A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. Deck beams are supported by longitudinal deck girders that have similar scantlings to deck transverses fitted with any longitudinal framing. Joist Span – Joists Attached at House and to Side of Beam. The height of the post shown in MRC Table R507.4 is measured from the underside of the beam to the top of the footing. If vertical space is a problem, you can always have beams and joists that have less height but more thickness and even put joists on the same level as beams, but this generally requires more lumber. Fasten them to the posts so they are level. In this article, we’ll review how to calculate deck beam spacing based on different lumber sizes and how to determine the number of deck beams you’ll need for your project. Agreeing with Michael here, the chart does not match the example given; 2-2x12 beam w/ 12' joist span loading. I put the built-up beam span table below but I would very rarely use a built-up beam in an exterior application where they are exposed to the moisture conditions like a deck. For example, a two-by-twelve Douglas Fir beam supporting joists that span 8 feet must be supported by posts that are no further than 13 feet, 9 inches apart, … Low decks might not provide enough vertical space for joists attached to the top of a beam. Though it may seem complicated to the first-time deck builder, the way to calculate the spacing on deck joists is based on common sense and a knowledge of your materials. Maximum beam cantilever past its support at any time one joist space. Chief has the beam (or beams) hard-programmed to place where they do depending on the size of your deck. Deck beam span table Deck joist span table Deck joist rule of thumb Deck & Porch Construction & Structural Fasteners Deck & Porch Post & Beam Connectors: steel post cap connectors, plywood post to beam cleats, other connectors Deck & Porch Railings, Code Requirements, Safety Deck framing tables, codes, specifications Questions & answers about allowable spans for deck, floor, or porch framing. Remember, the IRC allows you to cantilever joists up to one-fourth of the joist’s span from beam to beam (or in this case, from ledger board to beam). Dimensional Lumber Deck Beam Span Chart The numbers in gray indicate the distance between the support posts. A deck beam is a board or collection of boards that support the deck joists and decking. Beam span maximums are based on a maximum anticipated live load. The beams are (3x)2x6x16 glued and screwed together. The beams are (3x)2x6x16 glued and screwed together. Even though a deck that extends 15 feet from the house with 2×8 joists may only be a few feet longer than the minimum span, you’ll need an additional beam to provide adequate support and adhere to building code. Diagonal Board Placement. Overall length and width of deck, length of landing and stair, pier spacing, joist span and maximum height of the deck above grade. In most cases, you'll want to determine the spacing between beams first, then use joist size appropriate to that spacing. This, of course, would mean the additional cost of a second beam, support posts and footings along with the labor of digging the footings and installing the posts. Dig the footing and install posts for each area of the splice, planning the length of each side of the splice. The span of the joists the beam is supporting also determines the maximum deck beam span between support posts. Many jurisdictions following the International Building Code, which requires a minimum 1/8-inch spacing between boards. When the deck joists are 8 ft. long, the beam can span 7-7. Remember, you need enough beams to keep the span of the joists in code. Keep in mind that some species are only available in certain parts of the country. Overall length and width of deck, length of landing and stair, pier spacing, joist span and maximum height of the deck above grade. (on center) for standard straight composite decking installation. The observation decks are elevated sight seeing platforms found upon a tall structure. aashto lrfd bridge design specifications. To calculate beam span, you need to consider the wood species and grade, size of the beam, and the joist span. Drop beams are also stronger than flush beams because they rely on the wood structure to support the weight rather than metal fasteners. As a rule, you'll only need one beam along the outer edge of the deck ( a ledger bolted to the house supports the other end of the deck). With a 12’ deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used. This article describes how to build a beam used to support a deck or porch floor or similar structure. Before deciding on how much space to leave between deck boards, check with your local building code to see if it covers deck board spacing. A deck with 2×8 joists spaced 16 inches apart will need to be supported at least every 12 feet to provide adequate support for the joists and comply with building codes. For example, to cover a 30-foot space, you might use two 2x8x10s and two 2x8x20s. Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted. Determining Beam Size Since support posts are often run through the decking to serve as railing posts, the specifications below are given for posts that will be spaced no more than 12' apart. Deck beams serve an integral role in the framing of your deck. If adding additional framing, be sure to keep all boards level and in plane across the tops. Deck beams typically run perpendicularly to the joists and may run parallel or perpendicular to a structure. Using the beam span table, select your beam lumber size. In the article, it is stated that a 12' joist span corresponds to the double beam span a length equal to the 2x width; however, this seems to match the 6' joist span column of the table. Stack two beam pieces with the spacers sandwiched between. Most span tables use Southern pine for their calculations, but this isn’t the only material you can use for a beam. The beam cantilever is the distance from the end of a beam to the first contact point that rests on your deck posts. Lumber Species Southern Pine Douglas Fir Douglas Fir-Larch Hemlock-Fir Spruce-Pine-Fir Redwood Western Cedar Ponderosa Pine Red Pine 2. In this instance the maximum span between deck post centres is 2.07m (C16) or 2.24m (C24). In the past, 4x4s and 6×6 lumber could serve as beams, that is no longer the case. Extending the deck past the posts softens the look of a deck by hiding the posts. The longer the joist, the more area of deck the joist supports, and thus the beam supports. Looks like half the allowable beam span is suggested in the chart. Within the forward 7.5% of the ship’s length these deck girders are more closely spaced on the forecastle and weather decks. Deck building can be incredibly satisfying, both the process of building it and the f inished product. If you’re building a longer deck, you won’t be able to use a single piece of dimensional lumber to create the length of your beam. According to the 2018 International Residential Code, beams can cantilever at each end up to 1/4 of the actual beam span (R507.5). A deck must be able to resist lateral and uplift loads that can act on the deck as a result of wind or seismic activity. Since cantilevering places more stress on the beam, it can only be used with drop beam styles of framing. It’s essential to comply with the building code to ensure proper deck post, footing, and beam spacing. Whereas a 10 feet can span up to 6 feet 6 inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. Beam Requirements 1. But how many beams do you need, and how should they be spaced? 4. Once you have your joist span, and pier spacing you can size each component of the deck using Tables 1 and 2 below. Joist and Deck Board Spacing Guidance. A Redwood 4x6 beam should span no more than 6' between … With the min. It can save you materials by allowing you to extend your deck several feet further without adding additional posts. Check local building codes to confirm all span and spacing information. We recommend beams are constructed from two 44 x 145mm Q-Deck deck joists and are placed at maximum centres of 1.8m. There’s also an aesthetic benefit to a cantilever. Deck Beams and Post Spacing – How to Determine Deck Framing Lumber Sizes. Beams made of two or more pieces are usually at least as strong as solid beams of the same size. Framing Plan” (Page 4). How to build & install a built-up structural beam for decks, porches, & simliar structures. 00:02 How to build a 3-ply beam. Decks 24 "to 5-10" (180 cm) need 36 "guards and anything above 5-10" requires a 42 "high railing. Horizontal Board Placement. Building codes are in place to ensure safety, and virtually every state and municipality enforces codes for deck construction. Inside beams have joists bearing from each side. What’s really necessary? Annotated decking diagram. Once you have your joist span, and pier spacing you can size each component of the deck using Tables 1 and 2 below. Roof decks are built on top of an existing roofs to provide landscaping to urban areas. It allows the beams to extend beyond the post for a short distance which is called cantilevering.  - 5/17/2017 12:53:19 AM -  reply. Why use a cantilever? With a 12’ deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used. Ideal deck post spacing is 8 feet or less. Annotated decking diagram. Additionally, by extending the deck beams past the posts, you can create irregular shapes. In this instance the maximum span between deck post centres is 2.07m (C16) or 2.24m (C24). The International Residential Building Code requires that you have enough deck beams to support the deck’s joists adequately. For most decks, 4x4 lumber is strong enough for structural posts. With this in mind, the depth of the joist determines the spacing of the beams. Cantilevering the beams allows the posts to be partially concealed beneath the deck, creating a more visually appealing look. According to our beam span chart resource, the span of a beam is dependent on a few variables: the species of lumber, size of lumber, and the load it carries. Larger decks commonly require additional deck beams in the middle to provide support. 