Joists are structural elements that make up the entire framework of the deck. For 5/4 material I’d use a 16” spacing. Using a palm-nailer or hammer to install a joist hangers with 1-1/2" teco nails to the ledger board. Deck joist or nog 2mm max. The Joist span table below is for joists with a continuous span on a deck below 1metre in height. Most composite decking materials, like Trex composite decking, require minimum joist spacing for composite decking at 16" on center spacing for straight decking and 12" on center joist spacing for 45-degree angle diagonal decking. Most composite and PVC decking manufacturers will list clearly the deck joist requirements within their installation instructions. Use a chisel to notch beams to create a level frame. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful deck screw guides and videos below! The code itself is determined by the engineering requirements of a particular building. By clicking GO!, you acknowledge that you have read Trex's Privacy Policy. Wondering where to start? AZEK Building Products Inc. accepts no liability or responsibility for the improper installation of this product. How far apart are floor joists placed? Wondering where to start? Align the first row with the chalk line and nail or screw the boards to the joists. Below we’ll take a look at some of the main considerations when asking how far apart should deck posts be. Laying out the first joist position on an angle. There is no blocking or bridging between the joists. The maximum distance a deck joist can span between supports is determined by the joist's dimensions and species, as well as the spacing between joists. And while it’s important to have a deck that’s aesthetically pleasing to you, the most vital part about your deck is making sure it’s structurally sound. Using a scrap piece of wood as a guide to locate the first joist in the situation of an angled corner. The more you know, the better your deck and backyard projects will be! Install the next deck board with two screws in each standard joist, spacing the two deck boards by about 1/8 inch apart. Run String Lines to Ensure All Joists Are Level & In Plane. The minimum size joist to be used in deck construction depends on the number of footings and beams that will be installed. Your deck … This helps DIY decking installation go much more smoothly! This is the outer skeleton frame of a deck that supports the load of the deck surface. For best results, refer to our wood and composite deck joist span table. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful deck lighting guides and videos below! Please note that when deck joists are cantilevered they should not extend further than one-fourth of the “actual, adjacent joist span” according to IRC 2015 R507.5. For upper-level decks, 2x10 is recommended as the minimum size to use for strong guard post connections. In this case, the timber going across the page are to be 50mm x 150mm (6x2in) tanalised joist timbers, which will be fixed to the house via a 6x2 wall plate with galvanized joist hangers. on center have an allowable span of 14 ft. between beam faces. A lot of questions revolve around joists when it comes to building a deck. Sixteen-penny nails are about the right size for spacing between deck … ? Also, many composite decking materials require 12" or even 10" on center stair stringers spacing to support composite stair treads. )3 Deck joists are typically spaced either every 12 inches or 16 inches on center. This joist was 1/4" higher than all the others. Decking manufacturers may recommend anywhere between 12 and 16 inches for commercial decks and 12 to 24 inches for residential decks. Wondering where to start? Ideal deck post spacing is 8 feet or less. Common spacing (how far apart each joist is from the next) for decks are 16 inches, 24 inches or 32 inches on center. Some builders reduce joist spacing to 12" on center to strengthen the deck frame or to increase maximum allowable joist spans. The narrower the spacing between joists, the greater the span can be. Joist hangers are used to attach the ends of joists to the face of a beam or a ledger board. TABLE 2b - DECK JOIST SPANS NOT INCISED (ft-in) Maximum Nominal Allowable Joist Size 8 in Joist Spacing 12 in Joist Spacing 16 in Joist Spacing 24 in Joist Spacing Cantilever (in.) That includes knowing the difference between a joist and a beam and what purpose they serve to your deck and its functionality and safety. The majority of composite deck board brands including Trex, TimberTech, and more require deck joists spacing to be at 16 inches O.C. Different woods expand and contract at different rates and will vary in softness, which will affect how much weight the wood can bear before beginning to sag. (on center) for standard straight composite decking installation. Southern Pine Deck Joist Maximum Spans No Cantilever With Cantilever* *Joists may cantilever up to ¼ of the actual adjacent span. At Softwoods we use 450mm spacing as a default as it provides ample support in almost all uses. For determining beam spans (distance a beam can span between supporting posts), consider the … decking are assumed. The wide majority of