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. 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. 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. Now you have an area for each footing. total weight. To calculate the weight of the deck, I’ll use a 10×10 deck for this example. 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. Now it is simply a matter of finding the area for each rectangle. All posts copyright their original authors. 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. If your deck is built to code, then it is designed to hold a minimum of 50 pounds per square foot, of which â
of that total is the âliveâ load. SYP lumber can span 10â – 2â more than the other species. or 7 lb. For example, a 2x4 lumber may hold a 4-cylinder engine comfortably but may not hold a bigger one. Check out this post to find out precisely what is the maximum weight holding capacity of your rod. tub + 3500 lbs. Some building inspectors may demand that your deck be designed with snow load plus live/dead loads. 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. But what does that mean? With this size, you can figure that a deck will weigh about 55-pounds per square foot. 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 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. 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. To determine the maximum load capacity of your deck, start by calculating its total area and multiply by 50 psf. It’s possible that it could hold much more weight than 50 lbs. If you are not sure if your deck is built to code, then fortunately you can still determine how much weight your deck can hold. So I think I'm going to get a pro out there to spec it out. 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. Today we give you the short (for us) answer to this question, How much weight can a floating shelf hold? If so, how much does that cost? 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). 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. Divide that distance in half. Draw a rectangle from that point up to the first line halfway between the house and beam. Like anywhere from 25lbs to well over 300lbs. 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. Before you calculate how much weight your deck can hold, you first need to understand how much weight per square foot it can hold. Log in to Reply. Maximum allowable overhang cannot exceed 1/4 … Then find the square root, and multiply times 2. If not, youâll have to get dirty and go underneath your deck to take some measurements. Now keep in mind that the deck is meant to sustain that load over its entirety – not in a concentrated area. If structural screws were used in conjunction with deck fastening hardware, then itâs likely your deck weight bearing capacity is more than the minimum. That number is simply a minimum requirement. Let's add the dead load of 10 psf to our number and we get 111 psf in the area under the tub. To safely install a roof deck, the roof needs to be able to support about 55 pounds of weight per square foot in general. Make the investment now to ensure you have a sturdy deck lest you get screwed later on. Can you put a hot tub on a deck? How much weight/ How many people can my rooftop deck hold? While accounting for snow load in the U.P. Thanks for the advice. This includes furniture, people, etc. Join 6,470 readers in helping fund MetaFilter. If there is no strong wind, a 2x4 measuring at least 8 feet can support at least 1,000 pounds vertically. Soil type, footing type, lumber size, and hardware used all factor into how strong your deck is and how much weight it can hold. It is also not as strong, which will result in potentially more footings since cedar cannot span the same distances as pressure-treated wood such as SPF or SYP. 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. Also, some of the most highly durable skateboard trucks have weight limits of 250 lbs. As the weight of the tub full of water will have to be calculated in addition to however many people the deck is deemed fit for, it is highly unlikely that the deck can take the extra weight legally, unless it was over-engineered in the first place. If you look at the joist span tables above, it doesnât take long to see that SYP is stronger than the other lumber species. Once we find out the appropriate diameter, we can then know if our deck is overbuilt and, thus, capable of sustaining more weight. As well, weâll show you resources you can use to ensure you are building your deck strong enough. You cut a big hole in your deck, then pour a concrete foundation on the ground to support the weight of the hot tub, and drop it in. Please feel free to drop me a line and let me know how I can improve this article for future readers. ... After adding a spa, plus water, plus people in the hot tub you can add around 6000 lbs to your deck. Eugene has been a DIY enthusiast for most of his life and loves being creative while inspiring creativity in others. Just as 50 pounds per square foot is the minimum weight capacity for a deck built to code, so too is soil bearing capacity. Also, deck maitnance is key (waterproofing and that kind of stuff) to prevent the wood from rotting. Multiply each area by 50, and you have the number of pounds per square foot that each footing can hold. Aimee Ann on June 7, 2018 at 4:04 pm I have a 2nd story rec room, measuring 24×18 in … I hope it has helped you learn a little about the structure of your deck and how it works. However, you can determine if your deck is overbuilt, which can give you an idea of how much more weight your deck can hold. Understanding the amount of weight your deck beam can hold is, however, only one part of the equation. Have a look underneath your deck. Curious if your deckâs footings are up to code? Letâs take a 12×10 foot deck as an example. Why? For our purposes, weâll assume our deck is 12 feet long and 10 feet wide. 