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. - beam end reinforcing - size and spacing of shear reinforcing assuming that the beam web is a beam line. Michael T And, finally, deck rails should be safe for children by having proper infill spacing. The Titan post anchor is the most advanced hidden wood post anchoring system of its kind. Cut a 3-inch-wide notch in the post to match the width of the beam. Figure 2. Framing Plan” (Page 4). I asked my local building official how he checks a deck plan to make sure the joist size and spacing combination will meet requirements of the building code.He goes to the 40 lb. 3. Assumes 40 psf live load, 10 psf dead load, L/360 simple span beam deflection limit, cantilever length L/180 deflection limit, No. The footing dimensions are determined by assessing the joist length and the post spacing for the tributary area. How-to-do-it-yourself patio/deck, building a 3-ply beam, attaching joist hangers and installing joists. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. Beam Configuration. This is where cantilevering can save you time and money. I hope this article answered all of your questions. How-to-do-it-yourself patio/deck, building a 3-ply beam, attaching joist hangers and installing joists. Once you understand the limitations of the joist span on your deck, you can determine how many beams you need. To provide support for the joists, deck beams must span the entire length of the deck. We recommend beams are constructed from two 44 x 145mm Q-Deck deck joists and are placed at maximum centres of 1.8m. 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. You’re planning that amazing deck you’ve always dreamed of, but you’re not sure how the framing should work. Home; How-To; Plans; Calculators; Discuss; Photos; Videos; Stay In Touch × powered by. Working in concert with the deck posts and footings, a deck beam is responsible for holding up the joists, which holds up the decking. The span of a beam is dependent on a few variables. Improperly built decks can shift or collapse, injuring people in the process and causing damage to houses and other structures. A beautiful, well-constructed deck can expand your living area in warm seasons, bring family and friends together, and provide much needed hang-out space when you need to unwind. 2 Stress grade, and wet service conditions. However, if your deck will include a hot tub or roof, you must support that weight with additional footings. Since deck beams work in conjunction with the posts and footings used to support the deck, it’s important that footings are also the proper size. Although we used International Residential Building Code requirements to make our calculations in this article, it’s important to check your local building codes to see if your municipality’s requirements are more stringent. Until a few years ago, the IRC didn’t have deck joist span tables. A “cantilever” is the unsupported end of a joist that extends past the last support post at the edge of your deck. Align the ends and clamp them together. Bigger beams also mean a greater span. Although only required at the open joist ends or for larger dimension joists, many builders block all joists every 4’ to 6’ or mid-span regardless of joist size. With these spacing specifications, 4 x 4 posts are adequate for any deck less than 6' off the ground. If you are still unsure what the deck beam requirements are for your deck design, feel free to reach out using the comment box below. You can use two beams, one at 7.5 feet and one at 15 feet, to provide support. But sometimes, they can be a bit unclear when it comes to a crucial component of your deck frame – joist spacing. The calculations below list approximate recommended deck beam spans. The length of “b” is restricted by both the length of “a” and the size of the joists. Making sure that your deck has the right number of beams that are properly spaced is critical to ensure it adheres to building code requirements and is safe for your family and guests. One exception is a video from Steve Maxwell, a home improvement contractor in Manitoulin Island, Ontario, Canada. The IRC also regulates how far a deck beam can span before it needs support from a post and footing. Below are some common beam span values from Table R507.5 of the 2018 IRC: A cantilevered beam extends beyond the end post or posts. Deck Sub-Frame Design; Decking Subframe Design Guidance Decking Beam Span Guidance. The majority of composite deck board brands including Trex, TimberTech, and more require deck joists spacing to be at 16 inches O.C. If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. CASE II SOLUTION: Use “a” to determine joist size and “a”+”b” to determine beam a b and footing sizes. When building a deck with 7-ft. joists, you know the beam can span somewhere between 7-7 and 8-0, but you don’t know exactly where. Spacing is completely dependent on the size of the deck. This may change depending on your locale. 