joist spacing for 5/4 cedar deck boards
(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 isnât 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 2âx6â plank will flex more when supported at 24â OC than the other two distances, and a 5/âx6â will flex more at 16â OC than at 12â 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 isnât 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. (2â x 6âx 12â = $5 to $9), Wood, commonly pine, protected from fungus and insect damage with chemicals that have been forced into the wood with pressure. 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