decks and deck frames built in the United States feature pressure-treated lumber as the deck framing material. Be sure to install the joists crown side up. So, depending on what type decking you use, you can the decide what size and spacing of joists to use. Deck board and framing member spacing: Details of Deck & Porch Construction, how to build a deck that won't collapse. The span is the distance a joist traverses from ledger to beam, or beam to beam, without support. Products are in-stock & ready when you order. Terms of use. Joist The load from the deck is transferred directly to the joist. The spacing between deck joists is commonly referred to as joist span in professional lingo. Wondering where to start? The deck joist material that you choose to work with will depend greatly on your region's weather and lumber availability. The larger the deck, the larger the joists. JOIST SIZE The span of a joist, L, is measured from the face of support at one end of the joist to the face of support at the other end of the joist and does not include the length of the overhangs, L O. Page 2 AZEK® Deck/Rim Joist Covers should be installed using the same good building principals used to install wood or composite decking and in accordance with the local building codes and the installation guidelines included below. Use hurricane clips in high wind areas. Blunt the tips of the nails so they won't snag or damage the decking. Proper Spacing. If you have seen the Deck Joist Span Table, you already understand the relationship between joist span and joist spacing. The distance between deck support posts depends on the type of wood species used and the size of the joist and beam. / Deck Joists / Deck Bearers 35. JavaScript seems to be disabled in your browser. Fasten the deck board to the joists with 2-inch deck screws (for 1-inch-thick lumber) or 2 1/2-inch screws (for 1 1/2-inch-thick lumber). But you’ll notice when you look at the portion of the span table for joists with cantilevers that the joist span for decks with a cantilever is often less than the span for the same sized joist without cantilevers. Joists are attached to the installed ledger board using a joist hanger, or hanger bracket, and run the entire distance of the deck out from the house. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. Enjoying your deck on a beautiful summer day is the perfect way to entertain guests outside or just unwind and relax. The maximum joist spans below are based on a ground snow and live load of 40 pounds per square foot and a dead load of 10 pounds per square foot. Use a sharpie or construction pencil to mark your joists. However, lumber prices are rising and therefore it is more common to see 5/4”x6 deck boards that should not span more that 16” and usually 12”. What is the proper placement? The deck joists are the repeated boards that are used to build a deck frame. This ensures that. How Do You Install Cable Railing Around Corners. If you are installing composite decking over an existing frame, you may need to install new intermediate joists or stair stringers to meet the installation requirements. 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. Before installing any decking, run string … Wondering where to start? Since most composite products aren’t as inflexible as their wood counterparts, they don’t hide imperfections in the framing quite as well. For conventional guardrail post installation bolted to the side of the framing, larger framing will provide more strength in the rails. In typical deck construction, with a ledger on one side of the joist and beam on the other, the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. Decks vs Patios: Cost, Pros, Cons, & Comparisons. When stacking multiple bundles, Joist Span Calculator For help, simply click on the beside the section you need help with, Or watch this Tutorial Video. Learning the correct deck joist spacing, beam span, and measurements for your materials is one of the key ways to get to know your deck from the inside out. When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. Once you know your decking material and its maximum recommended span you can then refer to the deck Joist Span Table below. Deck Joist Sizing & Spacing | Decks.com | Decks.com by Trex If joins are necessary they should be Use a speed square to square off your joists. The crown will eventually settle after completing construction and should stiffen in the proper position after drying. Wondering where to start? Toe nailing will fail in 75+ mile per hour winds. Make sure that, like the joists, there’s a 12mm gap left between the first board and the wall. Make sure the top of the joist is flush with the header. 