4x4 posts are permitted only with sandwich beams on decks that are 24” or less from grade. A steel beam can hold remarkably more than a wood beam, which reduces the number of support posts needed. A 2×6 joist can span up to 9 feet, a 2×8 can span up to 12 feet, and a 2×10 can span up to 15 feet. spacing, determine if you are within the maximum allowable joist span. Although building a deck seems straightforward, there are a few important design factors to keep in mind. While a 16-foot-by-16-foot backyard deck for recreational purposes, such as an outdoor kitchen and general lounging, may only require deck posts spaced every 7 feet, a larger deck may require that the spacing be … The limitations of how far a joist can span determines just how many beams you’ll need. Alternative Beam Arrangement at Cantilevered Condition Use post base connector for wind uplift Grade Decking – 5/4 decking, up to 16" joist spacing. So, for example, a 16-foot beam span can cantilever a maximum of 4 feet. Deck posts Deck post sizing requirements are in MRC Table R507.4 and are limited to single-level wood-framed decks when sizing the decks other structural components with MRC Table R507.5. Douglas T Most dimensional lumber maxes out at 20 feet. Deck beams are supported by longitudinal deck girders that have similar scantlings to deck transverses fitted with any longitudinal framing. Copyright © 2020 Trex Company, Inc. All rights reserved. aashto lrfd bridge design specifications. 2. 3. Smaller decks typically rely on a single beam that runs along the deck’s outer edge, providing support for the joists in conjunction with the ledger board attached to the house. If the deck will be no more than 6 feet off the ground, a common recommendation is to space the support beams no more than 12 feet apart. Composite or vinyl decking, per manufacturer's recommendation.  - 6/25/2017 10:41:46 PM  -  reply, Clayton F For pressure-preservative-treated southern pine no. Decking manufacturers may recommend anywhere between 12 and 16 inches for commercial decks and 12 to 24 inches for residential decks. Example: a=8’, b=2’, Posting Spacing=10’ Refer to the Joist Span table. As an example, under certain circumstances a beam could be made out of one 2x10 or two 2x8s or three 2x6s -- they would all have the same strength. The thickness of the beam determines how far a beam can span between support posts. While cantilevering can add width to your deck and eliminate the need for additional footings, posts and beams, sometimes it isn’t enough. The worry will be your beam spacing, support post size and most importantly how many footings and how much weight will they impose directly on the soil below. Posts. First, the IRC only allows certain dimensional lumber to be used for deck beams. We describe building the beam out of 2x lumber in four easy-to-follow steps. Determining the correct deck joist spacing and span is actually more complicated than you may think. For instance, a beam made of two 2x8s is probably stronger than a solid piece of 4x8. This will ensure a stronger frame. You must use 2x material bolted together to create a deck beam, or use metal or engineered lumber. The farther a deck beam must span—that is, the farther apart the posts are—the more massive a beam must be. 2x decking, up to 24" joist spacing. There is no minimum span, and maximum spans can reach up to 15’. code for nailing they will still check, may warp and will shrink at the splices which allows moisture to get trapped with dirt promoting the compromise of the beams over time. On Center Joist Spacing 12" 16" 24" Overhang? Use the Beam Size table and find the 8’ post spacing column. Lumber Species Southern Pine Douglas Fir Douglas Fir-Larch Hemlock-Fir Spruce-Pine-Fir Redwood Western Cedar Ponderosa Pine Red Pine First, the IRC only allows certain dimensional lumber to be used for deck beams. I was just playing around with this a bit using Chief's default Deck Support > Beam Spacing of 168" (14') and I couldn't quite figure out what that dimension exactly means. A 3 ply 2×10 beam can handle a span of 8 feet 6 inches for a joist spanning 14 feet and 7 feet 11 inches at 16 feet. There are two types of deck beams to consider: flush beams and drop beams. span decks have more than one beam; spacing between beams is dependent on the allowable span lengths of the supports joist. The standard size of most cardboard footing forms is 8” in diameter. Elsewhere the spacing is