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how much weight can a 2x8 support flat

Favorite Answer. Most cities in their building codes are now using what is called a “wet service load.” Since, obviously, deck materials are generally outside, you have to calculate the load values based on the wet use of the treated lumber that is used. More recently, after starting his own business in IT, he helped organize an online community for which he wrote and edited articles as managing editor, business and economics. How close together you place the joists also plays a role. 1000/32 = 31.25 LBS/FT^2. Multiply the maximum bending moment of 900 foot pounds by 12 to get 10,800 inch-pounds. To support 50 lbs., first consider that 40 lbs. People, who want to know how much weight can a 4×4 beam support, be it on the backyard swing set or the deck with a hot tub in it, worry not because we have got the answers for you. By knowing this, you can differentiate yourself from box stores or other competitors, and you can convert this knowledge into sales because you’ll establish yourself as the dealer in the market that consistently supplies the right materials and the right answers. The same wall runs perpendicular to the joists on all 3 floors, but not the basement. 9 years ago. Of course, there are regional factors at play as well. Click here to continue to the latest LBM news. So, you have to put this together as an entire package and find out why the customers are asking the question. Dose anyone know how I can find out what the load a 2x8 can carry? © Copyright 2020 LBM Journal, All Rights Reserved. He holds a Bachelor of Science degree from McGill University. Calculate the beam's section modulus by dividing the maximum bending moment by the allowable fiber stress for wooden beams. 1, that is kiln dried. per square foot. Can your office floor handle the addition of a large filing system? Where I live and work, in the Minneapolis area, we need to build decks to support 50 lbs. The theoretical calculation also usually assumes an even distribution of weight and that the ends of the beams are not only supported but held rigid. For example, a properly designed office floor can support 50 pounds per square foot. Get our email newsletter with LBM industry trends, data, new products, and best practices. Divide 10,800 inch-pounds by 1,150 pounds per square inch to get the section modulus required of 9.4 cubic inches. irc 2003 #2 y.p. It’s how much weight can the soil hold, the footings, fasteners, joist hangars, etc., and how much can it hold while it’s wet. How Much Weight Can a Floor Support? A good 2x8 will support as much as a 4x6. per square foot. For a beam spanning a 12-foot room and supporting a weight of 600 lbs., the maximum bending moment would be 12 x 600/8 = 900 foot-pounds. This would distribute the weight over a big area…\ 800/32 = 25 LBS/FT^2. It’s possible that it could hold much more weight than 50 lbs. This is much below the 50 LBS/FT^2 load designed in most homes. Multiply the loading per square foot by the area in square feet of the surface which the beams will be supporting. irc 2003 #3 y.p. Many customers nowadays are looking at adding a hot tub to their deck, or an outdoor kitchen space complete with appliances. Two 2-by-4 beams together would not be enough. That's because any analysis of what load a structure may bear upon itself and its foundation must involve the support post network and soil bearing capacity. 750 lbs. Don. This may seem light, but this is 50 pounds over each and every square foot of … The Entire Deck, Footings And Soil Are A System. … I have heard they don't bear much weight at all, and also heard they're almost as reliable as the 2x10s. 4×4 Beam Strength. You also have to factor in joist hangers, fasteners, footings, and soil. Putting a hot tub on the deck and want to know how much weight the 2x8s can bear. Dude!! Calculate the maximum bending moment for the wooden beams. Calculate the weight the beam must support. Step … To address possible imperfections and weak spots in the wooden beams, it is common to install the required cross section by placing several smaller beams side by side. or 54 lbs per sq ft. Would like to know if I'm ok or in trouble. You can make your joists able to hold thousands of pounds of weight and your footings could sink into the ground. At The Deck Store, we sell Southern yellow pine, grade No. You can’t build a deck that is going to have so much weight on it that the fasteners and hangers can’t support that load, or the beam that you will put in place or even the footings underneath it. irc 2003 #2 y.p. From Professor Gene Wengert, forum technical advisor: The grain direction (flat or vertical) has essentially no effect on the strength. Continuous and