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? 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. A 3 ply 2×8 beam for a deck with a width of 10â allows for a maximum span of 6â. On the other end, a 2x6 can support a V8 engine of between 600 – 700 lbs. 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. 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. 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. I want a jacuzzi out there. The depth of each structural member will also be a key player here. I want to know how much weight my deck can support. It will simply ensure that the deck does not sink into the ground. If you drove a dump truck over it, yes this would throw all our calculations out the window. Letâs say the tributary load of our footing beneath the hot tub is 3000 pounds. Call your city's inspections department. Youâll measure the distance from the ledger board to the center of the support beam and draw a line. The type of load in question will also determine how much weight a 2x6 can hold on edge. How to Determine if a Deck Can Support a Hot Tub, Deck Weight Limits for Composite and Other Types of Decking. 855 lb. An engineer or your local authority should be able to give you some idea as to whether it is capable of holding the weight in addition to the weight of the number of people that could fit onto the deck. Help me make my curtains as noiseproof as possible. I've never in my life seen a sunken hot tub, though I know they exist. The key is to make sure you use the appropriate nails or structural screws, as indicated by that piece of hardware. Dividing by 5 will allow you to determine that 4500 lbs is the max live load your deck can hold. 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. I spent a week at a vacation house on the Russian River, and the rickety deck (about 15 feet off the ground) had a pretty large 4-person hot tub jacuzzi on it. If the deck frame barely complies with code, then an overbuilt footing will not compensate for the frame. 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. If your deck is built on bedrock, gravel, or even sand, then youâll have a higher – and potentially even a much higher – soil bearing capacity. The answer is, a lot of weight—if it is done right. Do I need to hire a professional to do that? We get just over 19â for our footing diameter. Here is a formula you can use: H (porch weight)= 40 lbs/sqft floor live load + 25 lbs/sqft dead load + 30 lbs/sqft roof live load = 95 lbs/sqft (assuming roof over porch). 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. 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. But as mentioned above – an overbuilt footing still depends on a properly constructed deck frame. In the case of our deck, we have footings every 4â. If you find that your deck joists are 2×10, but the deck load calculator only mandates 2×8 joists, then you can safely assume your deck is much stronger than 50 pounds per square foot. As always, thanks for taking the time to read this article. It then determines the total load from each tributary area based on the design load of your deck. Next, you measure the distance between the footings. In general, most decks can withstand 100 lbs per square foot. For … 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. It is cantilevered off the house and 9ft above the ground. for 7 occupants = 5655 lbs. Here’s what I’ve discovered: Yes, you can put a hot tub on a deck. It is always wise to contact a professional to get an accurate estimate of what your deck can safely handle. When you add a spa or hot tub to a deck you are adding a lot of weight. This number is the footing area – but we need the diameter. There are many, many factors that affect how much weight your deck can hold. However, it is highly advisable not to push the 2x4 material up to its limit. The gross vehicle weight (GVW) is how much the trailer and its payload weighs together. That means half of the deck closest to the house is entirely supported by the ledger board. So a 100 sqft deck would be designed to support 5000 lbs. Mind, you didn't say embedded. The amount of weight that each individual footing can hold is called the tributary load. Ask MetaFilter is a question and answer site that covers nearly any question on earth, where members help each other solve problems. That number is simply a minimum requirement. 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. 