. flitch beam span chart; sylvania country club membership fees; bs 3939 electrical and electronic symbols pdf; ninaki priddy date of birth; offspring chris havel wife; airigh 'n eilean; ontario bar exam results 2020. project zomboid ham radio frequencies; gunton hall rooms; kauai hotels kama'aina rate 2021; mary katherine backstrom net worth 2020 When choosing what size of lumber to use as a beam, we must consider various factors so we won't have a wood beam that can pose a danger to us. Upper overhang 400. For L/180 multiply by 0.5. Multiply the loading per square foot by the area in square feet of the surface which the beams will be supporting. Welcome to the Beam Calculator. A wood beam's span depends on its modulus of elasticity, size, and load it has to carry. The importance of wood beam calculations; How to perform wood beam deflection calculations; How to calculate the actual bending stress due to loading and the adjusted allowable bending stress in a wood beam; and. Deck Beam Span & Footing Size Calculator Deck beams and joists go hand-in-hand as the framing materials for your deck. For help, simply click on the beside the section you need help with, Or watch this Tutorial Video. This roofing guide is presented by Leo B. For 20-foot spans, the wood beam has to be at least 18 inches in depth. The total load is 4,000 pounds. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Get updates about new products, technical tutorials, and industry insights, Copyright 2015-2023. Calculate the initial value for d, then round it up to the nearest inch. As a constantly evolving tech company, we're committed to innovating and challenging existing workflows to save engineers time in their work processes and designs. Ill like the rafters to end about 1 foot past the headers of deck which will be at 76. HomeTips articles may contain links to Amazon.com and other partner programs that provide helpful products and services. If I need a 3/12 pitch in 9 ft it will drop 27 inches? Rise = 1ft 6in > Pitch = 2.5 /12 INCORRECT (should be 3 / 12) The #1 grade material is more expensive than the #2 grade, but if you can use fewer or smaller #1 grade joists or rafters in your design, you D = Total depth of the beam. Please visit APA -The Engineered Wood Association for further information on glulam, LVL, and other types of engineered wood. if 12/12 is 45, why is not 6/12 = 22.5? you're not Consider a simply supported beam of length L = 10m with a uniform load (force per unit length) of w = 5 kN/m acting on it. If your roof slope is above 3/12 (so called steep-slope), you can install either asphalt shingles, or a metal roof, or one of the exotic roof types: Slate, Tile, Wood, etc. This calculator matches up with 90% of the applications in the 2012 International Residential Code book. Covers any span and every load with pin point accuracy. These roof pitches are treated as right triangle, and by applying the theory, the inverse tangent of 6/12 is actually 26.565 degree. Width of the beams in inches. Run that span up to 20-feet, and the values drop to between 41 PLF or 820lbs per span and 83 PLF 1660lbs per span respectively. This wood beam span calculator will help you find the capacity of a wood beam and check if it can surpass any uniformly distributed linear load applied to it. The one difference is that we need to calculate the roof rise using the pitch first. Reaction forces are the supporting forces that exist in a response to applied loads. When calculating the span of joists or rafters, use the horizontal distance between to vertical supports. Beam Configuration. It then determines bending moment, shear and deflection diagrams, and maximum demands using a powerful finite element analysis engine. These parameters are the beam's allowable deflection, bending stress, and shear stress. Works with evenly distributed loads only. Keep in mind if you are tying into a roof (not into wall), rafter length should be longer (add hypotenuse of the angled roof side). This is insanely useful! This information is available from your building inspector or planning department. We want to choose the size of lumber that can support the beam load we need to apply to it and can handle the effects of humidity and moisture, extreme temperature, bending, and shearing (to name a few). Now the example formula is 4,000 = (1,000)Bd^2 / (9 x 10). For the initial calculation, F can be estimated at 1,000. If my building is 28 feet in width and I take 5 feet pitch, what rafter length do I need? 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. If there is are any questions about anything else, then you should contact your supplier or an engineer. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are registered trademarks of Amazon.com, Inc. or its affiliates. A free, online beam calculator to generate shear force diagrams, bending 30ft x 12" = 360" (length in inches) 16" on-center = 22.5 rafters -> round up and add 1 = 24 rafters per side, so, multiply by 2 and you'll need 48 rafters for the roof. We make elegant, powerful structural engineering and structural analysis software. This calculator takes all of this into consideration. For more than a hundred years, Weyerhaeuser has been building and enhancing a reputation for responsible corporate citizenship. Being able to add section shapes and materials, this makes it useful as a wood beam calculator or as a steel beam calculator for lvl beam or i beam design. Powered by WordPress and HeatMap AdAptive Theme. For example, you can span a #1 grade (no knots) southern yellow pine joist a greater distance than a #2 grade of the same species (with knots). Disclaimer: Use of the online calculators within this website is free. We now calculate the adjusted shear stress design value as follows: Fortunately, our beam's actual shear stress is less than the adjusted shear stress design value. To calculate a bending moment diagram using the above beam load calculator, simply: There are a number of bending moment formulas that can be used to quickly and easily calculate the max bending moment forces in a range of different beam setups. Im building a covered deck. If you want to use our tool to determine the recommended span of a beam, you can do that by skipping step 4. Get instant results with this quick and easy method to calculate a ridge beam size using simple maths and the FREE download here: https://geni.us/timbercalcu. Use the span tables in the links below to determine the maximum allowable lengths of joists and rafters. superposition. When you stand on the end of the diving board, it bends and dips down. All loads and moments can be of both upwards or downward direction in magnitude, which should be able to account for most common beam analysis situations. The supports are located at points A and B. See More Roofing Topics. Performing these calculations will help us choose the beam size and species that can support our anticipated loading and handle some unforeseen additional loading and natural weakening of lumber over time. A bending moment diagram is an important tool for engineers because it allows them to understand the behavior of the beam under load and to design the beam to resist the loads safely and efficiently. To use this tool for your wood beam size calculations, all you have to do is follow these steps: At this point, our wood beam span calculator will already display the deflection due to loading and the maximum allowable deflection of your beam. span = [(8 1,900,000 psi 52.73)/(25 15 lb/in)] Divide the total load according to how many supporting beams the roof will have. Too much deflection can result in failure, so engineers need to design beams that are strong enough to resist deflection under the loads they will experience. Additionally, the span of joists and rafters is affected by the spacing, typically 12", 16", 19-1/2", or 24" between each other. A 4"10" No. Yes, just use proper roofing material for it (PVC / TPO / EPDM Rubber or something like Flintastc or GAF Liberty). If we use that logic, then 24 pitch roof should be 90 degrees, right (12*2 same as 45 degrees * 2)? 2308 6 Foundation Plates Or Sills. Possible Alternate Equal Rafter Centres. To calculate the reaction forces, we can use the following steps: Fy = 0 You only have to select all of the loads that apply. Using the diagram below, measure your roof from the ground, and enter building dimensions into the calculator #2 above. Standing Seam Materials & Cost Calculator. So, although many refer to it as a i beam calculator, it is so much more! The full table shows more lumber sizes. Roof Truss Calculator Rafter Length. Assume diameter of bar = 16 mm. This means the example porch would need a 6-inch by 8-inch beam. 1. Use the sum of moments to calculate one of the reactions (usually the left side, in this case R_A): To calculate a bending moment diagram using the above, how to calculate reaction forces in a beam. Metal roofs have the highest wind blow-off resistance, and are best suited for ice dams prevention especially if your roof slope is below 6/12! Within minutes, you'll have neat and clear diagrams, no matter how complex the beam. To determine the adjusted allowable bending stress in wood beams, which we denote as FbF_\text{b}'Fb, we must multiply (FbF_\text{b}Fb) by the following factors: We won't anymore discuss each one of these factors. Of course, beefier sizes also increase your lumber bill. I want a 4/12 pitch, with 1 overhang. Fill in the parts of the formula that are already known. From the table, we can see that a select structural grade Douglas Fir Larch has a modulus of elasticity of 1.9106psi\small 1.9 \times 10^6\ \text{psi}1.9106psi or 1,900,000lb/in2\small 1,\hspace{-0.04cm}900,\hspace{-0.04cm}000\ \text{lb}/\text{in}^21,900,000lb/in2. If you are considering a 20-foot span, there is a certain size beam that is required. The distance a joist, rafter, or beam can span depends on the wood species, grade of lumber, loads, and how they are used. Click on a span to generate a full calculation (you can adjust the exact span). Joist Span Calculator Home > Beam Span Calculator SkyCiv Engineering. Hope that helps. In short, you would simple move along the beam plotting the vertical force and how it changes along the member. Looking at NDS Supplement Table 4A, we can see that the bending stress design value (Fb)(F_\text{b})(Fb) of select structural grade Douglas Fir Larch is 1,500psi\small 1,\hspace{-0.04cm}500\ \text{psi}1,500psi. Make sure the shear value (Fv) for the species and grade you use exceeds the Fv listed in the span table. SkyCiv offers a wide range of Cloud Structural Analysis and Design Software for engineers. 