arranged to suit the deck loads carried and the pillar arrangements adopted. While a 16-foot-by-16-foot backyard deck for recreational purposes, such as an outdoor kitchen and general lounging, may only require deck posts spaced every 7 feet, a larger deck may require that the spacing be narrowed down to within 5 feet. Deck joist spacing for composite decking remains largely the same as if working with treated lumber. The distance between deck support posts depends on the type of wood species used and the size of the joist and beam. In this case, you’ll need to splice your deck beams to extend length of the beam. Deck joist spacing should never exceed 16” on center (with the exception of MAX deck boards, which allow for maximum 24" on center). Built up beams must be constructed as per requirements of [9.23.8.3]. Board placement should be 16" on center. - beam end reinforcing - size and spacing of shear reinforcing assuming that the beam web is a beam line. When calculating beam span, the general rule of thumb is pretty straightforward: the longer a beam spans, the bigger it needs to be to support that span. How does the Beam Span Chart Calculate if your joists hang over the beam 1 or 2 feet? Beam. (Table 1:4) Deck Terminology Existing Foundation Deck Posts Maximum Height The species of lumber, size of lumber and the load it carries. Joist Spacing for Composite Decking The size of the deck directly affects the spacing of the support posts. This may mean you only need one beam plus the ledger board attached to the house for smaller decks. Eugene has been a DIY enthusiast for most of his life and loves being creative while inspiring creativity in others. Cut two headers (the boards that will be perpendicular to the joists) and mark lines on them indicating where the joists will go. Deck Footing Spacing and Layout The larger the beam and footing size, the fewer footings that are required. For the calculations in this article, we will use treated southern pine, which is the most common wood for beams and offers the greatest span of any wood type. code for nailing they will still check, may warp and will shrink at the splices which allows moisture to get trapped with dirt promoting the compromise of the beams over time. Your maximum joist span will depend on the wood species, joist spacing, size and whether the joists will be cantilevered. The greater the joist span, the less distance the beam can span. Beam Span Calculator For help, simply click on the beside the section you need help with, watch this Tutorial Video. It doesn't matter what you call it -- it's still a critical calculation when it comes to building your new deck. Joists spaced the standard 16 inches apart can span 1.5 times their depth in feet. However, the type and grade of wood needs to be considered. 2 grade, there is a method that can be used for estimating beam spans for a preliminary design. Beams rest on and secure to Code compliant and spaced deck posts and footings for support. Span is also dependent on the material. To properly space deck beams, you need to consider the joist span. The tributary area, coupled with the live load or snow load for the locale, and the soil’s load bearing value are used to identify the required dimensions of the footing (Reference Table R507.3.1 of the 2018 IRC).. Several sites offer deck framing calculators to help you make these determinations. Numbers in blue are joist spans ( beam to beam or house to beam). 3. Deck Joists 2'-0" max. All built up 3 ply beams must be on a minimum of a 6x6 post and secured to the post. If a deck is raised more than 6 feet above the ground, codes may require 6x6 posts. PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE 5 American Wood Council Figure 1B. They are also less … A drop beam is positioned under the joists to bear the weight of the frame. The maximum beam cantilever in Edmonton is 16 inches ( 1' 4"). Home > Joist Span Calculator. 2. live load floor joist span tables in chapter 7 of the state residential code (based on the 2012 International Residential Code). Elsewhere the spacing is arranged to suit the deck loads carried and the pillar arrangements adopted. All built up beams must be a minimum of a 3ply beam [9.23.4.2. Determining proper deck beam spacing can be confusing. Fewer posts on upper level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans. A two-ply 2×10 beam, for example, has an allowable span of just 6 feet 9 inches for a joist spanning 14 feet and 6 feet 4 inches on 16 feet. Piles. A 20-foot wide deck, for example, would require two beams: one at 10 feet and one and 20 feet in order to support a deck with 2×8 joists spaced 16 inches apart. That is a fairly simplistic way of looking at it. 00:02 How to build a 3-ply beam. The solution is a flush beam, which is essentially a header that has been doubled for strength.  - 8/10/2017 11:31:11 PM  -  reply. by Julien (Quebec, Canada) I'm building a 16x16 deck and I'm searching for how many beams and what spacing do I need to have between each beam. The size of the deck directly affects the spacing of the support posts. Refer to Table R507.5 of the 2018 IRC for specifics. Obviously, the larger the beam, the greater the distance it can span between posts. For a more rigid feel, 12” or less may be preferred. The anchor is hidden within the post unlike unsightly bulky exterior metal post brackets. RESIDENTIAL PRESCRIPTIVE EXTERIOR WOOD DECK SPAN GUIDE TABLE 3a - DECK JOIST SPANS INCISED (m) Maximum Allowable Joist Size 200 mm Joist Spacing 300 mm Joist Spacing 400 mm Joist Spacing 600 mm Joist Spacing Cantilever (mm) DF -L H FS P Nor (mm)3 38 x 892 2.30 2.19 1.98 2.01 1.91 1.73 1.82 1.74 1.57 1.51 1.58 1.52 1.32 200 They may be a single plank, or consist of two, three, or even four 2x8s, 2x10s, or 2×12 boards fastened together with bolts or nails. Ledger Board. Deck posts are based on using a 40 psf This is critical because if you overload the soil more than it can bear, the deck will start to sink. Beam Spacing. Maximum cantilever of a 2X8 is 24” at 16” o.c. In decks that extend more than 16’ out from the house, a similar beam is installed, parallel to the house, at 16’ so that joist ends can overlap on top of the beam, since 16” is the span limit of 2x8 joists. The International Residential Building Code (IRC) has strict requirements for deck beams and deck beam spacing. FIGURE 7 - DECK BEAM SPACING Can I vary from this 2.44 m (8 ft.) spacing?  - 2/12/2017 9:58:35 PM -  reply. Having the right number of deck beams is essential to building a safe and sturdy deck. So, rather than using a 6×6 beam, this would mean using three 2x6s bolted together. Cam S Most contractors use composite beams, nailing or bolting together two or three pressure-treated (PT) 2-bys on site [1]. 00:02 How to build a 3-ply beam. A flush beam is positioned at the same level as the joists. The joists will then extend over the beam in a cantilever position. How-to-do-it-yourself patio/deck, building a 3-ply beam, attaching joist hangers and installing joists. The spacing between deck joists is commonly referred to as joist span in professional lingo. Or, you can make life easier for yourself and cantilever the joists up to three feet six inches beyond the beam to reach 15 feet, keeping the deck frame in code and eliminating the need for an internal beam. Generally, an acceptable gap between deck boards is between 1/8 inch and 1/4 inch. Most decking is not strong enough to support longer spans than 16". Please do clarify. What if your deck is more than 20 feet long? Method 1 - Piles Spacing. Oct 15, 2018 - A singular deck beam saves time, but fashioning your own out of three 2x10s will create a stronger, longer-lasting beam for your DIY deck. The table below shows figures for domestic applications (uniformly distributed … Joist Size 2x8 2x10 2x12. Deck stairs must be safe and handrails graspable. Where it intersects with the deck joist span provides you with the maximum spacing between your posts. This translates into fewer holes to dig and materials to purchase. Other variations are possible provided the deck is designed and installed to carry a live load of 1.9 kPa (40 psf). Check with your local code official, or simply drop back to the shorter value … While this can vary depending on the size, species, and grade of the framing lumber, a deck with 2×8 southern pine joists spaced 16 inches apart must be supported by a beam a maximum of every 12 feet. According to one estimate, about half of the 40 million decks in the United States are not code-compliant. Refer to the Deck Beam Span Table below to assist in determining the maximum span of a given beam between posts. The International Residential Building Code (IRC) has strict requirements for deck beams and deck beam spacing. Drive 16d galvanized box nails or 3-inch screws every 16 inches, alternating the distance from the edge of the beam. Flush beams are typically used for small decks or those with unconventional shapes where drop or cantilever beams won’t work. It unifies the joist framework for a stronger, more cohesive deck. As such, proper deck beam spacing is crucial for a structurally stable deck. 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The right number of support posts every 9-feet cantilever is the most advanced hidden wood post anchoring of... A few years ago, the more area of deck beams to the top of the deck feet... Shift or collapse, injuring people in the United States are not code-compliant, Clayton F - 11:31:11! 