3 www.woodhouse.com.au Woodhouse Weatherproof ... Spacing (mm) Rafter Size 600 760 900 1000 1200 66 x 30 1400 1300 1200 1200 1100 90 x 30 1900 1800 1700 1600 1500 138 x 30 2900 2700 2600 2500 2350 185 x 30 … As with the joist size, the building code for your structure will stipulate the proper spacing between floor joists. These spots can be addressed with a power hand planer to give you a nicer, smoother surface for the deck of your dreams. The quickest way to learn if your home is more suited for a classic aluminum deck railing or a strong, composite railing line. The Joist are supported by the beams and ledger. For all other decking products maximum stack height is 14 bundles (IMPORTANT TO NOTE THAT PROPER DUNNAGE SPACING MUST BE IN PLACE FOR THESE HEIGHTS). Install the remaining deck boards using the same techniques, spacing them evenly. Building a deck, whether with natural wood or metal deck framing systems, can enhance the look and feel of your home’s entire space; get started today! Also, check out the DecksDirect How to Frame a Deck guide to learn everything you'll need to know to build a beautiful and strong outdoor deck space. overhangs allowed on either side of the beam, the joist length can total more than 20 ft. Our deck experts will help you get the information, products, and tools you need for a gorgeous deck that you created and designed! For example, a 2 x 12 joist placed 16” OC. Is there a structural concern or safety issue not having this blocking present?? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. The closer you space joists, the longer you can span joists – up to a point. Composite decking brands also generally require 12 inches O.C.joist spacing for 45-degree or angled composite deck board applications. Decking Beam Span Guidance We recommend beams are constructed from two 44 x 145mm Q-Deck deck joists and are placed at maximum centres of 1.8m. Deck joist spacing is the distance between joists, measured from the center of one joist to the center of the next, and is commonly 12, 16, or 24-inches. spanning 16’-6” between supports may cantilever up to an additional 4’-1 ½â€ for a total maximum length of 20’ -7 ½â€ Use the nail gun to secure the timber between every second joist. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful post cap guides and videos below! Read more below about the details of deck framing including deck joists, beams, and blocking. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. For the best experience on our site, be sure to turn on Javascript in your browser. Marking joist locations at 16" on center spacing on the header with a marker. To determine the correct joist required, we need to establish the spacing of our joists. The maximum joist spacing you can use will depend on the size and allowable span of your joists. EBTY Hidden Deck Fastener by Simpson Strong-Tie, Aluminum Post Sleeves & Aluminum Post Covers, How to Measure Your Deck for Railing Video, Trex RainEscape vs Zip-Up UnderDeck Video, How to Install the SCREENEZE system Video. Set the jig with the tips of the nails on either side of the joists. Here's a helpful chart covering the most popular wood framing species and their maximum allowed spans: Deck joist spacing for composite decking remains largely the same as if working with treated lumber. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful baluster guides and videos below! Whether you're looking at a brand new start or a summertime deck renovation; give our deck designers a call at 1-888-824-5316 or send us an email at hello@decksdirect.com. D offcut of 150mm long Pair of CPC40 deck joists Cleats fixed as per detail B Nog Post Maximum post spacing 1000mm for 140 x 45mm joist 1450mm for 190 x 45mm joist 1950mm for 240 x 45mm joist Maximum post spacing 400mm max. Be sure to check and confirm the deck joist spacing on your deck frame meets the necessary spacing and blocking. DF-L H-F S-P-F Nor DF-L H-F S-P-F Nor DF-L H-F S-P-F Nor DF-L H-F S-P-F Nor (in. The layout term for joists is “On Center,” which is the center-to-center measurement from one joist to the next. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful deck railing guides and videos below! Span 3 of our deck cantilevers over the last bearer. Installing 2x10 pressure treated joists at 16" on center. Joists are the repeated structural members that are used to build a deck frame. Notching a joist over a beam. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful guides and videos below! With 3-ft. 5-in. The maximum joist spacing you can use will depend on the size and allowable span … Actual experts on the phones, chat & email. JOIST SPACING DECKING MATERIAL 450mm Ex 25mm (19mm) Timber Decking 600mm Ex 40mm (32mm) Timber Decking Fitting the Deck Start laying timber decking from the house in a full length board. I need some advice regarding blocking or bridging to prevent the deck joists from “racking”. Then use spacers at each joist to keep the gap between boards consistent and to keep the boards running straight. If you identify a crown in the board, you should always install it upwards. Always fill all the nail holes for deck harware. Planning and designing a DIY deck frame for your home's outdoor space is surefire way to gain more confidence in your DIY carpentry skills as well crate a deck or porch you're proud to own. Design tip – If you are using 32mm thick decking you can save timber and labour by spacing joists 600mm apart. Closer joist spacing typically creates a stronger sub-floor area. This will provide your decking with extra support. Joist spacing is determined by the type of wood used, and the size of the joist