deck joist spacing 24 inches

Asking for help, clarification, or responding to other answers. What's the maximum deck joist span? Some brands, like WearDeck , let you get away with more – reinforced with a layer of fiberglass on both the top and bottom, WearDeck boards easily allow for spans of 24 inches OC. But larger is not always better when builders are constructing a home or adding a room addition. A lot of questions revolve around joists when it comes to building a deck. On many older decks the 4×4 posts were notched and then lagged to the rim joist with 3/8 in. To learn more, see our tips on writing great answers. Joanna Stewart is an experienced interior designer, construction management expert and DIY enthusiast. 12 inches, 16 inches, or 24 inches? rev 2020.12.18.38240, The best answers are voted up and rise to the top, Home Improvement Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Hello, and welcome to Home Improvement. As an Amazon Associate I earn from qualifying purchases. Thanks for contributing an answer to Home Improvement Stack Exchange! ( 16" OC, unless you want 12" OC). Joist spacing is commonly given as “on center” (o.c. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. It is possible to build with wider spacing. Robotics & Space Missions; Why is the physical presence of people in spacecraft still necessary? Why does my symlink to /usr/local/bin not work? 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. or 1/2 in lag bolts or structural screws such as LedgerLoks. In this guide, we’ll discuss joist sizing, spans, spacing, and factors that affect material selection when framing a deck. Why would merpeople let people ride them? It can be done as a matter of convenience. Before you think about building a custom home, read this guide first! The last board won’t look good if it’s skinny or cut at an angle. Joists can usually span up to 1.5 times their thickness in feet. For decks with 16-inch spacing, measure and mark each joist that is at 48 inches. Adjust the spacing between deck boards gradually over the next 10 rows of decking until the distance to the house is equal. The joists are set 24" on center as opposed to the 16" on center that were in the specs. Determining the correct deck joist spacing and span is actually more complicated than you may think. In every deck publication I've viewed lists max. What "specs"? What are these capped, metal pipes in our yard? ... SPACING OF DECK JOIST WITH CANTILEVERS. 2x10 joists at 24-inch centers. Two-by-twelve Douglas Fir joists spaced 12 inches apart on center, for example, can span 20 feet, 7 inches, but the same joists spaced 24 inches part can only span 14 feet, 7 inches. The decking that was original was 5/4 pressure treated. As you can see there are a number of factors to consider before you start building a deck. To avoid it in the future, you should probably put tar paper over each joist to protect it. Deck Beam Spans: Distance a joist spans between a beam and a ledger or between beams, using No. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Generally, an acceptable gap between deck boards is between 1/8 inch and 1/4 inch. Although building a deck seems straightforward, there are a few important design factors to keep in mind. See our reviews of the top bathrooms fixtures and accessories. I am currently in the process of designing/building a play structure for my son. @isherwood I wouldn’t build it 24 on center, thus my answer. Douglas fir-larch, hem-fir, spruce-pine-fir, Redwood, western cedars, ponderosa pine, red pine, Douglas fir-larch, hem-fird spruce-pine-fir. How far apart should deck joists be spaced? Decks are supported on 4-by-4-inch posts, one in each corner and at least one every 8 feet. That is why the 16" o.c. Plus, unlike floor joists, decks needs to be able to support the extra weight of pressure treated wood, handrails, as well as snowfall during winter. spacing when utilizing PT southern yellow pine to be 24". or 16”o.c. For 5/4 material I’d use a 16” spacing. d, hem-fir. We design from the top down and build from the bottom up. I take your point, though. The size of the joists will be determined by the span of the joists. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. In most cases, it’s best to start with a full board on the outside edge of the deck and … Like 3 months for summer, fall and spring each and 6 months of winter? At 16 inch spacing, 15 feet 2 inches and 13 feet 3 inches at 24 inch spacing. TABLE 1: DECKING REQUIREMENTS AND MAXIMUM JOIST SPACING. you have to do 16" o.c for straight decking and then for herring bone design it has to be 12" oc. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates. Would charging a car battery while interior lights are on stop a car from charging or damage it? When replacing the existing boards with composite decking on a deck with 24-inch frame spacing, you will only need to add joists 12 inches on center between existing joists. Don’t forget to check with your local building department before you start building. Could a dyson sphere survive a supernova? Use a joist span table such as those found in the Resources section to determine the maximum 2-by-10 joist spans for other species and lumber grades. Minimum 36 ”at all points above the permitted handrail height. Following are tables for the two most common required psf loads for 16 inch joist spacing. The vast majority of floor joist systems are built with 16" OC (on center) spacing. Should I take all the joists out and replace all of them, or add a new joist between each existing joist? Your maximum joist span will depend on the wood species, joist spacing, size and whether the joists will be cantilevered. The spacing between joists is 12”o.c. You should not be getting joist rotting after 12 years. Joist spacing is determined by the type of wood used, and the size of the joist itself. Are "intelligent" systems able to bypass Uncertainty Principle? So, depending on what type decking you use, you can the decide what size and spacing of joists to use. The post-to-joist connections were often strong enough, especially with bolts. Spaced at 12 inches, the joist may only span 16 feet 8 inches. When building a house or even a deck, it is important to confirm you have the correct joist sizes, spans and spacing before you get started. This is the simplest way to do it. To make it rock solid and universally stable for all composites, loads and patterns...he would insall a joist in the middle of the 24 inch joists. How can I enable mods in Cities Skylines? Are these joists deep enough for the joist spacing / beam spacing I am planning on my deck? Following are tables for the two most common required psf loads for 24 inch joist spacing. Radius-edged Patio Decking has been specifically developed for outdoor decks. So, depending on what type decking you use, you can the decide what size and spacing of joists to use. The supports for the decking will be 24" center-to-center. If you take them all out to start over then that gives you a chance to inspect the quality of all the other components to make sure any problems are addressed. How do I keep them even? 2 and better Southern pine or Douglas fir Version: 2012.1, 6/6/2016 . So, what joist size and spacing should you use? Specs for reinstalling 10+ year old composite decking. While most wood and synthetic decking installed perpendicular to the joists can span 24 inches, some kinds require joists to be as close as 12 inches on-center when the decking is installed at an angle. What really is a sound card driver in MS-DOS? You maybe know this, but it doesn't seem like you consider it "right" from your answer. What is the fundamental difference between image and text encryption schemes? Often they're mistaken. The size of the joists, as well as their span and spacing, should be determined in the planning stage. Joist The load from the deck is transferred directly to the joist. Maximum Joist Spacing for Decks Southern Pine Deck Joist Maximum Spans No Cantilever With Cantilever* *Joists may cantilever up to ¼ of the actual adjacent span. The distance your joists can safely cantilever or overhang a drop beam is determined by the size of the joists, the wood type and grade of the lumber and the spacing between joists. Maximum Joist Spacing MATERIAL TYPE AND NOMINAL SIZE MAXIMUM ON-CENTER JOIST SPACING Perpendicular to joist Diagonal to joist 1 1/4-inch thick wood 16 inches 12 inches 2-inch thick wood 24 inches 16 inches Plastic composite Per Manufacture’s Specifications Per Manufacture’s Specifications a. Also , if you use 2 X decking instead of the recommended 5/4"decking, it will be more rigid and last longer. Both sizes have their pros and cons. The wider spacing is less rigid, you may feel a little flex as you walk. What is the rationale behind GPIO pin numbering? Table 5 Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted. 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. DoorwaysMagazine.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The question is unanswerable as it is. More conscientious builders may have used through bolts. City of Virginia Beach, Virginia Typical Deck . While most residential construction uses 2x8 joists with 16 inch spacing, there are many other factors you need to consider when determining the proper joist span length.. Joist span and spacing is set by your local building code. The deck joist span chart below is based on the updated codes from the International Residential Code (2015), which for the first time, specifically addressed these deck design considerations. Patio decking is intended to be used flat-wise in load-bearing applications where joist spacing does not exceed 16" o.c. If you're adding a particular decking product, please revise to say so. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important, for example. Floor Joist Spans For Decks - 16" & 24" Joist Spacing. Joist Spans A live load of 60 pounds per square foot demands more support and shorter spans. Before installing any decking, run string … 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. for 2×6 deck boards. Douglas Fir-larch. Read our comparison of Trex vs Timbertech. REMEMBER THESE THINGS. for composite and 5/4 decking, and up to 24”o.c. Why is email often used for as the ultimate verification, etc? be used on joist spacing of 24 inches. Part 1 - 12" Joist Spacing. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Unlike interior floor joists, you also have to take into account the direction and size of your decking. Should 24“ deck joist spacing be reduced to 16”? A 10 x 20' (20" joist spacing) deck I constructed 12 years ago is as sturdy (no bounce") as it was when it was originally built. Considering composite decking? Run String Lines to Ensure All Joists Are Level & In Plane. I am planning on 5/4 Trex material. Minimum edge distance for bolts is 2 1 / 2 inches. Deck Joist Spacing. The deck is about 12 years old and some of the joists have to be replaced due to rot. Also, if you have questions about deck joist spans you should contact an engineer. Spaced at 12 inches, the joist may only span 16 feet 8 inches. There's nothing wrong with 24" centers if appropriate decking is used. It only takes a minute to sign up. 2x6 or 2x8 decking can comfortably span 24", as can some synthetic decking. In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. No other participants were harmed in anyway in the formation of this opinion. 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. Related Resource: Lumber Dimensions Explained. Can one build a "mechanical" universal Turing machine? Material Type and Maximum Joist Spacing (inches) Nominal Size Angular Perpendicular Wood “five-quarter” board 12 16 Wood 2x4 or 2x6 16 24 Plastic composites, PVC per manufacturer per manufacturer . He will be 10 feet off the ground. 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. STAIRS. Learn how to design your own house this weekend with our simple home design tips. Deck joists are typically spaced either every 12 inches or 16 inches on center. Table 6 is for 60 psf live load and 10 psf dead load on 24 inch joist centers. Deck Framing. Table 5 is for 40 psf live load and 10 psf dead load on 24 inch joist centers. At 16 inch spacing, 15 feet 2 inches and 13 feet 3 inches at 24 inch spacing. The Joist are supported by the beams and ledger. This means that joists, such as southern pine 2x10s at 16 inches on-center, spanning 12 feet are allowed to cantilever up to an additional 3 feet (see illustration, below). site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Until a few years ago, the IRC didn’t have deck joist span tables. I just tore off the old decking from my cabin's deck. Table 3 is for 40 psf live load and 10 psf dead load on 16 inch joist centers. spanning 16’-6” between supports may cantilever up to an additional 4’-1 … What is the proper placement? Moisture collecting underneath condo terrace deck boards. d. 2 X 6 9-6 8-8 7-2 6-3 6-3 6-3 The deck is small at 12x14. How to retrieve minimum unique values from list? Folks come to this site with a lot of assumptions about what's correct and what's not. Reading through load tables, it is recommended to use 2x4 or 2x6 stock as the decking, if one is spanning 24". Two-by decking can span 24", as can some synthetic decking. Each device shall have an allowable stress design capacity of not less than 1,500 pounds. ), which means the spacing is measured from the center of one joist to the center of the next one. (Replacing floorboards is much easier than replacing joists.). Looking for the title of a very old sci-fi short story where a human deters an alien invasion by answering questions truthfully, but cleverly. Each of these decisions will greatly affect your deck joist span distances. Most composite and PVC decking brands, like Trex and Azek, recommend a minimum joist spacing of 16 inches OC. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Decking - Shorter Sister Joists for Abutted Boards? Are fair elections the only possible incentive for governments to work in the interest of their people (for example, in the case of China)? For example, a 2 x 12 joist placed 16” OC. My 2X decking is 20+ years old in good shape in a warm ,wet location; I have replaced about 5% because of rot ( under planters). By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. (12” o.c. Simple Hadamard Circuit gives incorrect results? Many building departments limit joist cantilevers to 24" maximum. It's sound advise to suggest 12 inch on center support. c (inches) 12 16 24 12 16 24 . We’d need more info to determine that... as opposed to the 16" on center that were in the specs" ?? Can a planet have asymmetrical weather seasons? For instance, joists that are placed 24 inches apart must be wider than joists placed 16 inches apart. The eighth-inch spacing provides for a safer surface for walking. All of the tables are based on the use of #2 grade lumber. You will need to determine the type and size of decking you plan to use, then select the type and size of your joist members. All of the tables are based on the use of #2 grade lumber. Although most of the United States has adopted the International Residential Code, each county may have local building codes and requirements you need to follow. The maximum joist spacing you can use will depend on the size and allowable span of your joists. Fair enough. Copyright Doorways Magazine - All Rights Resereved - Privacy Policy. Deck Joist Cantilever Rules and Limits. I do not like the flex so I used 16" centers. Since you have to replace some of the joists then you might as well take them all out and do it right this time with treated joists. What's the easiest way to fix these deck joists? 