project raised or is it a ground level deck? For example, with a 10ft x 20ft deck, the number of supports can vary from 32 to 54 depending on whether the joists are along the 20ft length or the 10 ft length. Which direction are your cross joists?Īs you’ll see in examples below, the direction of your cross joists can have a significant impact on the number of deck blocks you’ll require. In general, composite boards require closer joist centres (to remove ‘bounce’), whereas hardwood boards can be further apart.Īdditionally, local building codes may have specific requirements for the spacing of deck joists, so it is important to check with your local building department to ensure that your deck is built in compliance with all applicable codes. However, it is always best to consult the specific installation instructions for the decking material you are using to ensure that the joists are spaced correctly. In general, joists for a deck should be spaced 16 inches on center for rectangular decks and 12 inches on center for diagonal decks. The spacing of the joists will depend on the type and thickness of the deck board material you are using, as well as the design and load requirements of the deck. ![]() Check your local span tables to find out what is required by code. It’s generally recommended that 2圆 or thicker be used for a sturdy deck. The thicker your lumber, the further apart your span supports can be. The size of lumber will determine what your spans will be. This one is pretty self-explanatory, but some decks may have multiple corners or curved edges which affects the number of deck blocks required. Is your project raised or is it a ground level deck?. ![]() What are the dimensions of your project?.Before we delve into any specifics, let’s first cover the main factors that affect our calculations:
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