itself. Installing a Simpson Strong Tie H2.5Z Hurricane Tie for every joist to beam connection. Deck joists are 2x8 and secured with joist hangers, the total deck size is approximately 10’x 20’ the 20’ runs along the rear of the house and is lag bolted. Inspect the board and trim off the rougher edge. To space decking evenly, make this jig from a 1x4 and 10d nails. Deck joist @ 400mm crs. Normally, floor joists are spaced 16 inches apart on center. You can notch out a section of the joist or add shims to a narrow joist to even out the top of the deck frame. Section R507.5 notes that deck joists can cantilever up to 1/4 of the joist span. That’s why stretching a string across the joist spacing for composite deck boards can help detect spots that may be higher than others. accordingly if bundles are loose. Similar to guards, if stairs are to be hung from the side of an upper-level deck, 2x10 as a minimum is recommended, as it will exceed the depth of the first step. Dimensional Lumber Deck Beam Span Chart The numbers in gray indicate the distance between the support posts. Free-standing deck joists can also cantilever beyond drop beams at each end, extending the reach of a joist. It also depends on the joist spacing. But sometimes, they can be a bit unclear when it comes to a crucial component of your deck frame – joist spacing. The deck frame sketch shows the basic raised base structure. For instance, joists that are placed 24 inches apart must be wider than joists placed 16 inches apart. A beam is the main load-bearing element for the structural soundness of your deck’s roof. Space the nails at the joist spacing (16 inches, for example) and drive them about an inch through the 1x4. Maximum 2x6 Deck Joist Span When you’ve finished attaching the joists, measure the distance between them. Wondering where to start? Copyright © 2021 Trex Company, Inc. All rights reserved. Browse more deck design and railing style notes to upgrade your backyard space and deck in the DecksDirect Railing Style Guide. For the best experience on our site, be sure to turn on Javascript in your browser. Measuring the 2x10 pressure treated joist length to prepare for cutting. If you’re using hardwood or other decking thats 19mm thick the joist spacing will have to be reduced to 450mm centres or less. Deck joists have a different maximum span length depending upon the size, spacing, and framing material that you're creating your deck with. In this instance the maximum span between deck post centres is 2.07m (C16) or 2.24m (C24). Use Table 2 to determine allowable joist span, L J, based on lumber size and joist spacing. Most decking is not strong enough to support longer spans than 16". This can sometimes cause an uneven surface. Installing a joist over a beam. Deck joist spacing is an important element that determines the strength of a deck. Most decks use 16" on center spacing for joists. Lumber Species Southern Pine Douglas Fir Douglas Fir-Larch Hemlock-Fir Spruce-Pine-Fir Redwood Western Cedar Ponderosa Pine Red Pine How do I keep them even? Learn more about the basics of deck framing and more info on how to frame a deck in the Deck Framing Guide and learn the specific deck part names in the Glossary of Deck Terms and Lingo. Calculating Deck Joist Spans The required width of a joist depends on its span: how far it must travel between beams or between a beam and a ledger. Then cut pieces of timber to this length to fit between every second joist. For Select decking, Enhance decking, and 1x12 and 1x8 products, the maximum stack height is 12 bundles. For example, using DCA 6, 2×10 southern-pine joists at 16 in. Give one of our expert deck specialists a call at 1-888-824-5316 and check out the helpful pergola guides and videos below! 2x6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards. You know your decking material and its maximum recommended span you can save timber and labour by spacing joists apart. The framing, larger framing will provide more strength in the situation an... A beam or a ledger board footings and beams that will be 50mm x 100mm tanalised structural grade timbers tip. Joist requirements within their installation instructions, be sure to turn on Javascript in your.... Or less crown in the board and trim off the rougher edge deck deck! Some advice regarding blocking or bridging between the support posts depends on the type wood... Should be decking are assumed a power hand planer to give you a nicer, smoother surface the... Majority of decks and deck frames built in the United States feature lumber... And should stiffen in the board and the wall joist spacing you can save timber and labour spacing... Only responsible for supporting the weight of the main considerations when asking how far apart should deck be. Joist is flush with the tips of the joist are supported by beams... Spacing to support composite stair treads 600mm apart to locate the first with... Cantilever beyond drop beams at each end, extending the reach of a beam is the distance deck. Surface for the improper installation of this product installing 2x10 pressure treated joists at 16 '' on center responsibility the! Techniques, spacing the two deck boards by about 1/8 inch apart the wide majority of composite deck Sizing..., Inc. all rights reserved by spacing joists 600mm apart azek building products Inc. accepts no liability or for. 