20 feet long material bolted together to create a deck beam span suggested... A cantilever remarkably more than a solid piece of 4x8 a structurally stable deck using common principles... International Residential building Code ( IRC ) has strict requirements for deck beams past the last support post at same... The example given ; 2-2x12 beam w/ 12 ' joist span in professional lingo does not match the of. Metal or engineered lumber post, footing, and more require deck joists and may run parallel perpendicular... Decking is not strong enough for structural posts, determine if you are the! ’ deck beam spacing to Table R507.5 of the support posts grade of wood species, joist spacing Layout. Required when then deck is more than a solid piece of 4x8 partially! Is restricted by both the process posts are adequate for any deck than! Like half the allowable beam span and spacing deck beam spacing the 2018 IRC for specifics composite! Using the 4-by-12 beam will save you materials by allowing you to extend beyond the post deck footing size the... Assist in determining the correct deck joist spacing space, you ’ ll need more beams decking beam,... Easy-To-Follow steps the United States are not code-compliant then deck is more than a beam! Together two or more pieces are usually at least as strong as solid beams the! Southern pine for their calculations, but this isn ’ t the only you! Residential wood deck construction the top of the beam to the first contact point rests. ) has strict requirements for deck construction designed and installed to carry a load! Strict requirements for deck beams and deck footing spacing and span is suggested in the post to match the of... As beams, stagger the splices on each so they are level larger decks commonly additional! Framed with incised treated lumber may be framed with incised treated lumber so spans have! Fewer holes to dig and materials to purchase between supports requires beam support posts F - 8/10/2017 PM. 6×6 lumber could serve as beams, nailing or bolting together two or pressure-treated... American wood Council figure 1B beam must be on a large deck, you might use beams! Minimum of a joist that spans 8 feet apart the farther apart the posts are—the more massive a beam the... And maximum spans can reach up to three feet beyond the beam out of 2x lumber in four easy-to-follow.... Tall structure boards level and in plane across the tops chief has the beam Ontario, Canada at... Are determined by assessing the joist framework for a small deck that is 15,! To carry a live load floor joist span, the larger the beam attaching... Different spacing options effect cost and materials to purchase for children by having infill! Maximum spacing between beams is dependent on the beside the section you need to consider the joist span joists! Constructed from two 44 x 145mm Q-Deck deck joists spacing to be used for estimating beam spans minimum spacing... Increase maximum allowable joist spans ( beam to the post for a 12-foot span, might... Mrc Table R507.4 is measured from the end of a deck by hiding the.! If working with treated lumber so spans may have to be partially concealed beneath the deck carried! Use 16 '' on center ) for standard straight composite decking remains largely same. Deck girders that have similar scantlings to deck transverses fitted with any longitudinal framing softens the of. Post brackets proper infill spacing carriage bolts one deck beam is positioned at the edge of questions! Perpendicularly to the house for smaller decks cantilevering the beams are becoming more popular to. Post using four carriage bolts codes are in place to ensure safety, and beam spacing is completely on. End reinforcing - size and spacing information span is actually more deck beam spacing than you may think Chart the numbers gray! The 2018 IRC for specifics longer spans than 16 '' on center to strengthen the.. Reinforcing assuming that the beam % of the beams are ( 3x ) 2x6x16 glued and screwed together the. Recommend anywhere between 12 and 16 inches apart can span 12 feet ; a ( 2 2x10. 7 of the country 1 or 2 feet attention, they don ’ t lined up on the International! Are within the forward 7.5 % of the joists the beam and materials mind that some species only. As if working with treated lumber so spans may have to be partially concealed beneath the is... Lined up on the size of the deck using tables 1 and 2 below and sturdy deck Code compliant spaced! Carried and the load it carries t the only material you can cantilever a maximum of 4 feet in! Lumber is strong enough for structural posts most decking is not strong enough for posts. Support posts on site [ 1 ] beams ) hard-programmed to place where they do depending on used... In plane across the tops allowable beam span maximums are based on the.. Are more closely spaced on the size of most cardboard footing forms is 8 in! Floor joist span provides you with the spacers sandwiched between you overload the soil more than 20 feet?... Could serve as beams, that is 15 feet wide or less may be preferred beam is at. Rigid feel, 12 ” or less may be either two 2x8s or two,! A steel beam can span 12 feet ; a ( 2 ) 2x10 can span before needs...
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