2x8 floor joist span chart
The IRC 2018 does not specify a maximum span for pergola beams. But there are some instances when joist spans might matter to you: Floor Joint Spans for Common Lumber Species. 2x8 14'-2" 2x10 18'-0" #2 Y.P. The classifications include appearance as well and will look at streaks, burls, and other imperfections. Only emails and answers are saved in our archive. Next, best is 2x8 16" O.C. The maximum span for roof rafters is 23' 9". Additionally, well discuss using 2x8s for joists, headers, rafters, and beams to provide an in-depth look at their structural use in your project. Resources provide a simplified system to determine allowable joist and rafter spans in one- and two-family dwellings, and the companion supplements for tabulating allowable bending and modulus of elasticity design values for visually graded and mechanically graded dimension lumber. 2x8 2x10 2x12 2x6 2x8 2x 10 12 16 24 12 16 24 12 16 24 12 16 24 15-6 13-11 11-4 13-6 12-3 10-0 17-10 15-6 12-8 . When building a sturdy structure or frame, it is crucial to know how far the joists and beams can span without support. Generally, a 2x8 or a 2x10 floor joist is the most popular option. The outer gray walls are the concrete foundation walls which support the floor joists. The roof span is the distance from outside bearing wall to outside bearing wall measured horizontally from outside top plate face to outside top plate face. Home > Joist Span Calculator 19.2" o.c. Small House Floor joist spacing is the topic of this article. Eugene has been a DIY enthusiast for most of his life and loves being creative while inspiring creativity in others. These calculators provide a good baseline or reality check but should never be used as the final authority. The spacing between joists and rafters determines the floor, ceiling, or roof area a structural member must support. When determining the span of a floor joist, use the horizontal distance between two vertical supports (see diagrams below and above). US East US West BC Calc Figuring load capacities and picking the right floor joist sizes and spacing is a more complicated task than you might imagine since there are many variables at play: Engineered wood floor joists, which have their own sizing and spacing requirements, are also available. Based on different manufacturers specifications, the maximum span a 28 LVL is from 12 to 15. The location where you live plays an important role in choosing wood for your joists. L/360 deflection. There are different depth of floor joist are used in floor construction such as 26, 28, 210 and 212, made of different species of wood (southern yellow pine & Douglas fir) and different grade such as grade 1, grade 2, grade 3. Illegal Internet copies will be detected by Copyscape. 19.2" o.c. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. However, the maximum is determined by the species and grade of wood, the spacing, the load, and more. Their function is similar as beams, except floor joists are supported by wall, foundations, or beams framing. Lee has over two decades of hands-on experience remodeling, fixing, and improving homes, and has been providing home improvement advice for over 13 years. To calculate maximum spans of species not shown above, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website. FLOOR JOIST SPANS FOR COMMON LUMBER SPECIES (Residential sleeping areas, live load = 30 psf, L/ = 360) a For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa. Depending on various factors, the maximum span for a 28 floor joist is 16' 6". Headers, based on building width, number of floors, and exposure may span from 3-1 to 11-2. These applications will - due to browser restrictions - send data between your browser and our server. The house will be 52 ft by 32 feet. Live Load 30 lbs/ft2 (1436 N/m2) Max. You may be able to get away with another 1 to 2 feet depending on the species and grade of the wood but should avoid going past that. http://ths.gardenweb.com/forums/load/oldhouse/msg1021090512629.html. Species, grade, spacing, and loads make a big difference when building with 2x8s or other dimensional lumber, as does the use planned for the timber. The above spans are based on American Softwood Lumber standard sizes. Joist, rafter, header, and beam spans are important structural factors, so if youre wondering how far can a 28 span without support, were here to help. How thick is a 2, 3 & 4 ply LVL beam, 10/12 roof pitch rafter length | How long is a 10/12 pitch roof, What size floor joist to span 10′, 12′, 15′, 16′, 18′, 20′, 24′ & 25 feet, How far can you span a 26, 28, 210 and 212 floor joist, How far can a 210 ceiling joist span without support. Reference design values are for normal load duration under the moisture service conditions specified. But first, generally, how far can a 28 span without support? Although we have all probably seen a few structures that give us pause. I was looking for this information myself. However, if you double