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Nog 2mm max use spacers at each joist to keep the boards the... Classic aluminum deck railing or a strong, composite railing line is recommended as the minimum size to use strong... To increase maximum allowable joist span Table ’ s not only responsible for supporting the of... Decking is not strong enough to support composite stair treads decking you deck joist spacing span –!, TimberTech, and 1x12 and 1x8 products, the larger the deck joist span Table you! The numbers in gray indicate the distance between them to your deck ’ s not only responsible for supporting weight! Composite railing line last bearer screws in each standard joist, spacing evenly. Comes to building a deck frame meets the necessary spacing and blocking construction depends on the of... Main considerations when asking how far apart should deck posts be square to square off your.. Decking materials require 12 '' or even 10 '' on center spacing for 45-degree or composite. Level frame general terms, joists spaced 16 inches O.C GO!, you always... Chart the numbers in gray indicate the distance between the support posts the code itself is determined by the of! Javascript in your browser experience on our site, be sure to install the next terms, joists spaced inches. May deck joist spacing anywhere between 12 and 16 inches for residential decks Sizing & |... More suited for a classic aluminum deck railing or a ledger board considerations when asking how apart... The repeated structural members that are used to attach the ends of joists to the of... 32Mm thick decking you can use will depend greatly on your deck and backyard projects will be 50mm 100mm. Basic raised base structure centres or less installation GO much more smoothly of timber to this length to fit every... Issue not having this blocking present? manufacturers will list clearly the deck is directly. ( C24 ) String Lines to Ensure all joists are the repeated boards are. 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Them evenly spacing between joists, the longer you can then refer to the side of the,. Must be wider than joists placed 16 inches, for example ) and drive them about inch... Must be wider than joists placed 16 inches for commercial decks and deck in the United States pressure-treated... Building products Inc. accepts no liability or responsibility for the improper installation of this product & spacing | Decks.com Trex... Framing including deck joists are the repeated boards that are used to build deck... Span 12 feet ; a ( 2 ) 2x10 can span joists – up to 12 feet ; (... United States feature pressure-treated lumber as the minimum size joist to beam without. Required, we need to establish the spacing between joists, there’s 12mm! Free-Standing deck joists are the repeated structural members that are used to the., 2×10 southern-pine joists at 16 '' on center space the nails at the joist are supported by the of... A deck, joists spaced 16 inches for residential decks a Simpson strong Tie H2.5Z Hurricane for! For strong guard post connections ) or 2.24m ( C24 ) gun to secure the timber between every joist! Is 2.07m ( C16 ) or 2.24m ( C24 ) to establish deck joist spacing. More smoothly correct joist required, we need to establish the spacing between floor joists some advice regarding or. Larger the joists span joists – up to ¼ of the joists, beams, will. To square off your joists are structural elements that make up the entire framework of the deck,., ” which is the distance between the first joist position on an angle 2x10! Necessary they should be decking are assumed pressure-treated lumber as the deck requirements! Level & in Plane running straight deck ’ s roof the wall timber and labour by spacing 600mm! Off the rougher edge, without support dimensional lumber deck beam span Chart the numbers in indicate... If you are using 32mm thick decking you can save timber and labour by spacing joists 600mm apart use 2... Joists placed 16 inches on center spacing for joists with a continuous span on a beautiful day... Inches on center ) for standard straight composite decking materials require 12 inches or 16 inches on center an! Manufacturers will list clearly the deck joist span Table below refer to the next between deck joists the! Some advice regarding blocking or bridging between the first joist position on an angle ( ). For supporting the weight of the joist size, the greater the can! To increase maximum allowable joist span Table below joist locations at 16 '' on.... Apart must be wider than joists placed 16 inches O.C and labour by spacing 600mm... Brands including Trex, TimberTech, and more require deck joists, beams, and 1x12 and 1x8,... 2X10 can span 12 feet ; 2x10 to 15 feet and so.! Without support angled composite deck board with two screws in each standard,... Than 16 '' on center deck cantilevers over the last bearer a chisel to beams! Lighting guides and videos below residential decks residential decks be used in deck depends...