Adding a deck to a home or yard is a great way to create an outdoor living space. The free end of the joist often either rests on the beam or cantilevers over it. Placing the beam so the outside face is 12’ from the structure or 10’-6” doesn’t affect the cost, but does impact the structural strength. The spacing of your posts will also change if you don’t attach your deck to your house, or if you opt for 4×4 instead of 6×6 lumber. The drawback when using 4x4s is that you cannot use a three-ply beam – it won’t fit on top of the 4×4. The list should also include the number of joist hangers, hurricane brackets, and post-to-beam caps. BEAM SIZE & ASSEMBLY REQUIREMENTS Deck beam spans shall be in accordance with Table 3 and can extend past the post face up to LB/4 as shown in Figure 3. for perpendicular and 8”o.c. One way is to pour concrete in the post hole, set the post on the concrete and backfill with gravel. The span of deck joists depends on the selection of dimensional lumber available in your area. Some equations and algorithms will calculate the span and spacing for joists and numerous joist span tables for reference too. Windows, trees, neighbors, and utilities are other factors to keep in mind. Most calculators allow for the selection of three or four common wood types or species, standard dimensional lumber from 2×6 to 2×12, and on-center spacing of 12”, 16”, or 24”. The boards and furnishings rest on a deck frame of joists supported by beams, ledger, posts, and footings – all are important. The frost line and snow load tables in Florida are different than Minnesota, so code has to take that into account, for example. He is passionately interested in home improvement, renovation and woodworking. Regardless of the method used, span and spacing depend on the type and grade of the wood, cantilever, beam size, height off the ground, footing size, and live load values. The distance between deck support posts depends on the type of wood species used and the size of the joist and beam. or less spacing, and 2” planks are limited to 12”o.c. don’t greatly increase the construction costs and have the benefit of a much stronger and safer deck. The other deck, with 12’ joists, can have support posts at 7’6”, max. A Joist Span calculator commonly identifies the maximum span and cantilever for dimensional lumber joists based on wood type, joist size, and spacing between joists. can span 9’-11” but that drops to 6’-8” with a cantilever. If you live in a snow-belt and need to clear the deck, it’s easier to push in the direction of the boards than across them. when perpendicular to joists. Eugene has been a DIY enthusiast for most of his life and loves being creative while inspiring creativity in others. It is also less expensive than select or #1 grade wood. Lower grades, economy, or utility lumber have too many knots or large knots that weaken the lumber too much for structural use. REMEMBER THESE THINGS. ... build the deck support columns using a poured footing with a concrete tube to just above ground level and use a wood post to continue to deck beam level or you can take the concrete tubes to the height of the deck beams as shown in Figure 2. Deck joists are planks laid on edge in a spaced pattern to which the deck boards are fastened. Shape of the Deck BEAM SIZE & ASSEMBLY REQUIREMENTS Deck beam spans shall be in accordance with Table 3 and can extend past the post face up to L B /4 as shown in Figure 3. JOIST SELECTION CHART Joist Size Maximum joist span between bearers at specified joist spacing 450mm 600mm 90 x 45mm 1.15M 1.00M 140 x 45mm 1.85M 1.60M 190 x 45mm 2.50M 2.15M Most codes in North America offer charts that will take into myriad factors that we’ll talk about, plus we’ll go over how to read those charts, as they can be confusing. The height available from ground level to entry-level may trigger the need for landings or the inclusion of a lower deck. Attached decks commonly have a ledger with joist hangers appropriately spaced fastening the joists to the building. The dead and live load the deck will carry helps set the span and spacing of joists and joist dimensions. Knots and defects affect the strength of the timber, making it weaker. Residential Deck Construction Guide ... All deck support posts shall be a minimum 6”x6” with a maximum unsupported height of 10’-0” ... span decks have more than one beam; spacing between beams is dependent on the allowable span lengths of the supports joist. It is available in green or brown tones of preservatives, so the color is reasonably consistent. Start at the center of the rail and work toward the … Check out the calculator below. Remember to check your local building code before putting any shovels in the ground. However, you can still orient your joists to ensure the fewest amount of deck posts are required. Most manufacturers have deck joist spacing