the width, then the span can increase significantly. To calculate maximum joist spans using different design criteria (loading, spacing, grade, etc. Depending on factors and loads, ceiling joists for an uninhabited attic can span from 10 with SPF #3 and exceed 26 with structural select (SS) Douglas fir-larch. The unique grade will be based on imperfections like knots as well as overall performance. Copyright 2009-2023 www.mycarpentry.com | Privacy Policy | Contact Us. As a general rule of thumb for beam sizing for a deck (figure that's more load than a pergola roof), if you're supporting joists that span 12 ft (almost your size), then a doubled 2x12 beam itself can span 12' (the number of ft of span = the doubled beam nominal depth in inches). This can help plan the layout for the location of hanging hardware. The span differs when used as a beam, floor joist, ceiling joist, or rafter. Depending on loads and spans, C-Joists are typically spaced at 12", 16", 19.2" or 24" on-center spacing. RigidLam LVL Floor Span Tables Riddle OR 1-1/2" 1.3E RigidLam LVL Floor Spans - 40 psf Live Load, 12 psf Dead Load Simple Span Multiple Span L/480 12" o.c. When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies. The values displayed in the resulting table will show three possible joist dimensions and spacings depending on the restraining method used. A nominal 2x10 (1.5x9.25) deflects .009 inches under a 300 kg centered point load with both ends of the beam fixed in all directions. University of Tennessee Extension. While this does not include other factors, it can still give an idea of how depth can affect span. There are different factors that affect how far a 28 can span, including use or location, species of wood, grade, the spacing between joists or rafters, and load. The picture below shows a plan view, that means looking straight down from above the house. Maximum spans are inside to inside of bearings . A 28 roof rafter, like any other structural member, will have a span based on various factors. A rafter of the same material, though, may span 14-5 at 12oc, 13-1 at 16oc, 12-4 at 19.2oc, and 11-0 at 24oc. double 2x8 spans | The Building Code Forum. The span tables on this page are based on the #2 grade of four common species of lumber. Finally, a single deck beam has a maximum span of 5' 11" and double maxes out at 8' 9". Depending on the species, grade, and spacing, a 28 may span between 7-1 and 15-0. A tripled #1 SPF 28 beam will span from 5-8 to 9-8 and #1 Southern pine 6-4 to 10-10. The problem is, inspectors (and many structural engineers, sadly) treat these as nominal framing. In general, all lumber is stamped near the end of the lumber piece by the manufacturer. Whilst This Wood Flooring Calculator Will Give You A Rough Idea On. Joists & Rafters Simplified maximum span tables for selected visual and mechanical grades of Southern Pine lumber in sizes 24 thru 212. Therefore, in colder areas, the live load must be increased up to 70 psf. 2x12 2x6 2x8 2x10 2x12 Note: Deflection is limited to the span in inches divided by 240 for live load only. CanadianRockies said: I'm hoping to use 4x4 (nominal) wood beams as living room floor joists, but none of the online span tables/calculators seem to handle 4x lumber. NOTE: The span tables listed here are based upon design values for visually graded Southern Pine dimension lumber that became effective June 1, 2013. For headers, the maximum span is 11 2. All rights reserved. 210. Rafters span from the top plate to ridge board or beam but may have intermediate support from purlins and braces, collar ties, or raised rafters. Call your county or city. For example, joists spaced 16 inches from the center of the joist next to it can span 1.5 times in feet the depth of their inches. The design values contained herein are based on the Southern Pine Inspection Bureaus Standard Grading Rules for Southern Pine Lumber and modified as required by the American Wood Councils National Design Specification(NDS) for Wood Construction. The longer the spacing, the shorter the allowable span. In many circumstances, 16 inches would be your standard spacing for shed floor joist, but this is just a rough guideline. Non-living areas often have lower load ratings as well. There are no set sizes that are to be used in residential construction. 3 / Stud / Stand & Btr. The combination of joist size and spacing also determines the strength value, Fb, and the stiffness value, E. For example, a 28 floor joist made out of southern pine has a 2650 Fb and the same 28 will have a higher Fb, 3040 Fb, when utilized for roof rafters. Spacing is the area between joists or rafters and is important to accurately identify the area that the structural element has to support. The full version allows any. As a do-it-yourselfer, you don't need to know about joist spans to paint a bathroom or add a floor covering. A look at a rafter span table shows the allowable spans are between 6-7 and 23-9, depending on the factors and loads. Listed are 46 tables based on common loading conditions for floor joists, ceiling joists and rafters. 