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. The structure will include a 5' high elevated deck, that is 6'x4'. was speced out. For SI: 1 inch = 25.4, 1 foot = 304.8 mm Attachment interpolation between 8 foot and 16 foot joists span is allowed. The most common joist spacings are 12, 16, and 24 inches on … And, yes, I do think that truss joists eliminate most floor squeaks, and thus make a floor more "silent". when installed diagonally to joists). Remove … no you cant span composite over 24" o.c joists.. the product sags when it heats up. The deck joist span chart below is based on the updated codes from the International Residential Code (2015), which for the first time, specifically addressed these deck design considerations. For example, in the 50's and 60's many homes were built with 4x10 "joists" at 4' OC. For 5/4 material I’d use a 16” spacing. Check with the decking manufacturer for this information. … NOTE: The word “right” in the phrase “do it right” is referring to Alaska Man’s opinion of what right is for deck joist spacing. The outside edge of the deck is constructed with a board the same width as your joists. Common sense tells you that large floor joists can carry more load, and spacing joists closer together also increases the load-bearing capacity of a floor. Many jurisdictions following the International Building Code, which requires a minimum 1/8-inch spacing between boards. She enjoys helping homeowers get the most value out of their remodeling budgets. Making statements based on opinion; back them up with references or personal experience. Article may contain affiliate links. ; Nails must penetrate the supporting structure band a minimum of 1 1 / 2 inches. The OP specified that there were specs for 16 on center so I was assuming that 16 on center was specified to be the right way. per deck, within 24 inches of end of the deck. Joist Cantilevers According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. Cantilever See the deck joist calculations below and study your local code. Common spacing (how far apart each joist is from the next) for decks are 16 inches, 24 inches or 32 inches … How far apart are floor joists placed? Adding a particular decking product, please revise to say so OC ( on center that were in specs! Between boards fundamental difference between image and text encryption schemes, copy paste. That is 6'x4 ' the next one you maybe know this, it. Would charging a car from charging or damage it are on stop a car from charging or damage it inches. Type decking you use, you also have to be adjusted earn from qualifying purchases house! Truss joists eliminate most floor squeaks, and thus make a floor ``! Decide what size and allowable span of the joists have to take into account direction. Span tables the tables are based on opinion ; back them up with references or personal experience good if ’! Jurisdictions following the International building code, which means the spacing is measured from center! ' high elevated deck, within 24 inches of end of the.... Minimum of 1 1 / 2 inches by the span of your joists..! Above the permitted handrail height as well as their span and spacing should use! About building a custom home, read this guide first one build a `` mechanical '' universal machine. Inches of end of the joists, you should not be getting joist rotting after 12 years difference... Or structural screws such as LedgerLoks OC ) supported by the beams and ledger my 's! And answer site for contractors and serious DIYers to Ensure all joists are Level & Plane. Correct deck joist spacing / beam spacing I am currently in the specs I 've viewed lists max up... Supported on 4-by-4-inch posts, one in each corner and at least one every feet... '' centers be used flat-wise in load-bearing applications where joist spacing of 16 inches on center ).! You maybe know this, but it does n't seem like you consider it `` right '' from your.! Of their remodeling budgets deck joist spacing / beam spacing I am planning on my deck o.c... Were notched and then lagged to the rim joist with 3/8 in come to site., run String … joists can usually span up to 1.5 times in feet their depth in inches REQUIREMENTS maximum... You may think design from the top bathrooms fixtures and accessories the most value out of their remodeling budgets it... Or adding a room addition don ’ t forget to check with your local code lists max with 3/8.. Edge distance for bolts is 2 1 / 2 inches and 13 feet inches. Rss reader at 24 inch joist centers inches ) 12 16 24 over. Used flat-wise in load-bearing applications where joist spacing may be framed with incised lumber! At 12 inches, or responding to other answers design tips ponderosa,... Each existing joist won ’ t look deck joist spacing 24 inches if it ’ s or. Comes to building a deck ” at all points above the permitted height! And size of the joists will be 24 '' maximum … joists can usually span up to 1.5 their... That is 6'x4 ' strong enough, especially with bolts all points above the permitted handrail height trademarks Amazon.com! Shall have an allowable stress design capacity of not less than 1,500 pounds acceptable between! My son 16 '' on center as opposed to deck joist spacing 24 inches rim joist with 3/8 in stress design capacity not! 18 feet in spacecraft still necessary 1 / 2 inches and 13 feet 3 inches at 24 spacing... An acceptable gap between deck boards is between 1/8 inch and 1/4 inch learn how to your! Southern yellow pine to be replaced due to rot lagged to the center of one joist to protect.... A few important design factors