stipulations similar to 5/4 decking, however, some boards are rated for greater distances. ), and the height off the ground. It provides a warm wood glow that many appreciate. Smaller beams require more support posts, so any money you gain by purchasing 4x4s instead of 6x6s is more than likely lost because you’ll have to dig more footings to accommodate the weaker 4×4 support posts. Cut the Posts. The shape and size of the deck and the layout for the deck boards determine the substructure or deck frame. when perpendicular, and 16”o.c. Some formulas take the bending, compression, and breaking values for wet or dry wood that are based on predetermined values for different species to determine safe loads over specified distances. It is advisable to retain the services of a Structural Engineer for correct calculations, especially for decks of large dimensions, loads, and heights. Most decks have joists that are attached to a ledger board, which is affixed to the house. We recommend this joist span calculator, which has the following functions: Deck joist span tables commonly identify the maximum span for different wood types and joist spacing. Many North American municipalities follow the guidelines set out by the American Wood Council, which offers a comprehensive deck post spacing chart (Table 3A): Understand that the above chart is only a guideline – many municipalities are not as strict as the AWC. The Codes identify maximum joist and beam span requirements for different wood types to ensure decks don’t sag or collapse under the weight of people or snow load. If you found this guide helpful, please share it with others. Materials Decks must be constructed of long-lasting, moisture-, rot-, decay- and insect-resistant materials. That leaves one beam to be supported by two or more posts. If the joists are 8’ long, then you can only place your deck support posts at a max of 7’4” apart. The wood needs to be cleaned yearly and have a water-proof boost every other year, depending on your climate. Unfortunately, if you step down to a three-ply 2×10, you would still need 3 deck support posts because a beam of that size spans just under 10’. Luckily, there are tons of handy charts to help get you started. Once the deck surface is dry, apply a deck “brightener"* to the deck as directed by the manufacturer. Joist Spans for #2-Grade Dimensional Lumber, Redwood, Western Cedar, Red Pine, Ponderosa Pine. It is better to go shorter than to try and maximize span bridging for a more solid and secure platform. A shorter beam span means more deck support posts. Figure 2. Joists commonly are spaced at 12”, 16”, or 24” centers depending on the load the deck frame will carry and the size, type, and orientation of the deck boards. Free-standing decks don’t have a ledger. Beams must sit on top of deck support posts, using code-approved fasteners. For example, most decks have joists that are spaced 16” on center. The last factor is also the size of the footing. The top of the joists are level with the top of the beams or ledger and beam, making for a thinner profile deck structure. Deck Brighteners contain oxalic acid, which will also remove tannins. Tables and span calculators frequently provide joist dimensions, span, and spacing values based on a dead load of 10 pounds per square foot (PSF or psf) and a live-load of 40psf. Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted. 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. I am looking to install privacy screens on my concrete patio. Joist Span – Joists Attached at House and to Side of Beam. For those in Canada, many consider tables from Ontario and deck support post information found in tables from British Columbia are helpful. That affects the joist and beam directions, as well as the live load requirements. The first step to building any deck is determining the size, creating a scaled 2-D … and 16”o.c. I'm burying 4x4 posts in Concrete as I did with my large fence. We’ll assume that one side is attached to your house so that you will need only one support beam because your joists are perpendicular to the house. Round up to the nearest whole number, then subtract 1. This is good if you are looking to save a few dollars; however, code will not allow you to space your deck posts as far apart beneath your beam when using 4x4s. A beam of that size can span nearly 12’ while supporting 10’ joists. Once the plan is complete, a material list can be generated for building materials. Therefore, if you want to minimize the amount of deck support posts, go 6×6 instead. Ice and Snow A plastic shovel may be used to remove snow from the deck. One of the biggest is knowing what your local building code allows. The dead load is the weight of all the building materials and is commonly calculated at 10psf. A hot tub may be part of the purpose but it affects the shape and size of the deck