1 psf (lbf/ft2) = 47.88 N/m2 1 ft = 0.3048 m 1 in = 25.4 mm Max. The larger the deck, the larger the joists. See the image below for an example of joists spaced 16" on center (16" o.c.). ), and the spacing of the ceiling joists. Without properly calculated and built joist spans, permits don't get issued and buildings don't get built. While not as strong as the higher grades, the flaws in 2-grade lumber are generally not enough to seriously weaken the boards. dead load (weight of structure and fixed loads) 10 lbs/ft2. Note: Check sources for availability of lumber in lengths greater than 20 feet. After selecting the species and the use, you also need to take the load, grade, and spacing into account to determine how far the 28 will span without additional support. Span Options Calculator for Wood Joists and Rafters Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. For each application, a PDF download is available. If you are using a very small screen or smart phone, rotate your device to landscape view to use the calculator below. Therefore, the roof rafter span will be within the range of 6 ft. (being the minimum) to 23 ft. 9 in. This causes the load to apply pressure differently than it does with joists or beams. Lally Column vs Jack Post: Whats the Difference? Ive never seen even a meager attempt at a span table for actual size lumber. They transfer the dead load of the subfloor and floor finishes and live load of people, furniture and furnishings to beams, walls, headers, or foundation walls. Can I use a 2x8 for a ceiling joist and rafters on a 16 from diy.stackexchange.com. Based on all factors though, a 28 joist span is 7'-1" to 16'-6", and a rafter 6'-7" and 23'-9". The maximum span for roof rafters is 23 9. IRC 2003 . About Us The classification, grade, and bending strength help determine use within a structure. No part of this web site may be reproduced or copied without written permission. Knowing the allowable span will help you determine where the lumbar requires support for stability. Using a span calculator for #2 Southern Pine lumber, a triple 2x8 beam can support a maximum allowable span of approximately 8 feet when supporting a total load of 550 plf. Microsoft Word - Deck Span Table.doc Author: fred Created Date: 12/2/2005 8:27:08 AM . When used as a ceiling joist, it can exceed 26 at 12oc, 23-10 at 16oc, 22-5 at 19.2oc, and 20-1 at 24oc. 16" o.c. Spacing is measured from the center of one joist, rafter, or beam, to the center of the next joist, rafter, or beam. You will however, need to become familiar with reading your local floor joist span tables for floor beams, floor joists, window and door lintels, ceiling joists, roof joists, roof rafters, and roof ridge beams, as well as the sizing and spacing of wood studs tables. To use the joist span calculator below, first select the species of lumber you will use for your construction project from the drop-down list. The printed version of 'From the Ground Up' by Wing and Cole has everything you need and ought to be required reading. The pitch of the roof would be about a 4 pitch. The species, type, or kind of tree determines the structural strengths of the timber and impacts support, flexing, and compression abilities. Get daily tips and tricks for making your best home. A 212 (2-by-12) floor joists can span up to 23 feet 3 inches, 210 (2-by-10) up to 19 feet 1 inches, 28 (2-by-8) up to 15 feet & 26 (2-by-6) up to 11 feet 4 inches at 16 spaced by using southern yellow pine graded as #1 when live load of 30 lbs/ft^2 & dead load of 10 lbs/ ft^2. An actual 2x10 (2x10) deflects .0064 under the same loading conditions. Welcome to the new and improved Building Code Forum. A double 212 beam can span 12 feet; a (2) 210 can span 10 feet and so on. Actual length is measured from the outer edge of the cleat or birdsmouth to the receiving face of the ridge board or beam for unsupported span. How far can a double 26 beam span 1 and No.2 Grade of Hemlock-Fir, Table valid for No. This article includes the different factors and how they can affect the span of 28 wood and the amount of weight a 28 can hold and how you can estimate the span. Since many different factors can influence 28 span, The International Residential Building Code (IRC) of 2018 offers maximum span, also known as allowable span, for joists, beams, headers, and rafters as a reference for building codes. Overview Resources provide a simplified system to determine allowable joist and rafter spans in one- and two-family dwellings, and the companion supplements for tabulating allowable bending and modulus of elasticity design values for visually graded and mechanically graded dimension lumber. Common lumber grade designations include: These designations and numbers will become important when you are reading your structural tables since the strength of a wood depends on its designations. . So if you are a civil engineering student this is the best platform where you can improve your knowledge. The live and dead load rates combined are also important. 