As well, weâll show you resources you can use to ensure you are building your deck strong enough. Ask MetaFilter is a question and answer site that covers nearly any question on earth, where members help each other solve problems. On the other end, a 2x6 can support a V8 engine of between 600 – 700 lbs. For our purposes, weâll assume our deck is 12 feet long and 10 feet wide. and eek out a longer span. This means that if you had a 100 square foot deck (10′ x 10′), you’d be able to hold 5,000 pounds above it (assuming the weight was evenly distributed). Why? The total load for each tributary area is then divided by the area of each footing in order to determine the load psf imposed on the soil. When we built a deck-expansion onto our house, we also got a fairly large spa. For instance, a 3-ply 2×12 beam can span 8â between footings when joists are 12â long when both SPF or Western Cedar is used. The three major types of wood species used in deck construction are Southern Yellow Pine (SYP), some combination of Spruce, Pine, and Fir (SPF), and Redwood, Western Cedar, or Red Pine. That way, the weight is divided amongst three footings. Make the investment now to ensure you have a sturdy deck lest you get screwed later on. In that case, youâll need to know what the average snow load is per your geographic region – a snow load chart helps. This is for soils that are a mix of loam, silt, and clay, which also happens to be one of the weaker types of soil. As always, thanks for taking the time to read this article. If so, how much does that cost? Youâll also have to know the type of lumber used – in this case it is SPF since we are up north. Structural concrete work is planned to bear loads, or hold weight, but transfer the weight to the soil base beneath the structure. So I think I'm going to get a pro out there to spec it out. However, it is highly advisable not to push the 2x4 material up to its limit. It also is not attached to a house, so it has two beams 6â apart, both with a 2â overhang. for 7 occupants = 5655 lbs. Using the example above, if you have a beam of that size built with SYP lumber, and you have a span of 10â but with three footings instead of two, you can safely assume the overall weight-bearing capacity of the deck is far more than 50 pounds per square foot. The next portion is to figure out how much weight this footing is going to hold. per square foot. Therefore, a deck of 120 square feet multiplied by 50 shows that your deck can hold 6000 pounds, including the structure. It is cantilevered off the house and 9ft above the ground. Below Iâve listed a few of the major areas that give a deck the ability to sustain large amounts of weight. Remember, you donât need to be a structural engineer to determine how much weight your deck can handle. However, if you are using post to beam connectors, joist hangers, and hurricane ties to support your structure, then standard 10d nails are just fine – the hardware itself will provide most of the support. The first thing you need to work out is how much water the jacuzzi will hold (in gallons) and multiply that by 8.345404, which is how many pounds one gallon weighs. One square foot has 144 square inches – so for us itâs 288 square inches. I can now safely assume that my deck can hold much more than 50 pounds per square foot, as indicated by the deck span chart. Putting a hot tub on a deck requires understanding the tributary loads of each part of your deck. One of our last variables in determining deck weight bearing capacity, fasteners, are arguably the most important aspect of deck construction and the most overlooked. There’s no official skateboarding weight limit, but the quality of the board you buy will affect how much weight it can bear before it gives way. That being said, most weight-bearing calculators for decks assume a default of 1500 pounds per square foot for soils. Is there a way for me to test how much weight it can hold? I want a jacuzzi out there. 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 … That means that the overall structure can support a load of people, or âstuffâ, of at least 40 pounds per square foot on top of your deck. For … (8.35 lbs / gallon). Then check out this footing load table, which can tell you exactly how big your footings need to be based on the size of the post, the span of the beam, and the length of your joists. There is no specific amount of weight that each weight plate can support, however they can only hold up to 10. If you want to host a large party on your deck but still arenât sure if it can handle the weight, itâs best to contact a building engineer. The answer is, a lot of weight—if it is done right. The Spa itself if friggin heavy (to the extent of needing to use a crane to lift it onto a 2nd-story deck). Also, some of the most highly durable skateboard trucks have weight limits of 250 lbs. It will simply ensure that the deck does not sink into the ground. At the beginning of the article, we determined that the total live load the deck could sustain was 4500 pounds, after subtracting for the âdeadâ load, which is the deck structure itself. For instance, the Upper Peninsula of Michigan has an average snow load of 70 pounds per square foot. Dividing by 5 will allow you to determine that 4500 lbs is the max live load your deck can hold. Add that to the typical 50 a deck is built for, and youâve got a deck that needs to hold 120 pounds per square foot. Do that for each midway point between footings. Draw a rectangle from that point up to the first line halfway between the house and beam. After I completed my deck, I was proud of it and, of course, wanted to show it off to all my friends. or 7 lb. The gross vehicle weight (GVW) is how much the trailer and its payload weighs together. Now keep in mind that the deck is meant to sustain that load over its entirety – not in a concentrated area. Some building inspectors may demand that your deck be designed with snow load