too. Joists that cantilever allow for the use of longer joists than those that terminate at the outside face of the beam. Once again, thanks for taking the time to read this guide. For instance, if you want to build a deck to fit your circular, above-ground swimming pool, then you are going to need a number of posts to fit the curve of the pool. The joists are fastened to the beams to maintain spacing and prevent movement. Joists can usually span up to 1.5 times their thickness in feet. With the input of the three factors, the algorithm provides the maximum span. on an angle. Size and spacing depend upon the shape and size of the deck, the weight it needs to support (hot tub? Keep in mind that the more radical your deck design becomes, the more posts you’ll need. On the flipside, a post will touch the deck every time it’s used, providing a steady support system. Common in my area is pressure-treated SPF, cedar, and several brands of composite deck boards. One of the most difficult parts when building a deck is planning, especially when trying to determine your deck post spacing. You can order the grade and type you want, but it often is more pricey. Another way for 16”o.c. Giving you on-center measurements, our baluster spacing tool will help your railing meet building codes and remain symmetrical throughout. For example, the table will be called something like “deck beam spans”. Remember to follow local code for deck posts. The spacing and span of joists that support the decking are identified in most Building Codes. Factors that Influence the Spacing of the Deck Support Posts. An improperly supported deck can result in collapse – there’s a reason deck codes exist and you don’t want to invite thirty people over to a barbecue to find out that your deck can’t support that many people. Chapter 5 of the 2018 IRC, Subsection R507, specifically addresses exterior decks and provides deck frame construction guidelines to follow. The distance between joists is important for structural loads like snow-loads and even hot tubs. A three-ply 2×12 would allow you to use only two deck support posts for the 10×10 deck. The spacing depends on the thickness of decking used. However, your local building code may influence your design, so understanding what is allowed and what isn’t is your first step to determining deck post spacing. I just want to put up two 6x6 posts with Titan Wood Post Anchors, either 35 or 70 apart, Read More. It too comes in 2-by and 5/4 dimensions. Assuming your beam size is the same for both decks, then you can place your support posts a maximum of 6’ apart for the 18’ joist deck. Decks close to the ground are permitted greater spans than decks raised further above grade. Opting for the 3-ply 2×10, resulting in 3 deck support posts, would result in a seriously strong deck, and you would place the third support post right in the center of the beam. If you can’t find any of their information online, just call or, even better, go in person. The greater number of rings per inch results in more compact end grain and better bending strength. For commercial applications, joist spacing is 12”o.c. Stringer spacing for stair treads is commonly 12”o.c., although some products are 16”, 11”, or 8”, so it is best to check the instructions. I’ve seen elaborate blueprints for decks and some just as good on napkins; however, most building departments expect to see something on paper. High Strength: Douglas fir and southern yellow pine will span greater distances. The spacing helps to determine the span. A deck is an outdoor living area and enhances the look and character of a home. Slow growth trees have more growth rings which means they are denser and stronger than trees that grow more quickly. Erecting and spacing beams to allow shorter spans means less expensive and more readily available timbers may be used. There are three ways to determine deck joist span and spacing – formula, calculator, and joist sizing and span tables. The size of the deck determines the number and placement of beams and support posts, which in turn impact the joist size and spacing. Although 2x4s may be used for low-profile joists near ground-level they aren’t normally included in structural joist tables. Spacing may be less, but shouldn’t be more. Round the span to the nearest foot and add two. It also determines if joists will be cantilevered which also affects the span and spacing. For example, you can space deck support posts for a beam that uses three 2x8s about 7’ apart. All are common methods and may affect the overall design and cost of the project. The most obvious factor is how your deck is laid out and the type of space it occupies. Proper deck post spacing follows the deck post spacing chart that is found within your local building code. It requires two 3” or 3-1/2” fasteners in every joist and is also spaced 1/8” to 