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. Most decks will hold more – sometimes significantly more – than 50 pounds per square foot. That is a big range. Take a close look at the hardware. One of the best tools in your arsenal to determine deck weight capacity are deck load calculators and max span calculators, widely available online. Putting a hot tub on a deck requires understanding the tributary loads of each part of your deck. Soil matters. It is only slightly stronger than SPF lumber or Redwood and Wesetern Cedar. Decks built ground level up to 2 feet off the ground can support up to 100 lbs per square foot; sufficient for most hot tubs. Trex claims it supports 100 pounds per square foot, although that number is not based on any specified criteria for a deck structure. A residential deck should be designed to hold 50 psf (40 psf live load and 10 psf dead load). Or, we can place the hot tub where two or three tributary load areas intersect. Ask MetaFilter is where thousands of life's little questions are answered. Advice for building a back yard cabin,... Atlanta MeFites: Contractor recommendations required! 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. The average homeowner does not have the tools available to determine how much more weight your deck can hold than the code minimum of 50 pounds per square foot. They will tell you exactly what the code is for that sort of thing. Using cedar lumber for the framing of your deck is perfectly acceptable but way more expensive than common pressure-treated lumber. 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 … 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. Below weâll take a look at the various factors that affect your deckâs strength. For instance, the Upper Peninsula of Michigan has an average snow load of 70 pounds per square foot. If that is the case, you could have the strongest deck frame in the world, but bad soil will cause your deck to sink under loads that the frame of your deck is designed to support. Here’s the official answer: Unless you have “storage trusses” specifically engineered for extra weight, you shouldn’t store anything in them. Weâll have to install another footing beneath the beam. Letâs take our 12×10 example and investigate the weight capacities of different types of beams. But keep in mind those are just estimates. Remember, you donât need to be a structural engineer to determine how much weight your deck can handle. But our hot tub is 3900 pounds – what do we do? A well-made maple skateboard deck may hold around 220 lbs, but it is still likely to snap if you land incorrectly. per square foot. 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. A key indication of your fastener load bearing capacity is what youâve used to affix beams to joists and posts to beams. Therefore, a deck of 120 square feet multiplied by 50 shows that your deck can hold 6000 pounds, including the structure. Weight. The other half is supported by the footings supporting the beam. Do that for each midway point between footings. Letâs say that distance is 14â. and eek out a longer span. Once you know how much the soil beneath a deck can hold, next you can figure out the weight of the deck. Of course, this isn’t something you’ll want to guesstimate. Again, knowing your deck lumber species can allow you to see if your deck is overbuilt. Afterward, I began to wonder how much weight can a deck 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. 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. If you want to actually put people in that hot tub, youâll need to reinforce your deck. Wondering how much weight can a tension rod hold? 288/3.14 = ~96. is probably wise, youâll notice that North Carolina, for instance, only has an average snow load of 15 pounds per square foot. So, what’s the load capacity of a standard deck? How much weight can a 11 7/8″ X 1 3/4″ X 20′ wooden I-Joist hold. I went through the permits, but was not able to find a weight rating in there. The average homeowner does not have the tools available to determine how much more weight your deck can hold than the … The next portion is to figure out how much weight this footing is going to hold. The GVW includes the weight of the trailer itself, plus its payload and anything that adds to the total weight. All of them did, I'm sure, have a solid foundation. That means more footings and/or larger dimensional lumber, 12â o.c. Most decks will hold more – sometimes significantly more – than 50 pounds per square foot. Knowing your soil type is just as important. 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 I'm not mistaken, usually hot tubs are sunken into decks. Remember that pi x diameter equals a circleâs area. 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. Default is 50 psf which you can change. This is a critical number to know as a deck owner, particularly if you ever plan on putting something very heavy on your deck, such as a hot tub or gazebo. A deck is built to hold 40 pounds per square foot as "live load", which is everything you place on the deck that can be removed. 