Point Loads - Support loads, stress and deflections ; Board Feet Chart and Calculator - Board feet - volume measurement of lumber; The best thing you can do is to consult your local building codes and utilize resources available to you such as NADRA. This is a common question asked by facility managers when contemplating a new file system or a heavy equipment addition. I'm trying to figure out whether this is a load bearing wall. We build decks to what is considered the “allowable amount of deflection.” That is a minimum standard that all reputable deck builders adhere to. The right answer is, of course, “that depends.” And it depends on quite a lot of variables. For a flat roof with snow loading, this is 25 lbs. 2x8 21'-8" 2x10 25'-7" 24" o.c. Calculate the weight the beam must support. 750 lbs. irc 2003 #3 y.p. A two 2-by-6 standard beam has actual dimensions of 1.5-by-5.5 inches which would give a section modulus of 1.5 x 5.5 x 5.5 / 6 = 7.6 which is not enough for this example. The tub filled with water weighs approx. For instance, if you’re going to build a deck with cedar joists, that load bearing capacity is far less than if you build it with Ponderosa pine, and that’s even less than if you build it with Southern yellow pine. Also be sure to check each product’s instructions to learn the recommended weight capacity for hangers, fasteners, etc. People Get Intimidated By The Thought of Math and Engineering. Putting the joists 12″ apart, versus 16″ apart, changes the deflection value of those joists. Many people are intimidated with trying to … If you’re allowed to span 16′ with your joists 16″ on center, but you only span 8′ with your joists 12″ on center, then that deck can hold substantially more weight. Divide by the number of beams which will be installed to get the loading per beam. You can make your joists able to hold thousands of pounds of weight and your footings could sink into the ground. Even though you meet codes for joists and hangers, you still have to meet the manufacturer’s composite decking standards. Get shopping advice from experts, friends and the community! I have heard they don't bear much weight at all, and also heard they're almost as reliable as the 2x10s. is what we consider “dead load.” Then the remaining 10 lbs. He started writing technical papers while working as an engineer in the 1980s. It could be a lot of weight for a layman who has no clue about a 4×4 beam’s horizontal weight support. The primary reasons that a customer may want to learn more about the weight load of their deck has to do with the current trends toward outdoor living. is considered “live load.” That’s the people and the “stuff” on the deck. per square foot. Sales Compensation & Benefits Report 2019, After the election, COVID-19 determines what’s ahead for housing market, U.S. Lumber Coalition pushes for Canadian trade reform, L&W Supply opens third branch in Nashville, Deckorators Trailhead entry-level composite decking. per square foot. Even when we know what a deck’s weight load may be when building it, we don’t build decks to the load value of failure. As you can see, the answer to the question is far more than just how much weight can a deck hold. Answer Save. Calculate the section modulus for the different beams which you could use. The weight that a 4×4 beam can support horizontally depends on the type and quality of the wood used. International Building Code section 507.3.1 says that composite decking must be installed per manufacturer’s published instructions. Beams on 16-inch centers will also reinforce each other. A simple trick would be place your Weight Machine on a 8 foot x 4 foot 3/4 inch piece of plywood. As homeowners enter the summer months, many are looking into DIY projects that will allow them to upgrade their outdoor living space. For a flat roof with snow loading, this is 25 lbs. Before you give them an answer, be aware that deck loads are a factor of the materials that you use, your local building codes, and the deflection of lumber. Bert Markgraf is a freelance writer with a strong science and engineering background. per square foot for northern areas of the U.S. For rooms which are heavily frequented, it may be 50 lbs. Snow load will affect a deck’s weight load in a big way. A 2-by-8 beam would be sufficient. per square foot. Also look up in your building code book, or ask your local inspectors for a chart that shows the species of wood that you want to use. If you weigh 200 LBS. irc 2003 #3 y.p. In short there’s no one right answer to “how much can my deck hold?” However, one rule of thumb to keep in mind while answering the question is that the answer commonly is that if a deck is properly designed, it’s built to hold 50 lbs.

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