plus live/dead loads. He is passionately interested in home improvement, renovation and woodworking. And it does not really matter because the frame of a Trex deck is what supports the deck, not the deck boards; therefore, a Trex deck is no stronger than a lumber deck. Divide that distance in half. What started as a small gathering ended up pretty large, and there were a lot of people on my deck. 855 lb. Again, knowing your deck lumber species can allow you to see if your deck is overbuilt. That means more footings and/or larger dimensional lumber, 12â o.c. SYP lumber can span 10â – 2â more than the other species. Don't get confused with what weight you might think or want to load the deck with. So, if the spa is less than 100 pounds per square foot you likely have nothing to worry about. But keep in mind those are just estimates. Using cedar lumber for the framing of your deck is perfectly acceptable but way more expensive than common pressure-treated lumber. That number is simply a minimum requirement. Therefore if you have a hot tub that weighs 4500 pounds, that doesnât mean your deck can support it since that weight is only in a concentrated area. Knowing your soil type is just as important. Here’s an example from deckmagazine.com: A 56-sq ft. hot tub with a dry weight of 855 lbs. If we have just four footings of 1 sqft under the tube creating four rought equal tributary areas of 16 sqft each footing will have to carry 16x111 lbs or 1776 lbs over our 1 sqft footing and we have 1776 psf When you add a spa or hot tub to a deck you are adding a lot of weight. For instance, a deck built on bedrock will have a bearing capacity of nearly 12,000 pounds per square foot. Letâs change that area of 2 square feet into inches. Multiply each area by 50, and you have the number of pounds per square foot that each footing can hold. All of them did, I'm sure, have a solid foundation. Luckily, we now know how to calculate those loads since we did it a few paragraphs above. per square foot. How much weight can a 11 7/8″ X 1 3/4″ X 20′ wooden I-Joist hold. The spa filled has 320 gallons or 2672 lbs. It is critical that deck owners understand that each individual part of a deck contributes to a deckâs capacity to hold weight, and the failure of any part will result in overall structural failure. For the majority of building codes in North America, youâll find that span charts are created to account for a 40-pound live deck load and 10-pound dead load. Today we give you the short (for us) answer to this question, How much weight can a floating shelf hold? Add to this the weight of the tub itself and any filters, pumps etc and you will have a total weight for the whole thing. It may cost you, but youâll know for sure the limitations of your deck and the steps for rectifying any issues. Therefore, if you have a deck beneath a roof eave where snow will slide onto, you either need to regularly clear your deck or install a roof snow guard of some type. Like anywhere from 25lbs to well over 300lbs. However, youâll have to get underneath — or at least have a good view of the underside of your deck – to see the dimension of lumber it was built with as well as to measure the distance between footings, footing type, and the type of hardware used. In the case of our deck, we have footings every 4â. Thanks guys... my ladies really want to start hot tubbin' nightly and I want to indulge them, and myself. Or, we can place the hot tub where two or three tributary load areas intersect. In that case, designing your deck in that state for 65 pounds per square foot probably isnât necessary as the snow would either melt or could easily be cleared before you would use your deck. The type of load in question will also determine how much weight a 2x6 can hold on edge. That number is simply a minimum requirement. Generally, we’re talking about 50 pounds per square foot. Trex claims it supports 100 pounds per square foot, although that number is not based on any specified criteria for a deck structure. Add to this the weight of the tub itself and any filters, pumps etc and you will have a total weight for the whole thing. How to Determine if a Deck Can Support a Hot Tub, Deck Weight Limits for Composite and Other Types of Decking. Calculating a tributary load is fairly simple if you have a standard rectangular deck attached to your house. Using the resources above, you can find out both your deckâs total weight capacity and the deck load capacity for each footing on your deck. Ask MetaFilter is where thousands of life's little questions are answered. It is only slightly stronger than SPF lumber or Redwood and Wesetern Cedar. Maximum allowable overhang cannot exceed 1/4 … That means half of the deck closest to the house is entirely supported by the ledger board. On the other hand, if you have soil that is extremely wet, all clay, or simply unstable, then it is likely your soil will not sustain the minimum of 1500 pounds as dictated by building code. A well-made maple skateboard deck may hold around 220 lbs, but it is still likely to snap if you land incorrectly. If the deck frame barely complies with code, then an overbuilt footing will not compensate for the frame. That is a big range. It’s possible that it could hold much more weight than 50 lbs. Knowing the tributary load of each footing can help us determine the diameter of each footing. While accounting for snow load in the U.P. I want to know how much weight my deck can support. With this size, you can figure that a deck will weigh about 55-pounds per square foot. Log in to Reply. Check out this post to find out precisely what is the maximum weight holding capacity of your rod. Weâll say the tributary load of your interior deck footing is 3000 pounds. One of the best tools in your arsenal to determine deck weight capacity are deck load calculators and max span calculators, widely available online. is probably wise, youâll notice that North Carolina, for instance, only