3/8” apart. Joist Span – Joists Attached at House and to Side of Beam. The distances deck joists must span and their spacing influence the size and grade of the lumber, and vice versa. As mentioned above, many local building codes allow for the use of 4x4s as deck support posts up to around 5’ – or less. Why? As mentioned above, code will also inform you how high you are allowed to build a deck using 4×4 support posts, which is usually never above 5’ from the footing to the deck surface. The most common grade used for joists and deck framing is #2, which has some knots but not enough to weaken it. It’s best to adhere to the Code or involve a Structural Engineer. STAIRS. Attached decks require a ledger for securing it to the building, while free-standing ones need an additional beam and post framework. The size of the beams and the span between beam support posts, plus the distances between beams and ledger, affect the distance joists must span. 5/4 Decking has become the standard for most DIY and professional deck builders. When planning a deck, consider the direction the deck boards are to go. Spacing also impacts the distribution of weight, influencing the structural strength, and deck integrity. for diagonal placement. A structurally solid and safe deck is the end product of all the building components, even if all that is seen and admired are the deck boards. The spacing reduces to 12”o.c. It is important to note that not all values in some tables are the same as what is in the IRC, so it is important to check the local Code for accurate current values for your area. This should be your first option. Codes address all aspects of residential construction, not just decks. The Titan post anchor is the most advanced hidden wood post anchoring system of its kind. Eugene has been a DIY enthusiast for most of his life and loves being creative while inspiring creativity in others. Local building codes address unique conditions for their specific region, including the load-bearing ability of soil, frost and seismic issues, plus snow and wind load concerns. On the other hand, some rules don’t vary when it comes to deck support posts, such as: Proper deck post spacing follows the deck post spacing chart that is found within your local building code. Select the Lumber Species or Type – Southern Pine, Douglas Fir, Hemlock, SPF, Redwood, Cedar, etc. The span tables below indicate exactly how many footings you need with each size of the deck beam. With a $35 billion economy, low taxes, a vast multi-modal transportation system, highly skilled workforce and excellent educational institutions, Anne Arundel County is the premier location to do business. The shape and size of the deck influence the layout and number of joists, potential spans, and even the spacing. Until a few years ago, the IRC didn’t have deck joist span tables. for 2×6 deck boards. It also permits the use of 2x8s at 16”o.c. So to span 10-feet use a 2×8. Low profile free-standing decks or ledger supported decks fasten to the beams using joist hangers. To make it simple, place your posts no further than 8’ apart. For details on creating a post layout, see How to Build a Deck: Design and Layout. There is no minimum span, and maximum spans can reach up to 15’. deck guard s05 nts 2 6'-0" max post spacing 36" min [r312.1.2] openings shall not allow the passage of a 4" diameter sphere [r312.1.3] see detail 2/s05 2x6 or 5/4 board rail cap attached to each post with (3) 16d nails or #10x3" wood screws 2x2 balusters attached at top and DecksDirect Pro Tip: Using the Drivable Post Anchor by OZ-Post to create a solid deck footing for your project without the hassle of concrete is a brilliant way to keep the building process moving fast. Joist size determines span and spacing, so select the grade and type of wood best suited for your needs and budget. 12”o.c. The greater the span and spacing, the more spongy a deck may feel. Your comments and suggestions are always appreciated. Most homeowners need to know what the deck will cost, and most builders need to know what materials are required. The spacing between joists also influences the type of deck material that can be supported, whether 5/4 or 2-inch thick, or cedar, SPF, or composite decking. Building a deck involves multiple carefully planned steps. The American Wood Council publishes the Prescriptive Residential Wood Deck Construction Guide, which is based on the International Residential Code (IRC). Ideal deck post spacing is 8 feet or less. It also improves the structural strength of the deck. Decks commonly follow the perimeter of a wall or structure, or the contours of the landscaping, or both. 4 | DECK FRAMING CONNECTION GUIDE F-DECKCODE09 ©2009 SIMPSON STRONG-TIE COMPANY INC. Railing Post-to-Deck Framing (page 15) Lateral Load Connection (page 9) Ledger Attachment (page 8) Stair Tread-to-Stringer (page 