40lbs live 10 lbs dead (living areas) 12" O.C. If you are just starting out, you might want to start at our previous page, residential structural design page which explains basic house structure. 24" o.c. 16" O.C. This also reduces the need and cost for extra bearing posts, beams, and footings. Grade #1 is the strongest and typically utilized for construction projects, while #2 is also commonly used for support. Live load is weight of furniture, wind, snow and more. Lumber Grade 2 x 8 12 15 - 10 16 14 - 5 24 12 - 4 Live Load 30 lbs/ft2 . The dead load is calculated by adding together the weight of the building materials and dividing by the square footage. 9.23.4.2. As you can see, the larger the depth, the longer the span. That will be the distance that you can cantilever the joist. New York City Building Code. We also know that the floor provides a stable ground for the rest of the building structure, so it needs to be strong, firm, and well-leveled. Floor joists usually run between walls or rafters to support a ceiling or floor. In general, cantilevers should not extend beyond of the span of the joists themselves. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 2 x 8 Floor Joist Spans 2 x 10 Floor Joist Spans 2 x 12 Floor Joist Spans A ceiling joist usually has a dead load rating of 5psf and an uninhabited non-storage live load of 10psf. They will not apply to single member spans, nor do they apply to decks. is going to be your most expensive framing option. The stamp displays several types of information. Neither SFPA, nor its members, have knowledge of the quality of materials, workmanship or construction methods used on any construction project and, accordingly, do not warrant the technical data, design or performance of the lumber in completed structures. The manufacturers provide span sheets since the IRC doesnt; a good practice is to check with a Structural Engineer. When doubled, the range increases to 5 to 8 9 and when tripled, it increases from 3 8 to 10 10. APA PRIs are recognized through ICC-ES ESR-1405. I realize that without a structural stamp, its hard to tell the exact attributes of such wood. http://ths.gardenweb.com/forums/load/oldhouse/msg1021090512629.html, A Look at State Premiers New Heat Pump Water Heater, Indoor Air Quality and Building Diagnostics. But everyone needs to know that the minimum or maximum allowed may not produce desirable results even though it is to code. The narrow double lines show the floor joist themselves. Accordingly, neither SFPA, nor its members, warrant that the design values on which the span tables for Southern Pine lumber contained herein are based are correct, and specifically disclaim any liability for injury or damage resulting from the use of such span tables. We don't collect information from our users. Draw an X on the side of the line where you want your boards to set. Whereas, with Redwood hemlock or western red cedar, the span will be on lower side i.e. Span entries are listed for 26 through 212 joists and 12 in., 16 in., and 24 in. Let's start with a simple, very small house 12 feet wide by 13 feet long. A rule of thumb is 1.5 times a joist's depth but in feet when spaced at 16" centers. The live load is the temporary load and accounts for furniture, people, pets, and anything else that is not permanent. I'm not an engineer, but I found this while Web surfing: "A [planed] 2x8 is actually only 1.5 x 7.25 inches. You can even triple the 28 floor joists for an even greater span. Span (feet-inches) Floor Joists - 40 psf Live Load, 10 psf Dead Load, L/360 . We recommend checking your local codes or with the experts when determining beam or header spans. Maximum floor joist span for No. Southern Pine has a higher span than other popular types of wood. Copyright 2023 CivilSir Douglas fir 2-by-10 joists graded as "Structural Select" allows joist spans up to 21 feet for a live load of 30 pounds per square foot when spaced 12 inches apart, 19 feet 1 inch for 16 inch spacing and 16 feet 8 inches for 24 inch spacing. To learn more about deck joist sizing, spacing, and allowable span, reference this chart. Guest PostContact usPrivacy policySitemap, LVL beam: Sizes, Cost, Span, Calculator and price, Average roof height 1 storey and 2 storey house, How much siding do i need for a 1,500 square foot house, How many studs do i need for a 1010 shed, : 12mm, 10mm, 8mm, 16mm, 20mm 25mm , : (8 , 10 , 12 , 16 20 ), What is the rough opening for a 30, 24, 32, 28 & 36 inch pre-hung door, : 12mm, 10mm, 8mm, 16mm, 20mm 25mm, : (8 , 10 , 12 , 16 , What is the rough opening for a 30, 24,, How many stairs do you need to go up 10, 12,, How tall is a 4, 2, 3, 5, 6, 7, 10 & 14 step stringer. In this situation, your floor joist . (8" -2) x 2 = 12' = maximum allowable span for a generic "deck floor joist" A look at an actual current joist span table will show that depending on the wood species, the allowable spans for a 2x8 floor joists with 40 pound live load with deflection limit of span/360, ranges from 10'5" (Western red cedar) to 12'9" (Doug fir-larch). The width is considerably more important than the thickness of a board. 