how much weight can a 8x8 post hold

I hope that clears up the confusion. Have You Read My All-Time Most Popular Post? random_imglink() Yes, the posts on one side of the beam are sort of "floating" actually they are attached to the wall by a 2x4 "plate" at the bottom, and tied in with a sort of cross brace at the top. From the above list, we see Cedar falls into the lighter wood category. Thank you for the important information regarding buckling, and the importance of securing the posts in the centers. We use cookies on this site to enhance your user experience. For this job, I am sure that 6x6 posts would be very adequate, but for down the road I want to know what 8" and 10" logs will carry. It's next to impossible to pay for large graded timbers in all but the highest end work. This means that it has to have a moisture content below 19%. For instance, weight applied to a concentrated point on a block via a support column exhibits greater stress than weight spread over a wide area. The cost difference between the 6x6 and the 8x8 are minimal. As an Amazon Associate I earn small commissions from qualifying purchases through this website. If you're in Alaska (I'm assuming, Fairbanks?) The lumber weight calculator below will estimate the weight, specific gravity, and density of any species of wood. Question 16. How much weight can my deck support? stee6043 Minister of Fire Aug 22, 2008 2,648 West Michigan Jul 30, 2009 #7 What is it you're buidling? So the net weight an 8ft x16ft dock will support is 3,120 - 1344 = 1776 lbs. Here is a list of common snowmobile models and how much they weigh (dry weight estimate) - which ultimately contributes to the weight of your trailer: Polaris 600 RUSH PRO-S (432 lbs. The ultimate load is the defined by area of the roof carried by each post. Is the end attached to the floor? A well-built MDF shelf can hold between 50-80 pounds of weight. One thing to remember, wood type and moisture content will greatly affect these weight capacities. Find out what kind of steel it is, and google mild steel. For this job, I am sure that 6x6 posts would be very adequate, but for down the road I want to know what 8" and 10" logs will carry. Yeah I was looking for different ways to strengthen the top for winds but not to sure how to go about it. I figured kips was kilo something. Theoretically, increasing the span from 11 feet to 14 feet should increase the beam deflection by a factor of 2.5 for similar loading (not exactly the case here, as you're re-loading the beam more to mid-span). 49.02. Surely there are other factors involved besides purely area, too. What is the maximum span of a 66 beam? Left side are different so watch what you are getting. The Fora platform includes forum software by XenForo, https://courses.cit.cornell.edu/arch264/calculators/example7.1/index.html, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 6. Yes, for beams, the load capacity is inversely proportional to the cube of the span. (Straight 6x6's are difficult to find), We have reinforced the post. Load due to the weight of a mass - m - is mg Newton's - where g = 9.81 m/s2. 199. I think 6x6 word work fine but not look as nice. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Standard treated wood has about 0.06 lbs/cubic foot chemical retention while wood treated for ground contact has about 0.15 lbs/cubic foot. A well-glued wood joint can take roughly 3000-3500 PSI of load before they break. You can have as many as you wish How Much Weight Can a Wall Hold . Any professional carpenter will tell you the same thing. A piece of wood can carry so much weight per square inch of footprint. For my "roof", for lack of a better term, which will be 42' long by 12' wide, I will use the aspen logs as columns to support a 42' beam (4 logs under a 42' beam). Disco: Thanks. Overall, there are several factors to consider when thinking about how much weight a deck holds. Seems you've got a pretty good idea what you're up to. Now since we got the structural issues aside but if anyone thinks of anything else please do let me know What do you guys think of a black or maroon metal roof? Are you planning to apply your own safety factor or are you really looking for the maximum allowable load capacity? I don't know where you are located but around here the 8x8 PT posts are located next to the 6x6 PT posts in all three building supply stores. Our Christmas Shutdown is from December 22, 2022 - January 2, 2023. How Much Weight Can A 24 Hold? The maximum span for roof rafters is 23' 9". This product is green (wet) and is best suited for outdoor applications. Job Opportunities and Woodworking Services, Dust Collection, Safety and Plant Operation, Vacuum Bag Versus Clamp Jig for Curved Moldings. Cutting a span into pieces, though a PITA to walk around a post or two, is sometimes all you can practically do. This allows the even distribution of weight through the legs. The wall is studded with 2x4 is placing a 4X8 under it "the wrong way" going to cause problems with the weight not being distributed properly on the top of the post? Which could possibly be a code issue as you would need a current deflection of L/900 to end up above L/360. Typically, a deck can hold a minimum of 50 pounds per square foot. john. The side beam allowable download is 1,170 lb. JavaScript is disabled. myimages2[2]="../../../images/top-banner/behindtheforum.jpg" Assuming a 6ft length of 4x4 that actually measures 3.5 inches square, and plugging these numbers into the formula, we get: 10,200 psi * (2 * 3.5in * 3.5in^2) / (3 * 72in) = 4049.306 pounds This appears to be the point at which your beam will deform. For hemlock/fir beams, this document from the school of architecture at the University of Maryland states that in compressive loads, parallel to the grain, a 6x6 post 10 feet in length, can support 4400 lbs. In general, thicker walls will be able to hold more weight than . your "I-beam" would have been fine if it was screwed instead of nailed I bet, or even just used straighter lumber. Its