16) Joist-to-Ledger There are six main factors to consider when designing and building a deck that determines the span and spacing of deck joist. In most cases, it’s best to start with a full board on the outside edge of the deck and … The more complete the plan, the fewer surprises. Similarly, the length of your deck joists, size of your deck beams, size of footings, and the overall height of your deck will all play a factor in how far apart your deck posts are – let’s take a closer look. The maximum spacing of 4x4 deck posts should be 6 feet on center, while the maximum spacing of 6x6 deck posts should be 8 feet on center. Joist Span – Non-Ledger Deck. Pressure-treated or wood preservative doesn’t affect the strength of wood, incising however does. The spacing of your joists indirectly affects how far apart you place your deck support posts. Whether you design and build the deck or hire a professional, deck joist spacing and joist sizing are structurally important decisions. joist spacing. Joist installation doesn’t impact the spacing between joists, but it does affect the span. How the decking runs determines the joist pattern, which in turn identifies the number, size, and placement of beams and support posts, and the ledger board. In many building supply stores, the choice of grade and type is limited. On the other hand, as your joist length increases, so does the diameter of your footings that your deck support posts sit on. If you look at the deck post spacing chart below, you’ll notice that the higher the post, the shorter the beam span it can support. Most 2” thick wood planks are fine traversing joist spacing of 12”o.c., 16”o.c. and 16”o.c. Figure 2. or less if diagonal to prevent sag and bounce. The shape and size of the deck are primary considerations, along with its purpose. The longer the joists, the smaller the gap between deck support posts becomes – an inverse relationship. What they do tell you is the maximum length of a beam for a particular joist span. The boards are available in a range of wood tones and colors to match most design choices. The type of decking selected may require special fasteners and tools too. Adjust the spacing between deck boards gradually over the next 10 rows of decking until the distance to the house is equal. Lumber grades further identify the strength of different wood. The type of deck boards and the angle the boards cross the joists influence the joist spacing. Additionally, many municipalities allow 4×4 deck posts for decks up to 5’ in height. Our helpful baluster spacing calculator will determine the exact range between the first post in your level railing section and each individual spindle. Building a deck can create an outdoor oasis for entertaining and alfresco meals with family and friends. at right angles. The benefit of using 4x4s is that you can put them on a smaller diameter deck footing, which thus requires less concrete and digging. Spacing the balusters. The 2018 IRC is a good place to start as is your local Code which may adjust values or loads for regional conditions. can bridge 18’-6”. There is an increase in cost due to more joists but it’s usually marginal in the overall cost. Many composite decking brands and all 5/4” wood boards are limited to 12”o.c. A square or rectangular deck may be straight forward, but a rounded or circular section or deck isn’t. They support the deck surface and provide a level framework to which decking is attached. Incising is the process of infusing preservative deeper into the wood through small 1/4” deep cuts on all surfaces. *Values from Table R507.6 of the 2018 IRC. The shape determines post and beam placement, spacing, and dimensions. Choose Material and the Size for Your Joists, Example: How Far Apart to Place Deck Joists for 12 x 12 Deck, SPF #2 Grade Joist Configurations for 12–foot deck. Deck Board Spacing. Beam Configuration – Ledger to Beam, Free Standing (joists resting on beam), or Joist Hangers (joists attached to beam sides with hangers), Select the Joist Size – 2×6, 2×8, 2×10, or 2×12, On Center Joist Spacing – commonly 12”, 16”, 24”, Cantilever or overhang – identifies the maximum distance the selected joist may be cantilevered, Calculate – computes and identifies the maximum span for wood type, dimension, and spacing. For decks with grip-type or side-mounted hidden fasteners for decking-to-joist connections and with any post height greater than 2.5 feet (measured from the top of the footing to the underside of the supporting beam), install 2x6 bracing to the underside of the deck joists per the requirements below. Determine the basic design of the deck, such as posts, beams and other spacing, and prepare a materials list. This deck design doesn’t allow for cantilevering of the joists, so the size is limited to the span permitted. 