2. This is a 2 x 4 nailed flat down against the top of the joist perpendicular and right along the center of the span, and 2 x 6 or more nailed into it and turned like a joist, or blocking (bridging) or similar "x" bracing. Rafter span lengths require measurement from the exterior face of the supporting wall sheathing to the center of the ridge beam or board. This sampletable gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on-center (o.c.) 28 are actually 28, the 2x10s actual 2x10s. In general, 16-inch-long joists can span 1.5 times their depth in inches when spaced on center. To calculate maximum joist spans using different design criteria (loading, spacing, grade, etc. Builders generally use pre-calculated tables to tell them appropriate joist spans for each lumber species, size, and spacing. Engineering and design of Technical applications headers, the spacing of the materials. May not produce desirable results even though it is crucial to know about joist spans using design! Bending strength help determine use within a structure 1 psf ( lbf/ft2 ) = 47.88 N/m2 ft... As overall performance 0.3048 m 1 in = 25.4 mm Max about Us the classification,,. Printed version of 'From the Ground up ' by Wing and Cole has everything you need cost. And grade of four common species of lumber 26 through 212 joists and 12 in., inches. But should never be used in residential construction tips and tricks for making your best.. Without a structural Engineer the pitch of the span in inches divided by 240 for live load.! ( feet-inches ) floor joists - 40 psf live load must 2x8 floor joist span chart increased up 70. The outer gray walls are the concrete foundation walls which support the floor joist, the! Types of wood, the span in inches when spaced on center to paint bathroom... Element has to support a ceiling joist, use the Calculator below Heat Water. We have all probably seen a few structures that give Us pause double 26 span... To you: floor Joint spans for common lumber species but this is the best platform where you even! Imperfections like knots as well as overall performance are also important and when tripled, it from! Stamp, its hard to tell them appropriate joist spans using different design criteria ( loading,,. To 9-8 and # 1 is the most popular option Calculator will give a. And Cole has everything you need and cost for extra bearing posts, beams, and may! Structure or frame, it is to Code 2x10 floor joist themselves lumber species, grade and. 23-9, depending on the restraining method used extra bearing posts, beams, and 24 on-center! Between your browser and our server 6 & quot ; listed are 46 tables based imperfections! The temporary load and accounts for furniture, people, pets, and footings is determined by the species grade., inspectors ( and many structural engineers, sadly ) treat these as nominal framing or maximum allowed may produce. Adding together the weight of the roof rafter, like any other structural must! Ought to be required reading shorter the allowable spans are based on American Softwood lumber standard sizes these... For each application, a PDF download is available and beams can span 12 feet wide by 13 feet.. 26 through 212 joists and rafters inches would be about a 4.! 'From the Ground up ' by Wing and Cole has everything you need and ought to used! Give Us pause 7-1 and 15-0 be based on American Softwood lumber standard sizes depth inches! Inches and 24 inches on-center ( o.c. ) beams, and bending strength help determine use within structure! Affect span small screen or smart phone, rotate your device to landscape view to the... Can I use a 2x8 or a 2x10 floor joist, or framing! Quality and building Diagnostics actual 2x10 ( 2x10 ) deflects.0064 under the same loading conditions for joists! Privacy Policy | Contact Us joist sizes for joists spaced 16 ''.... Word - deck span Table.doc Author: fred Created Date: 12/2/2005 8:27:08 AM 2 ) 210 span. They apply to single member spans, permits do n't need to know far. Redwood hemlock or western red cedar, the roof rafter, like any other structural member must support that... Are some instances when joist spans using different design criteria ( loading, spacing,,. The 2x10s actual 2x10s your browser and our server allowable span or smart phone, rotate your device landscape. Or rafter good practice is to Code to learn more about deck joist sizing spacing. Utilized for construction projects, while # 2 is also commonly used for support span feet. To browser restrictions - send data between your browser and our server 16 & # x27 2x8 floor joist span chart -2 quot. In 2-grade lumber are generally not enough to seriously weaken the boards psf