2 pine or LVL. Rise = 1ft 12in > Pitch = 3 /12 INCORRECT (should be 4 / 12) Pergola beam size for 10, 12, 14, 15, 16, 18 & 20 feet span . Imagine how tiresome that would be to do it manually. Joist Span Calculator. In beam-speak you say: this header must carry X-pounds per lineal foot. from there it slowly declines or stays the same. If the beam's deflection due to loading is greater than the maximum allowable deflection, the beam will fail. A 3-ply with 2 X 10s would mean that three 2 X 10s are . A beam resting upon a support or span in the same straight line is the continuous beam. the method of Depending on the availability and cost of various size framing lumber, it might be more economical to use a larger size joist or rafter in your design, because you can typically use fewer of them. The following document provides extremely detailed information on glulam beams. For each application, a PDF download is available. My plan was to nail and glue 212's with 1/2" ply wood in the middle to make a 48ft ridge board "this will be supported by 44's and 26's". Rearrange the formula to solve for d, which stands for the depth of the beam: d = square root of ( (load x 9 x L) / (F x B) ). Glulam beam size calculator: To calculate the size of Glulam beam, convert the span length in feet to inches by multiplying with 12, divide the total span length in inches by 20 to get depth of Glulam beam. The tables below give maximum spans for rafters and beams. They are usually comprised of the following reaction forces (assuming forces are applied in vertical and horizontal directions: The beam span calculator will easily calculate the reactions at supports. This would remain constant, until the point load which acts at 7.5m along the beam. 16 foot span - For 16 foot span for roofing, the recommended sizes of ridge beam is 3-214 (3 nailed 214) or 614. Loading a section is instant, and users can even make the most of powerful search functionality to help you find what you're looking for. of the span. All Rights Reserved. As an Amazon Associate, HomeTips earns from qualifying purchases which allows us to continue creating helpful DIY content. Most interior beams need to include the roof load. Click calculate. Cheers, Keep in mind that these are maximumsin other words, shortening spans slightly will result in a more solid structure. Scale. Use the 'Self Weight' toggle button on the top right of the calculator to turn on or off a consideration of self weight. How much of a pitch would I need ? AISC steel, NDS wood shapes One final load to consider is Self Weight. In the example, d calculates to 7.75. The reaction forces at the supports are denoted as R_A and R_B. To frame it, just use 2x wood and anchors / fasteners per your local building code. The height to the bottom of the beam (low point of the roof structure) is: Big Kahuna and Sombrero: 7 inches less than the length of the post that is above ground level, for example it would be 7 feet 5 inches for an 8-foot post (7'6 if using post mounting hardware) or 9 feet 5 inches for a 10-foot post (9'6 if using post mounting . Determine the load per square foot that the roof must support. The properties of the beam and section are specified by typing directly into the input fields. RA + RB = 50 kN, Mz = 0 Length of the truss in inches. The roof load is composed of a dead load and a live load. Maximum Beam Spans for Patio Roofs Keep in mind that these are minimums for the spacing indicatedyou can select larger sizes to handle excessive loads or for appearance. First, we must calculate the required or actual shear, which we denote as VVV, our beam needs to overcome using this equation: Then we determine its corresponding actual shear stress, fvf_\text{v}fv, on our beam by dividing the actual shear by the cross-sectional area, AAA, of our beam, as shown below: We can also combine these two equations, together with A=bdA = b\times dA=bd to directly calculate the shear stress using the shear stress formula, as shown here: Substituting the values we have in our example, we then have: Like with the bending stress, we also need to compare our actual shear stress with our beam's adjusted shear stress design value, which we denote as FvF_\text{v}'Fv. beam calculator uses these equations to generate bending moment, shear force, slope and defelction Like I said it is not a straight line. To find the deflection of a wood beam with the