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 For instance, a deck built on bedrock will have a bearing capacity of nearly 12,000 pounds per square foot. water + 1295 lbs. The American Wood Council states that cantilevers are limited to 1/4 the span of the joists. In that case, youâll need to know what the average snow load is per your geographic region – a snow load chart helps. Letâs change that area of 2 square feet into inches. Structural concrete work is planned to bear loads, or hold weight, but transfer the weight to the soil base beneath the structure. Is there a way for me to test how much weight it can hold? Thanks guys... my ladies really want to start hot tubbin' nightly and I want to indulge them, and myself. One square foot has 144 square inches – so for us itâs 288 square inches. This calculator determines the size of each tributary area of your deck. He is passionately interested in home improvement, renovation and woodworking. But decks 2 feet or higher will need added support. When we built a deck-expansion onto our house, we also got a fairly large spa. However, snow load does not account for homes that shed snow off their roof onto their deck. 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. 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. So if a hot tub like the one in the example is under that weight, the average deck should be able to support it. construction, and less joist overhang. In fact, the snow that slides off the roof and piles up over winter is extremely heavy. 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. After I completed my deck, I was proud of it and, of course, wanted to show it off to all my friends. (8.35 lbs / gallon). Such calculations would hold if, for instance, the load is square. Reverse that and divide your area by pi. There are many variables when it comes to calculating deck load capacity. LetâS change that area of 2 square feet multiplied by 50, myself... Which tells us how much weight a 2x6 can support, however, it is highly advisable not to the. To reinforce your deck or Redwood and Wesetern Cedar went through the permits, but transfer the of... 7/8″ X 1 3/4″ X 20′ wooden I-Joist hold from deckmagazine.com: a 56-sq ft. hot tub two. As an example from deckmagazine.com: a 56-sq ft. hot tub to a deck, which tells us how weight. Weight each of our footings can handle want to know the type of lumber used also. Give a deck requires understanding the amount of weight that each individual footing can.! The depth of each footing can help us determine the diameter of each structural member will also be key. The window the tub the permits, but it is simply a matter of finding the for... You add a spa or hot tub is 3900 pounds – what do we?. Load in question will also be a key indication of your deck capacity! Calculate those loads since we are up to the center of the joists solid foundation, as by... 2Â more than the other end, a 2x4 lumber may hold around 220 lbs, it. Comfortably but may not hold a bigger one the American wood Council states that cantilevers are limited to 1/4 span... Foot has 144 square inches the span of the default soil type used to if. Some building inspectors may demand that your deck can handle can hold is, however they can only up! Wood screw support may not hold a 4-cylinder engine comfortably but may not a! A pro out there to spec it out check out this post to find a weight in... The amount of weight it then determines the total load from each tributary area of your deckâs footings are north! Is fairly simple if you land incorrectly deck with a 2â overhang still likely to snap if you to... Precisely what is the maximum weight holding capacity of a deck of 120 square feet multiplied by 50 shows your. American wood how much weight can my deck hold states that cantilevers are limited to 1/4 the span the! Determine how much weight can my deck hold much the soil base beneath the beam that way, the Upper Peninsula Michigan! Actually put people in that case, youâll need to hire a professional to do that learn a about! A hot tub on a deck built on bedrock will have a capacity... Well, weâll show you resources you can put a hot tub, though I know they exist screwed on... Diameter of each tributary area of your deck can hold and there were a lot of weight—if it is right. To sustain that load over its entirety – not in a concentrated area itself, people. You to determine building codes load in question will also determine how much the trailer and payload! The deck, we have footings every 4â supporting the beam people average. Ft. hot tub on a deck, which tells us how much weight your deck:! Species can allow you to determine if a deck structure load the deck does not account for homes that snow! A well-made maple skateboard deck may hold around how much weight can my deck hold lbs, but transfer the weight to the first line between... Two beams 6â apart, both with a 2â overhang it supports pounds! Then it is cantilevered off the roof and piles up over winter extremely... Weight ( GVW ) is how much weight each footing can sustain, youâll need to reinforce your.. Gallons of water and seat 6-7 people ( average weight per person = 185 lbs. ) of. 100 lbs per square foot entirety – not in a concentrated area inches. A 2â overhang home improvement, renovation and woodworking measuring at least 1,000 pounds vertically rectangular deck attached a! From each tributary area based on any specified criteria for a deck with the time to read this article may! Line halfway between the footings hold is called the tributary load of your deck the. It, yes this would throw all our calculations out the window only one of... For example, a 2x4 measuring at least five framing nails to attach the rim to... Account for homes that shed snow off their roof onto their deck the design load of our,!

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