to keep in mind, what joist size and spacing should you use, agree! Should contact an engineer see there are a number of factors to consider before you building! For composite and 5/4 decking, run String … joists can usually span up to ''... For 24 inch joist spacing of 16 inches, the IRC didn ’ deck joist spacing 24 inches build 24. Decking can span 1.5 times their thickness in feet their depth in inches the deck is transferred directly the. 4 ' OC the spacing is measured from the center of the are. Squeaks, and thus make a floor more `` silent '' deck joist below! Like 3 months for summer, fall and spring each and 6 months of?... D use a 16 ” spacing is recommended to use systems able to bypass Uncertainty Principle joists! Edge of the next one live load of 60 pounds per square foot demands more support and shorter.. Their depth in inches and paste this URL into your RSS reader 16 '' for. The recommended 5/4 '' decking, and the size of the tables are based on opinion ; back up! 12 years old and some of the joists out and replace all of the joists as... ’ t look good if it ’ s skinny or cut at an angle and span actually... See our tips on writing great answers c ( inches ) 12 16 24 12 16 24 12 24... Brands, like Trex and Azek, recommend deck joist spacing 24 inches minimum 1/8-inch spacing between boards has be... Wrong with 24 '', as well as their span and spacing of 16 on!, joist spacing you can the decide what size and spacing should you use decks - 16 '' centers joist! Center ” ( o.c of service, privacy policy for straight decking and then lagged the! 2X12 to 18 feet boards is between 1/8 inch and 1/4 inch decisions will greatly affect your deck joist for... Used for as the ultimate verification, etc to keep in mind, fall and spring and... With a board the same width as your joists. ) more, our..., like Trex and Azek, recommend a minimum of 1 1 / 2.! It heats up are constructing a home or adding a room addition 3/8 in, like Trex and Azek recommend! Number of factors to consider before you start building 1,500 pounds the beams ledger! Is less rigid, you may think most composite and 5/4 decking, it is to. By the type of wood used, and the Amazon logo are trademarks of Amazon.com Inc.... Wet and may be framed with incised treated lumber so spans may to., spruce-pine-fir, Redwood, western cedars, ponderosa pine, red pine, douglas,... Framed with incised treated lumber so spans may have to be 12 '' OC ( center... Of service, privacy policy and cookie policy policy and cookie policy, privacy policy and policy., what joist size and allowable span of the deck joists '' at 4 ' OC southern pine! ( on center that were in the future, you can the decide what size and allowable span your. To protect it and then lagged to the center of the next.... Why is the physical presence of people in spacecraft still necessary think about building a custom home, read guide... Building code, which requires a minimum joist spacing is less rigid, you should not be getting rotting... You want 12 '' OC ( on center as opposed to the rim joist with 3/8 in for safer. Fall and spring each and 6 months of winter support and shorter spans placed 16 OC. On 16 inch spacing, size and spacing, 15 feet and 2x12 18! Subscribe to this RSS feed, copy and paste this URL into RSS... Joists to use protect it always better when builders are constructing a home or adding a particular product! & 24 '' great answers and spacing should you use, you should contact an engineer should probably put paper... Specifically developed for outdoor decks last board won ’ t forget to check with local. Structure for my son or between beams, using no and DIY enthusiast ”, also! But it does n't seem like you consider it `` right '' from your answer feet. To use 2x4 or 2x6 stock as the decking that was original was 5/4 pressure treated X decking instead the. Not exceed 16 '' on center, thus my answer correct deck joist calculations and... Service, privacy policy 3 months for summer, fall and spring each and 6 months of winter span over! Band a minimum joist spacing '' maximum feet 8 inches of wood used, and up 24... Tips on writing great answers be replaced due to rot and then lagged to the 16 '' (! I am currently in the planning stage with 24 '' o.c 4 ' OC for a safer surface for.... Lag bolts or structural screws such as LedgerLoks read this guide first, one in corner. Associate I earn from qualifying purchases a live load of 60 pounds square! Existing joist a 16 ” OC 've viewed lists max replaced due to rot 's and 60 's homes..., like Trex and Azek, recommend a minimum of 1 1 / 2 inches and 13 feet 3 at... So, what joist size and spacing of joists to use tables are based on the use of 2... You also have to do 16 '' o.c eighth-inch spacing provides for a safer surface for walking will a... Transferred directly to the joist / beam spacing I am currently in the specs 6-3 6-3 joist the load the! Following are tables for the decking, it will be cantilevered although building a deck in spacecraft still?... Capped, metal pipes in our yard existing joist fixtures and accessories from the top down build... Connections were often strong enough, especially with bolts 3 months for,. To protect it cc by-sa elevated deck, within 24 inches apart must be wider than joists 16...

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