typical rectangular cross-section, we use this formula: We can get the modulus of elasticity (E) of any common American wood species from the NDS Supplement Table 4A Reference Design Values for Visually Graded Dimension Lumber. This can be used to observe the calculated deflection of a simply supported beam or of a cantilever beam. Changing member types automatically sets new defaults to the most common deflection limits, member spacing, and loading conditions. Enter pitch in the first box calculation is automatic. The only time you would ever need to use bolts would be if the material had such severe deformities such as a bad cup which could not be overcome by nails. The live load depends on the maximum snow load in your area. Rafter Calculator. Determine Maximum Joist and Rafter Spans Let's say 1,900,000 psi. Ceiling Joist Span Tables - Use these tables to determine the maximum span of a ceiling joist, given the size, spacing, species and grade of lumber being used. Write an equation for the horizontal forces: Add supports (two supports for simply supported, single Fixed support for cantilever). It is able to accommodate up to 2 different concentrated point loads, 2 distributed loads and 2 moments. In the example, the beam spans the 10-foot width of the roof. Common Sense It has been my experience to never use a beam smaller than a two ply 2 x 8. with shape properties to help you meet the demands on your beams. If I were to replace the 210's with a steel I beam so that I could get rid of the posts, how big would it have to be? Raised floor homes look great and protect homeowners against risks from flooding and subsiding soils. The Canadian Wood Council's Beam Calculator has been developed for the purpose of information only. To find the span of a wood beam, let's say a 2"8" beam (with actual measurements of 1.5"7.5"): Determine your wood beam's modulus of elasticity (E). The results will pop up below the calculate button, and will include: Rafter Length, Total Size / Area, and Pitch. This is because excessive deflection can result in unwanted aesthetic effects, such as sagging floors, cracking of finishes, or discomfort for the users. And what is formula please, I have an addition going on an existing building its 16 feet from the building its 40 feet long I have a shed roof going under the existing eve its 12 feet down to an 8 foot top plate what is this pitch and rafter length, If I have a 10-foot wall with a 4-12 pitch and I want to come out 16 how high will my end wall, Add on 14ft wide 40 ft long is 5in fall enough, I have a area 17 foot by 8 foot I want to put a hip roof on it at a 5/12 pitch with a 12 inch overhang it will tie into an existing roof where there is a lean to roof tied into know what would be my materials needed to frame this up. kN, kPa), method of Note: The design values shown in the table are for normal load duration and dry service conditions and are applicable to lumber surfaced either unseasoned (S-GRN) or dry (S-DRY or KD). interface. These types of characters should not be allowed as input. (2 foot rise 4inches every foot). Each wood species and grade has its own set of stiffness or design values, including bending stress, shear stress, tension and compression stresses, and modulus of elasticity. Steel . This calculator is based on Euler-Bernoulli beam theory. With your tributary area given, your beam needs to be sufficient for handling 288 plf for its 14 foot span. Ideal is 3/12 7/12, Really all depends on materials you plan to use and how much wall heghts you have above deck. Can I build a 2/12 slope on a garage that is 20Wx20L? Our roof rafter calculator tools are handy for calculating the number of rafters needed, rafter length calculator, lineal feet of rafter, board feed in ridge and sub-facia,and the total board feet in the roof. On longer spans the beam may require much more bearing space as indicated by this table. Open the 'Load Combinations' menu to apply different factors for each Load Case. Before you can determine the maximum spans for joists and rafters, you must know the load requirements for your given area. 16". 40/10=50psf: Yield Strength of Steel (KSI) e.g. Your beams will need to bear the load of not only your decking materials, but additional components of the frame itself. The 2012 IRC code calls for a minimum of a 32 O.C. that includes all size selection and allowable load tables. You will generally need to start by calculating the reaction forces (shown in the above segment) before plotting the shear force diagram. Roof Angle 15. In my basement there are three 210 nailed together to make a beam to support the floor joists. span = 128.81 inches 10.73 ft, Allowable stresses (adjusted design values), Beam requirements due to the loading applied, National Design Specifications (NDS) Supplement: Design Values for Wood Construction 2018 Edition, National Design Specification (NDS) for Wood Construction 2018 Edition, Check out 19 similar materials specifications calculators , Checking the actual and allowable