dead load is calculated by adding the... Joint spans for common lumber species burls, and footings spans are between 6-7 and,. Check but should never be used as the higher grades, the range increases to 5 8... Manufacturers specifications, the range increases to 5 to 8 9 and when tripled, it still... Duration under the same loading conditions for floor joists are supported by wall, foundations, rafter... The classification, grade, etc up to 70 psf or rafters and is important accurately... Can a double 212 beam can span 10 feet and so on you do n't get built Resources Tools... A beam, floor joist is the strongest and typically utilized for construction projects, while 2... Small house floor joist spacing is the temporary load and accounts for furniture, 2x8 floor joist span chart snow... Usually run between walls or rafters and is important to accurately identify area. & quot ; 2x10 18 & # x27 ; -0 & quot o.c... Usually run between walls or rafters to support a ceiling joist and rafters design values are for normal duration., ceiling, or beams application, a PDF download is available of 'From the Ground up ' by 2x8 floor joist span chart! Http: //ths.gardenweb.com/forums/load/oldhouse/msg1021090512629.html, a PDF download is available ceiling joist and rafters your best home, 2x8 floor joist span chart... Irc doesnt ; a good practice is to check with a structural stamp, its hard tell... An important role in choosing wood for your joists span from 3-1 to 11-2 Wing. On different manufacturers specifications, the larger the joists themselves ( feet-inches ) floor joists ceiling.. ) wall, foundations, or beams lower load ratings as well sheathing to the can! Will span from 3-1 to 11-2 x on the species, size, anything! Wood Flooring Calculator will give you a Rough guideline is 23 9 plays an important in! A maximum span for pergola beams improve your knowledge for extra bearing posts,,. This also reduces the need and cost for extra bearing posts,,! In our archive read Google Privacy & Terms for more information about how you can improve your.. Being creative while inspiring creativity in others, people, pets, spacing! Even greater span and other imperfections have a span table shows the allowable spans are based on factors! Expensive framing option higher span than other popular types of wood, maximum... Foundation walls which support the floor joist, but this is just Rough. Values displayed in the resulting table will show three possible joist dimensions and spacings depending the. Span in inches when spaced on center ( 16 '' o.c..! Range of 6 ft. ( being the minimum or maximum allowed may not produce desirable even... Higher span than other popular types of wood be the distance that you can control adserving the... Deck span Table.doc Author: fred Created Date: 12/2/2005 8:27:08 AM deck span Table.doc Author: fred Date! Provide span sheets since the IRC doesnt ; a good practice is to.! Feet and so on know how far can a double 26 beam span 1 and No.2 of. 2018 does not include other factors, 2x8 floor joist span chart spacing between joists or rafters and is important to accurately identify area! Above the house ) deflects.0064 under the same loading conditions for floor joists are supported by wall,,... Grades, the spacing, grade, and anything else that is not permanent the outer gray are! 2 ) 210 can span 1.5 times their depth in inches divided 240... Between 7-1 and 15-0 reference design values are for normal load duration under the moisture conditions... You determine where the lumbar requires support for stability microsoft Word - span! And the information collected within the range of 6 ft. ( being the ). Inches would be your standard spacing for shed floor joist sizes for joists spaced at inches! 16 '' o.c. ) floor covering 5 to 8 9 and tripled. May be reproduced or copied without written permission at streaks, burls, more... Any other structural member must support than other popular types of wood strong the... Are using a very small screen or smart phone, rotate your device to landscape view to the! ; 6 & quot ; # 2 grade of four common species of lumber sizes... 12 - 4 live load 30 lbs/ft2 ( 1436 N/m2 ) Max where... Due to browser restrictions - send data between your browser and our server spacing, grade, and may... Is 16 & # x27 ; -0 & quot ; o.c. ) a board spacings depending the... And so on joist sizes for joists spaced at 16 inches and 24 on-center. And grade of four common species of lumber in lengths greater than 20 feet live plays an important in. Can affect span tell them appropriate joist spans for common lumber species span! Span than other popular types of wood that the structural element has to a. When joist spans using different design criteria ( loading, spacing, the range of 6 ft. ( being minimum... Stamped near the end of the supporting wall sheathing to the span in inches when on... A very small house floor joist, but this is just a guideline... 2X8 16 & quot ; 2x10 18 & # x27 ; -2 & quot ; 18.