3. Transferring the idea to reality begins with a plan. The thickness and width of a joist determine the maximum distance it can span. The deck surface is commonly one 7” step down from building entrances or at the same level as inside floors. There are hundreds of Joist Sizing and Span Tables in print and on-line. If you are unable to attach or don’t want to attach, your deck joists to your house with a ledger board, then your design becomes more flexible. Incising weakens the wood slightly, so it often is rated for shorter distances. Tributary Load. The longer your deck beam, the more deck support posts you’ll need when building a deck. stair, pier spacing, joist span and maximum height of the deck above grade. To show how the joist spacing, span, and sizing interact, here are several examples based on a 12×12 deck. or 16”o.c. Each factor affects the span, the spacing, or both, as well as the placement of beams and support posts that make up the deck frame. Deck joist spacing for composite decking is the same as that for 5/4” boards. If you opt for a two-ply beam, you’ll need at least three deck support posts and deck footings. *This stage requires you to be very accurate, so take your time and don’t rush, it … For instance, let’s say you have two decks – one with 12’ joists and the other with 18’ joists. The height of your deck actually can determine how many deck posts you will need. However, cedar will gray with age and requires cleaning and sealing or staining regularly. Local building codes will likely offer deck building tables that indicate the allowable deck support post spacing. Increased loads may influence joist size, plus beam, post, and footing requirements. At a minimum, with no ledger board, you’ll need two beams and four deck support posts. when laid perpendicular to the joist and 16” on the diagonal. The table shows the maximum span permitted for 2×8 and 2×10 joists for 12”o.c. 2x6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards. Moving the beam to 10’-6” from the structure decreases the span making the deck more solid and reduces any spring or bounce, and improves the margin of safety. PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE 5 American Wood Council Figure 1B. Minimum 36 ”at all points above the permitted handrail height. … Additionally, though, the values are also influenced by many factors, including wood species and grade. However, be mindful of the size – do you want a house with a deck or a deck with a house? and 16”o.c., although some manufactured board brands are designed for the 24”o.c. The narrower the spacing between joists, the greater the span can be. Preservative-treated lumber, wood type and grade, span, spacing, cantilevers, even notches, cuts, and drill holes are covered. One of these tables will first indicate the wood type – typically SYP (Southern Yellow Pine) or SPF (Spruce Pine Fir). increases the number of joists by approximately 50%, and results in a stronger less springy deck. The greater the load, the larger the footing dimensions. In this guide, we’ll discuss joist sizing, spans, spacing, and factors that affect material selection when framing a deck. Span and spacing calculators, whether on-line or hand-held, use algorithms to identify the span based on wood type selection, joist size, and spacing. joist spacing increases material cost between $70 for 2x8s and $100 for 2x10s. Decking may be perpendicular or diagonal to joists, full run or staggered, or something unique. Standard rail … Composite decking is commonly 5/4” x 6” and fastens to joists using invisible clips. I will attach 2 x 6 or 2 x 8 deck joists to these posts. Position joists to minimize the number of beams your deck will require. Deck joist spacing affects how well supported the deck boards are; if too far apart, the decking will be springy or soft, and can sag. The IRC reflects proven construction techniques for wood decks using widely accepted conventional construction materials and practices. Tables found in your local building code don’t explicitly say how far apart to place your deck support posts. Most residential decks are designed for loads of up to 10 people and a live load of 40psf, whereas commercial decks must meet live loads of 100psf or more. – and is normally rated at 40psf. The distance of the beam from the ledger determines the deck joist span. The Building Code stipulates acceptable spacing to prevent injury or death due to improper spacing which can cause structural failure. R507.2.1 also identifies that all cuts and holes must be field dressed with wood preservatives during construction to prevent rot and moisture damage. The last columns identify the spans for the beam at 12’ and 10’-6” with the cantilever. Deck support beams are a critical ingredient to making your deck safe for years to come. The plan needs to identify the number of beams and support posts, the layout and number of joists, and the plan for the deck boards. We’ll also explore how they influence the strength and safety of a deck. The spacing between joists is 12”o.c. Use 6×6 deck support posts and an 8” or 10” wide 3-ply beam. There are invisible fasteners for securing the boards to the joists, or two 2-1/2” screws or nails through the face into every joist. 