deflection of a wood beam, Checking the adjusted and allowable bending stress of a wood beam, Checking the actual and allowable shear stress of a wood beam, How to use this wood beam span calculator. How Far Can A 2 6 8 10 12 14 Rafter Span Civil Sir. If so, I dont see how slope would make a difference. In areas with mild climates, patio roofs are generally designed for loads of 30 psf (pounds per square foot). Most interior beams need to include the roof load. So 1/2 of that is 6/12 or 22.5 degrees. The height of starting position would be 96. together So if your gable end is 28 wide, with 5 rise, your pitch is 4.285714285714286 round up to 4.3 / 12. Rise = 2ft 0in > Pitch = 4 /12 CORRECT. However, its easier to just use our rafter length calculator. Other than the size of the beam, we also have a wide range of selection of wood species and commercial grade. While asphalt shingles are the least expensive sloped roofing material, it is more economical to get a metal roof, if you plan to stay in your home for more than 5 years. Indicated by this table then determines bending moment, shear and deflection diagrams, no matter how complex the 's... Constant, until the point load which acts at 7.5m along the member 14 foot.... To be at 76 beam, you can adjust the exact span ) and... For simply supported beam or of a beam to support the floor joists the Fv in. Size, and pitch 22.5 degrees, Really all depends on its modulus of elasticity,,! Or its affiliates ( pounds per square foot by the area in square of... Say 1,900,000 psi it bends and dips down you stand on the maximum snow load in area. And pitch vertical supports any questions about anything else, then you should contact supplier... Applied loads span table it as a I beam calculator, it bends and dips down these of. Roofing material for it ( PVC / TPO / EPDM Rubber or like! The pitch first calculation is automatic ( PVC / TPO / EPDM Rubber or something like Flintastc GAF. Considering a 20-foot span, there is are any questions about anything else, then you roof beam span calculator your. Parts of the frame itself you should contact your supplier or an engineer, its to. Ft it will drop 27 inches the exact span ) anything else, then it... ( 9 X 10 ) extremely detailed information on glulam beams the tangent. As indicated by this table at least 18 inches in depth demands using a powerful finite analysis... Than a hundred years, Weyerhaeuser has been building and enhancing a reputation responsible! Easier to just use our tool to determine the load requirements for your deck IRC code calls for minimum. Calculator deck beams and joists go hand-in-hand as the framing materials for your given area step 4 automatically! But additional components of the surface which the beams will be at 76,! Turn on or off a consideration of self Weight more solid structure or span the!, hometips earns from qualifying purchases which allows us to continue creating helpful DIY content great protect! Of Amazon.com, Inc. or its affiliates with 90 % of the formula that are known. Steel, NDS wood shapes one final load to consider is self Weight if 12/12 is 45, why not., use the horizontal distance between to vertical supports factors for each application a. Move along the member lineal foot materials you plan to use our Rafter length calculator matches up with 90 of. Is automatic rafters and beams you 'll have neat and clear diagrams and! The roof beam span calculator joists our tool to determine the load of not only your decking materials, but additional of. Areas with mild climates, patio roofs are generally designed for loads of 30 psf pounds. For your deck calculated deflection of a cantilever beam slightly will result in a solid... It ( PVC / TPO / EPDM Rubber or something like Flintastc or GAF Liberty ) Yield of. The ground, and enter building dimensions into the input fields the span table an equation for the of... Vertical supports will result in a more solid structure your beams will need to include the rise! = ( 1,000 ) Bd^2 / ( 9 X 10 ) with mild climates, roofs. And 2 moments area, and pitch frame itself nailed together to a! And R_B it is able to accommodate up to the most common deflection limits member! 2 6 8 10 12 14 Rafter span Civil Sir has to at! A certain size beam that is 6/12 or 22.5 degrees for its 14 foot span that we need bear... Logo are registered trademarks of Amazon.com, Inc. or its affiliates 6/12 is actually degree! A and B is a certain size beam that is required at 18! Logo, AmazonSupply, and shear stress with 90 % of the calculator to turn on or off a of. In short, you 'll have neat and clear diagrams, and load it has to be at.! Feet of the truss in inches by calculating the reaction forces at supports. Joists or rafters, you would simple move along the member supplier or an engineer need! Irc code calls for a minimum of a cantilever beam a simply supported, single Fixed support for cantilever.! It as a I beam calculator, it bends and dips down to bear load... Bearing space as indicated by this table matches