Red pine decks can last up to 30 years with proper maintenance. It is often used for decking because it is strong, weather-resistant, and naturally resistant to decay. Red pine is a type of wood native to the eastern United States. There are also fewer color choices than redwood or cedar decking options, so it may require painting if you cannot find what you need in the natural form of this lumber species. It has always been popular for building because it was readily available at a low cost.Ī disadvantage for some homeowners is that Ponderosa Pine often contains knotholes or other defects that require extra work during deck construction. It ranks high in strength, weather resistance, and durability. Ponderosa pine is a type of wood that is good for building decks. Western cedar decks can last up to 30 years with proper maintenance. They are often used for decking because they are strong and weather-resistant and naturally resist decay. Western cedars are a type of wood native to the Pacific Northwest. Redwood decks last longer than other decks made from less expensive wood species. Redwood can also be stained or painted to match any color scheme. It is one of the most popular types of lumber used for decking because it is strong and weather resistant. Redwood is a type of wood that is native to North America. Spruce should not be utilized in areas with a lot of humidity or snowfall because it can quickly become damaged. It’s a decent choice for regions where moisture is likely an issue since it won’t warp or decay rapidly. Spruce is the least expensive species but has the lowest strength rating. This wood has comparable properties to Douglas fir and can be used in most situations. Hem-Firĭouglas fir is not readily available in some areas, so hemlock-pine (also known as “Hem-Fir”) is a good alternative. The major disadvantage of Douglas fir is that it may be costly compared to other woods and isn’t readily available in some locations. It’s robust, resilient to shrinking and warping, and comes in long lengths. Douglas Fir-Larchĭouglas fir is the most common wood used for floor joists and roof rafters. The major disadvantage is that it’s vulnerable to decay and termites. Southern pine has several benefits compared to other woods, including being inexpensive. Southern Pine is a good choice for floor joists since it is strong and resistant to shrinking and warping. Many homeowners are looking for an excellent resource to assist with the sizing and spans of deck joists. If you’re a homeowner looking to build a deck, you’ll need to know the requirements of the IRC’s joist sizing and spans. Table R507.6 gives maximum span lengths for different-sized wood joists based on their location, species, size, and spacing. This section covers conventional lumber sizing, spacing, and spans. One of the most critical sections of the IRC when it comes to deck joists is Section R507. The IRC covers everything from minimum floor joist sizes and spacings to allowable roof loads. It’s updated every three years, and the 2018 edition was released in November of 2017. The IRC is the governing document for all residential construction in the United States. 2018 International Residential Code (IRC) Exterior Decks Decks holding hot tubs will require reinforcement and closer joist spacing. Deck joist spans depend primarily on how much weight the deck will bear. Deck joists come in dimensional lumber lengths from 8 to 16 feet.Īs discussed in this article, deck joist span is important for designing decks to support heavy loads. If you’re unsure what size deck joists to use, don’t worry – we’ll discuss this in the next section.ĭeck joists are generally 6, 8, 10, or 12 inches in width, with 8 or 10 inches as the most common sizes. Deck joists are measured in inches by thickness (e.g., “a deck joist is a 10-inch floor joist”). In most cases, your deck joists will need to be at least a certain size to support a live load of 40 pounds per square foot. The IRC also has regulations for minimum joist sizes. The deck joist spacing you choose will depend on several factors, including the size of your deck, beams, the deck foundation, and the type of decking you plan to install. Deck joist spacing usually is 16 inches on center but can vary between 12 and 24 Inches. Conclusion What is Deck Joist Span and Spacing?Ī deck joist span is a distance between two load-bearing points.
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