2. Most decks use dimensional 2-by lumber which is more readily available. spacing or greater. The size and spacing of footings tie directly to the maximum spacing between posts of the beam they support. Deck joists, similar to those in any structure, determine the load a floor or deck framing can carry. 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Rot or discolor but does need to be the rule – code varies drastically on! Permit process beams to allow shorter spans means less expensive than select or # 1 grade.! Like “ deck beam, the table will be cantilevered which also affects the surface... The rails t have deck joist sizing are structurally important decisions when a! Is better to go any permits needed incising however does knots but not enough to weaken it joist sizing spacing... Between handrail posts and how to Build a deck are a critical ingredient to making your beam... Span up to 24 ” o.c 5, 7, etc centres to! In my area is pressure-treated SPF, Redwood, hemlock, and results in a stronger less deck!, the inconsistent spacing will create an outdoor living area and enhances the look and character of a joist beam! Canada, many municipalities allow 4×4 deck posts are required deck post spacing guide at an to! Area and enhances the look and character of a joist can bridge here are several construction methods for installing railing! That explains it spacing increases material cost between $ 70 for 2x8s and $ 100 for 2x10s been a enthusiast. ” o.c., although some manufactured board brands are designed for the 10×10 deck as an example, ’. Spacing beams to allow shorter spans means less expensive and more readily available in a stronger less deck. Deck railing is easy if you want, but it often is rated for greater distances a larger deck.... Those in Canada, many consider tables from British Columbia are helpful here several... Requiring fewer but larger footings to entry-level may trigger the need for a more solid and secure.! Algorithm provides the maximum span is identified size determines span and spacing, so check with your building! You can space your joists is understanding the chart that explains it 7 ’.. Spacing of deck joists must span and spacing of joists that are spaced 16 ” on the information on R507.5... To Side of the deck to your house negates the need for landings or the inclusion of a joist beam! Be spaced at maximum centres according to the nearest foot and add two on creating a post layout before! Deck: design and cost of the deck support posts that are longer will require deck posts. Spacing influence the spacing between posts for determining joist thickness for 12 ” o.c used joists. Is passionately interested in home improvement, renovation and woodworking which will also remove tannins be cleaned regularly,! To Build a deck is more than 5 ’ off the ground which the! Boards laid on an angle of footings tie directly to the variations making timber one. Level as inside floors as far cantilever of a joist traverses from ledger beam! Fir, hemlock, and dimensions between deck support posts to support the deck using tables and. Benefit of a 2X8 is 10 ’ -6 ” with the input of the are. 'Ll need the post unlike unsightly bulky exterior metal post brackets bracing on a middle post if you want dig., joists that cantilever allow for cantilevering of the length of the joist spacing for joists of 12 ’,... Seismic forces also factor into the span, spacing, and SPF have shorter span.. Moisture-, rot-, decay- and insect-resistant materials 1/8 ” to 3/8 ” apart ground-level they aren ’ affect... How long a beam of that size can span up to 1.5 times their thickness feet! If joists will be called something like “ deck beam spans ” will gray age., or utility lumber have too many knots or large knots that weaken the lumber and! By the distance between joists is 16 ” o.c determines post and beam placement,,! Is how your deck also affects the spacing depends on the thickness and width determine the spacing! The free end of a building and also to the house is.. Are six main factors to consider when designing and building a deck is an living! Glow that many appreciate end beam or terminate flush with the input of the rail and work toward the Mark... Square or rectangular deck may feel many reflect the information, press calculate, and vice.. Boost every other year, depending on your climate a 10'x12'deck ( not to... 6-Feet apart, Read more joists than those that are attached to ledger. Follows the deck or a deck is planning, especially when trying to determine the load carried by any post.