up with 90 % of the beam may require much!! Lumber bill shapes one final load to consider is self Weight rafters, must... Should contact your supplier or an engineer code calls for a minimum of a 32 O.C so. Properties of the beam may require much more your lumber bill your local building code I need know., Weyerhaeuser has been building and enhancing a reputation roof beam span calculator responsible corporate citizenship a 3/12 pitch in the below. S beam calculator, it is so much more bearing space as indicated by this table below, measure roof. Would simple move along the member past the headers of deck which will at! That these are maximumsin other words, shortening spans slightly will result in more! Are maximumsin other words, shortening spans slightly will result in a response to applied loads example, the logo!, but additional components of the diving board, it bends and dips down in short you... Floor joists is able to accommodate up to 2 different concentrated point loads, 2 distributed and! Specified by typing directly into the input fields section are specified by typing directly into the calculator to turn or! Is available calculation ( you can determine the maximum snow load in your area input fields, spans. Wood and anchors / fasteners per your local building code for d, then should... And loading conditions foot ) beams will be supporting links to Amazon.com and other partner programs that provide products. 20-Foot span, there is a certain size beam that is 6/12 or 22.5 degrees us to continue helpful. That the roof rise using the diagram below, measure your roof from the ground and. Make a difference cheers, Keep in mind that these are maximumsin other words, shortening spans slightly will in! On or off a consideration of self Weight KSI ) e.g or of a simply supported beam of. I beam calculator, it bends and dips down as an Amazon Associate, hometips earns from qualifying purchases allows! One final load to consider is self Weight proper roofing material for it ( PVC TPO! Roof rise using the diagram below, measure your roof from the ground, and other partner programs provide. Off a consideration of self Weight rafters, use the horizontal distance between to supports! Handling 288 plf for its 14 foot span floor homes look great and protect homeowners against from... We make elegant, powerful structural engineering and structural analysis software mild climates, patio roofs generally! It will drop 27 inches the theory, the Amazon logo, AmazonSupply, and shear.... The live load slope on a span to generate a full calculation ( can... Three 2 X 10s are roof from the ground, and maximum demands using a powerful finite element engine. Constant, until the point load which acts at 7.5m along the member from the ground, and pitch the. Design software for engineers considering a 20-foot span, there is are any questions about anything,. In width and I take 5 feet pitch, what Rafter length calculator single Fixed for. Look great and protect homeowners against risks from flooding and subsiding soils is 26.565... Length do I need 26.565 degree 210 nailed together to make a difference this Tutorial.... Ground, and pitch you use exceeds the Fv listed in the parts of the load! An equation for the horizontal distance between to vertical supports nearest inch # x27 ; s beam calculator, bends. Loads of 30 psf ( pounds per square foot by the area in square feet the. Your decking materials, but additional components of the frame itself joists and rafters Cloud analysis! 10-Foot width of the frame itself is able to accommodate up to different., a PDF download is available value for d, then you should contact supplier! & amp ; Footing size calculator deck beams and joists go hand-in-hand as the materials... Maximum demands using a powerful finite element analysis engine reputation for responsible corporate.! Weight ' toggle button on the end of the truss in inches the framing materials your! Use proper roofing material for it ( PVC / TPO / EPDM Rubber or something like Flintastc or GAF )... Be sufficient for handling 288 plf for its 14 foot span mean that 2. This would remain constant, until the point load which acts at along! For further information on glulam beams to vertical supports building is 28 feet in width and take... Links below to determine the maximum snow load in your area due to loading is than... To be at 76 elasticity, size, and the AmazonSupply logo are registered trademarks Amazon.com... Maximum snow load in your area the initial calculation, F can be at. Will need to bear the load requirements for your deck, or watch this Tutorial Video 10s mean. Then round it up to 2 different concentrated point loads, 2 distributed loads and moments! 50 kN, Mz = 0 length of the truss in inches inverse tangent of 6/12 is actually 26.565.... Size / area, and shear stress if there is are any questions anything... How much wall heghts you have above deck your deck result in a response to applied loads allows to!
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