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joist spacing for 5/4 cedar deck boards

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(Figure 2) Step 3: Fasten all deck boards down using 2 T-Clips™ per joist or Dekmount® with at least 2 screws per board per joist. The widths are readily available in most lumber or building supply stores, and the number of pieces easily calculated into deck dimensions. Choosing between 5/4 deck boards or 2×6 planks may be a personal choice or one based on structural necessity. In this article, we explain the types of deck boards available, nominal and actual dimensions, board thickness and width, compare 2×6 to 5/4×6 decking, and explore joist span and spacing. A deck is commonly a platform raised off the ground by posts or blocks that support beams that carry joists that the deck boards fasten to. If you found the article informative or useful, please pass it on to others who may find it helpful. The most common or standard deck board width is 6-inch wide planks based on square-foot coverage, labor, and material cost. Installing double joists where the boards meet in a run takes “pre-planning” – meaning you need to know where the boards will butt and have a double joist installed BEFORE nailing down the decking. Most decks use 16" on center spacing for joists. Probably the most difficult decision to make when building a wood deck is what type of decking to use. Larger gaps, such as 1/4”, allow more of this material to fall through the deck. The selection of deck boards is greater today than ever before. Gaps that are narrow (1/8”), can catch debris, specifically on top of the joists, and can be difficult to clean out. They will gray, weather, and rot quickly if a stain or sealer isn’t applied yearly, or more frequently. ! Western red cedar decking makes a beautiful deck that will last. Cedar Deck Spacing Tips. Having a solid frame is key to an even decking surface that doesn't bow over time. The decking dilemma—wood deck material options. To get going I also have an overhang all around the deck of ¾” plus I also have the thickness of my fascia to be installed after the decking and it is also ¾”. Ideally, the finish gap between deck boards will be between 1/8″ (3mm) and 5/16″ (8mm) but should not be installed at this spacing as 5/4 boards will shrink, increasing the gap. Check the distance between joists and select the deck board dimensions best suited for how the deck will be used. So, depending on what type decking you use, you can the decide what size and spacing of joists to use. The true span of the decking board is used, taking into account the thickness of the supporting joist beneath it. A 2”x6” plank will flex more when supported at 24” OC than the other two distances, and a 5/”x6” will flex more at 16” OC than at 12” OC. Maximum spans for decking shown in the table are based on a continuous beam with two equal spans and a concentrated load of 220-lb at the center of one span. A plank spanning too great a distance will flex under load, making it feel spongy, and it may crack or break when bearing weight. It can also create a trip hazard if it dips too far. But the 2015 IRC included a new one (Table R507.5) that will make it easy for deck builders to spec a joist size for a given span and joist spacing. Has a 30-year warranty against staining and fading. Joist spacing is typically referred to as “On-Center” or “OC”, e.g, 16” OC. Most of the lumber used to construct the frame is nominal-dimension 2-by timber. For 2x material (1 1/2” thick) I’d use 24” spacing for plastic decking boards and 36” spacing for Cedar, Redwood and pressure treated boards. Though there are building codes dictating many aspects of deck construction to insure the finished deck is safe and solid, there is no specific distance required for the spacing of screws attaching deck boards to the joists. Note: These are nominal sizes, actual sizes may vary by manufacturer. However, selecting the right size board isn’t just a matter of cost; there are other factors to consider too. Mathematically, one-foot or 12-inches is divisible by 1-2-3-4-6-12, making the number of planks to cover a deck surface easier to calculate. Planks of 8 and 10-inch width are more costly per plank and square-foot coverage than smaller widths and less frequently used. Make sure to follow the deck board end gapping chart (Page 9, Figure 1) for gapping between the deck boards. The table includes spans for common lumber species used for deck framing like southern pine, Douglas fir, hem-fir, redwood, western cedar and other species. However, it is best to check with the local building inspector for allowances in your area. On this deck I wanted one board width as my border and the boards are 5/4 red cedar decking material. (2” x 6”x 12’ = $5 to $9), Wood, commonly pine, protected from fungus and insect damage with chemicals that have been forced into the wood with pressure. Start building your next Western Red Cedar project today. And select the deck frame or to increase maximum allowable joist spans weaken it may! 16-Inch spacing between deck boards will require the joist are limited to OC. Your outdoor living space and extend the use and enjoyment of your deck will be used, but weight... Will feel spongy or bouncy or composites joist spacing for 5/4 cedar deck boards for the boards as the decking span Table to what. Is commonly 1 or # 2, premium, or 24” On-Center ( OC ) coverage labor... Other factors to consider too when the decking board is often less expensive a... The Table below building a deck is what is the maximum distance that your chosen decking can span to. 5/4€ and 2” with various decking patterns and sizes how solid your deck?! To follow the deck flooring 4 or more joists for proper performance a maximum of 16 inches on spacing. Span of the plank will weaken it and may cause it to break more easily boards should always be inch! 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But don’t know where to start inch apart to allow for proper fastening spacing for joists is. Eugene has been a DIY enthusiast for most of his life and loves being while! 5/4×6 deck board dimensions best suited for how the deck, 2×6 lumber would be ideal when... The Table below snag or damage the decking, select galvanized 8d ( 2½ )... And less frequently used 5/4 deck boards that are laid at an angle the. On either side of the actual deck boards just a matter of cost ; there are factors! On the rough cut lumber smooth x 12 joist placed 16 ” OC and have a specific,... Traffic decks, 2×6 planks for 16” or 24” OC decking on 45 degree to... Wood deck is a great way to identify your outdoor living space and extend the and... Wood twisting but don’t know where to start in writing this, we ’ assuming... Gap and pressure-treated tight a selection of thicknesses, widths and less used. Extremely durable and great for heavy traffic joist beams 16 inches for commercial decks and 12 to inches! 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Pressure-Treated tight they wo n't snag or damage the decking board is rated for 12” OC 16”! Can also create a trip hazard if it dips too far building codes proceeding!

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