has an average snow load of 15 pounds per square foot. This includes furniture, people, etc. Mind, you didn't say embedded. Have a look underneath your deck. Calculating tributary loads is not difficult, as long as you have a diagram of your deckâs framing structure. Letâs say that distance is 14â. However, snow load does not account for homes that shed snow off their roof onto their deck. For example, a 2x4 lumber may hold a 4-cylinder engine comfortably but may not hold a bigger one. tub + 3500 lbs. Let's add the dead load of 10 psf to our number and we get 111 psf in the area under the tub. The average homeowner does not have the tools available to determine how much more weight your deck can hold than the … Below weâll take a look at the various factors that affect your deckâs strength. Letâs take our 12×10 example and investigate the weight capacities of different types of beams. My spa started off at 600 lbs. If you go under this deck and find you have 3 ply 2×8 beams, then you can use a span table to determine footing placement. Do I need to hire a professional to do that? Reverse that and divide your area by pi. It is 10'x16', framed with pressure treated wood. How much weight will a .125 inch wood screw support? The depth of each structural member will also be a key player here. We get just over 19â for our footing diameter. Eugene has been a DIY enthusiast for most of his life and loves being creative while inspiring creativity in others. First, you divide the tributary load of 1500 – the weight-bearing capacity of the default soil type used to determine building codes. 3000/1500 is 2. ... After adding a spa, plus water, plus people in the hot tub you can add around 6000 lbs to your deck. If I'm not mistaken, usually hot tubs are sunken into decks. How much weight/ How many people can my rooftop deck hold? Weâll have to install another footing beneath the beam. Just as 50 pounds per square foot is the minimum weight capacity for a deck built to code, so too is soil bearing capacity. Help me make my curtains as noiseproof as possible. If you don't already have plans for the deck, draw up a sketch showing the size and spacing of bearers and joists (including the material if you can), the dimensions and materials of the decking itself and the details of how it is held up. If your footing is 24â sonotube, then it is more than strong enough to support your deck. 288/3.14 = ~96. Since a hot tub will more than likely fall into the area of just one, or maybe two, footings, we need to know that one footing can handle the weight of a hot tub. Thanks for the advice. It means different types of soil vary in terms of how much weight they can support before whatever they are supporting sinks into the earth. The gross vehicle weight rating (GVWR) is the maximum amount of weight the trailer is able to safely hold and transport, as rated by the manufacturer. However, you can determine if your deck is overbuilt, which can give you an idea of how much more weight your deck can hold. Now you have an area for each footing. All posts copyright their original authors. It then determines the total load from each tributary area based on the design load of your deck. If only nails were used, without hardware of any type, then you might want to think twice before placing an 8000-pound hot tub on your deck. If you drove a dump truck over it, yes this would throw all our calculations out the window. They'll probably tell you that you have to pull a permit, so I wouldn't give them your name or address unless you want to jump threw those hoops. Simply because it is assumed that you will clear your deck prior to inviting 20 of your friends over for a beer on that deck. The use of structural, hex-head wood screws is a better choice, as they have a much higher shear capacity compared to standard 16d nails used in deck construction. In general, most decks can withstand 100 lbs per square foot. Most decks will hold more – sometimes significantly more – than 50 pounds per square foot. However, a properly constructed cedar deck to specs of 50 pounds per square foot will be able to hold the same amount of weight as a deck that has used typical pressure-treated wood. I've never in my life seen a sunken hot tub, though I know they exist. 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. If structural screws were used in conjunction with deck fastening hardware, then itâs likely your deck weight bearing capacity is more than the minimum. For instance, if you know the dead load of the deck will be less than the prescriptive 10 lb., then you can select 5 lb. The joists are 2"x12" over 20ft, 16" on center ; The framing under the deck is typical 2"x4" framing (living space), on a concrete foundation; The deck was built in 1980 up to code. Call your city's inspections department. Lastly, weâll take a look at the different types of lumber you can use for your deck and how it will affect the weight capacity of the overall structure. If your deck was built to code and the appropriate permits were pulled and signed off on, then it is entirely likely your deck holds a minimum of 50 pounds per square foot. My favorite storage solution is to shove more and more stuff “up in the rafters.” And that got me thinking… how much weight can my roof trusses take? Then find the square root, and multiply times 2. On the other hand, if you build in a ground-snow load that exceeds 40 psf, then you can enter your snow load in the “Live Load” field to size a joist span to handle heavy snow. The center of the deck closest to the extent of needing to use a crane to lift it onto 2nd-story. There are many, many factors that affect how much weight it can hold on edge 'm mistaken. Supporting the beam always wise to contact a professional to check it out much weight your lumber! That adds to the ends of your deck lumber species can allow you to see if your deckâs framing.. 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