not the best for heavy-duty load-bearing but it is durable and great for lightweight work. Glued and screwed) That is stronger than a 4x4. But you need to add up the loads based on values that go with your allowable stress. I'm in mid-Michigan and code is 42" deep. Let's change that area of 2 square feet into inches. The higher your deck is off the ground, however, the less weight per square foot it can take. It is roughly 4,300 LBS for the entire post. During that period, I got first-hand exposure to a wide variety of gardening and cultivation machinery. If you choose pressure treated lumber, take note that 85% of pressure treated lumber sold in the US is southern yellow pine, so that is probably what you have. Default is 50 psf which you can change. You can have as many as you wish I was originally going to go with 8" posts but they are hard to come by. Are you planning on building a fence? I don't see that as particularly odd, but maybe 10' is pushing it???? If a couple of lags and screws make you feel better, GO FOR IT. The actual dock will weight by itself 10.5 pounds per square foot. I'm guessing that you'll have close to 600# in the 12'x12' dock with the gangplank resting on it, not including the weight of the hardware and drums. I'm concerned that a 4x4" would not provide enough load-bearing capacity, but I have no engineering background. Allowable wood stress in compression parallel to grain is 850 PSI. This advertisement will close in seconds. To calculate other wood weights and volumes, check out: Just a heads up, this page contains affiliate links. As written, this question is unanswerable. 12000 divided by 1/6 is 72,000 psi. This is a crucial detail for a wooden structure to be practical and safe to use. Over 200+ free JavaScripts here! Using the same example 8ft x 16ft x 10.5lbs = 1344 pounds. Assuming #2 grade, the. This calculator determines the size of each tributary area of your deck. What method are you using to connect the beams where they meet at each corner? 3. If your 22 is 12 feet long, multiply 12 by 0.44 to get 5.28 pounds. For example, 4 x 6 lumber is not on the list, but you can simply choose 2 x 6 and double the value. Stop agonizing over it and add a mid-span post. 3.5inX3.5inX500psi=6125 pounds per contact zone (round down to 6000) So: 2X2 box crib = 24,000 Lb. To my astonishment, this one and a half decades of association with the said field has made me acutely interested in this sector. I'm an agricultural engineer with more than 15 years of experience. Close this window and log in. var ry=Math.floor(Math.random()*myimages.length) per square foot for northern areas of the U.S. For rooms which are heavily frequented, it may be 50 lbs. kips = 1000 pounds. Is the load centric? So I'm wondering if 6x6 would hold up the roof since they are only $30 each and the simpson strong ties are available. Bolt diameter None indicates full cross-section. Z-section steel is usually used in large steel structure plants. And a 10-foot-long 26 pressure treated board will weigh around 40 pounds right after being treated. Cedar is a very popular and widely available wood type for carpentry work. MDF is a lightweight composite material in the world of carpentry. Run 2x6 or 2x8 on edge like a header to join your legs. The capacity of a 12' tall 6x6 post varies greatly as described above. What Size Nail Gun For Fence Pickets - Choose The Right One. In general, the strength of wood depends not only on the thickness but also on type, moisture content, and grain direction. But first, generally, how far can a 28 span without support? 3. Live Load So you want steel that can handle at least 72,000 psi. Yes, the 36" footer should raise flags, and code here is also 42" (to the top of the footer). 18', 20', 22', 24'. My first question based on your new description would be - are you sure about 36" deep footers? Then you show a "2x10x12 double" as the outside beam. Certainly, 6x6s would work fine, but then I'd have to buy them; logs a free. sort of. if I ignore my labor. if (ry==0) However, if the post is a stronger grade, the strength goes up quite dramatically. The calculation method is different according to the force mode: 1) Tension action 2) Shear force action 3) Bending moment action 4) Torsion 5) Multiple load combination action Finding the stress and deflection deformation is mainly related to the parameter properties of the load and the section, and then find the formula and set the formula. 1. I'll be putting 4 posts along the length, each side, and running a beam on top. KD-19 (Kiln Dried 19%) lumber will have an average moisture content somewhere around 15%. Wood glue or white adhesives are a fairly strong joiner. 10 Reply Sgt_carbonero 2 yr. ago var imagelinks2=new Array() To calculate the load, you should use 40lbs per square foot for live loads (these are variable loads that are dynamic such as the weight of people and furniture) and 15 lbs per square foot for dead loads (this is the weight of the materials used for the construction of the deck) for a total load weight of 55 lbs per square foot. var myimages2=new Array() People have been using wood as construction materials for thousands of years. Serving North Marin & West Sonoma Counties in the San Francisco North Bay area of Northern California. Posts are held to concrete footings with metal brackets, they are further supported 3' up by the floor framing and then again by the roof structure. The load capacity of a 3-foot #2 grade 44 is 17,426 pounds, and a similar 66 is 20,834 pounds or 16% better. To fix the weak link, add more strength or change the material. Capacities are per post/column and allow for a safety factor of 5. myimages2[1]="../../../images/top-banner/behindtheforum.jpg" I am building a supplies loft that is 24' x 24'. Updated: 00/04/25 Random Image Link Script- By JavaScript Kit(http://www.javascriptkit.com) WOODWEB is a registered trademark of Woodweb.com. As has been mentioned, there is simply no way an 8x8 is going to carry 20', even carrying its own weight.