If not, you’ll have to get dirty and go underneath your deck to take some measurements. The type of load in question will also determine how much weight a 2x6 can hold on edge. There are many variables when it comes to calculating deck load capacity. How does this affect load-bearing capacity? Also, some of the most highly durable skateboard trucks have weight limits of 250 lbs. 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. Knowing the tributary load of each footing can help us determine the diameter of each footing. You’ll measure the distance from the ledger board to the center of the support beam and draw a line. As always, thanks for taking the time to read this article. Since we are shelf geeks and own a company that manufactures floating shelves, this is an easy one for us. per square foot. Using the resources above, you can find out both your deck’s total weight capacity and the deck load capacity for each footing on your deck. If there is no strong wind, a 2x4 measuring at least 8 feet can support at least 1,000 pounds vertically. Now you have an area for each footing. total weight. The gross vehicle weight (GVW) is how much the trailer and its payload weighs together. Reverse that and divide your area by pi. It’s possible that it could hold much more weight than 50 lbs. 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 … 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 is a big range. If so, how much does that cost? So, what’s the load capacity of a standard deck? can hold 420 gallons of water and seat 6-7 people (average weight per person = 185 lbs.). Soil matters. How much weight can a 11 7/8″ X 1 3/4″ X 20′ wooden I-Joist hold. Before you calculate how much weight your deck can hold, you first need to understand how much weight per square foot it can hold. Aimee Ann on June 7, 2018 at 4:04 pm I have a 2nd story rec room, measuring 24×18 in … 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. All posts copyright their original authors. 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. per square foot. 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. That means more footings and/or larger dimensional lumber, 12” o.c. Help me make my curtains as noiseproof as possible. Knowing your soil type is just as important. First, you divide the tributary load of 1500 – the weight-bearing capacity of the default soil type used to determine building codes. Here’s an example from deckmagazine.com: A 56-sq ft. hot tub with a dry weight of 855 lbs. After I completed my deck, I was proud of it and, of course, wanted to show it off to all my friends. Some building inspectors may demand that your deck be designed with snow load plus live/dead loads. That number is simply a minimum requirement. I highly suggest hiring a professional to check it out. 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. But what does that mean? To determine the maximum load capacity of your deck, start by calculating its total area and multiply by 50 psf. 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. Today we give you the short (for us) answer to this question, How much weight can a floating shelf hold? 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. The thickness of concrete is an important factor in load-bearing strength, but to conserve resources and avoid over-building, other factors are also taken into consideration. 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. It then determines the total load from each tributary area based on the design load of your deck. One of the best tools in your arsenal to determine deck weight capacity are deck load calculators and max span calculators, widely available online. The … That number is simply a minimum requirement. There are many, many factors that affect how much weight your deck can hold. 288/3.14 = ~96. In that case, designing your deck in that state for 65 pounds per square foot probably isn’t necessary as the snow would either melt or could easily be cleared before you would use your deck. He is passionately interested in home improvement, renovation and woodworking. There is no specific amount of weight that each weight plate can support, however they can only hold up to 10. If I'm not mistaken, usually hot tubs are sunken into decks. Eugene has been a DIY enthusiast for most of his life and loves being creative while inspiring creativity in others. ... After adding a spa, plus water, plus people in the hot tub you can add around 6000 lbs to your deck. Afterward, I began to wonder how much weight can a deck hold? Or, we can place the hot tub where two or three tributary load areas intersect. 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. For the majority of building codes in North America, you’ll find that span charts are created to account for a 40-pound live deck load and 10-pound dead load. Draw a rectangle from that point up to the first line halfway between the house and beam. How much weight/ How many people can my rooftop deck hold? Trex claims it supports 100 pounds per square foot, although that number is not based on any specified criteria for a deck structure. 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. If you want to actually put people in that hot tub, you’ll need to reinforce your deck. But as mentioned above – an overbuilt footing still depends on a properly constructed deck frame. 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). 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. 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 drove a dump truck over it, yes this would throw all our calculations out the window. A key indication of your fastener load bearing capacity is what you’ve used to affix beams to joists and posts to beams. Next, you measure the distance between the footings. Also, deck maitnance is key (waterproofing and that kind of stuff) to prevent the wood from rotting. In fact, the snow that slides off the roof and piles up over winter is extremely heavy. The other half is supported by the footings supporting the beam. 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. All of them did, I'm sure, have a solid foundation. Dividing by 5 will allow you to determine that 4500 lbs is the max live load your deck can hold. Maximum allowable overhang cannot exceed 1/4 … One square foot has 144 square inches – so for us it’s 288 square inches. For example, a 2x4 lumber may hold a 4-cylinder engine comfortably but may not hold a bigger one. Most decks will hold more – sometimes significantly more – than 50 pounds per square foot. tub + 3500 lbs. When we built a deck-expansion onto our house, we also got a fairly large spa. construction, and less joist overhang. or 7 lb. is probably wise, you’ll notice that North Carolina, for instance, only has an average snow load of 15 pounds per square foot. It is only slightly stronger than SPF lumber or Redwood and Wesetern Cedar. It is critical that deck owners understand that each individual part of a deck contributes to a deck’s capacity to hold weight, and the failure of any part will result in overall structural failure. 3000/1500 is 2. Multiply each area by 50, and you have the number of pounds per square foot that each footing can hold. Just as 50 pounds per square foot is the minimum weight capacity for a deck built to code, so too is soil bearing capacity. If you look at the joist span tables above, it doesn’t take long to see that SYP is stronger than the other lumber species. We’ll have to install another footing beneath the beam. On the other end, a 2x6 can support a V8 engine of between 600 – 700 lbs. It is cantilevered off the house and 9ft above the ground. Call your city's inspections department. For instance, a deck built on bedrock will have a bearing capacity of nearly 12,000 pounds per square foot. In general, most decks can withstand 100 lbs per square foot. However, snow load does not account for homes that shed snow off their roof onto their deck. I have a deck. Soil type, footing type, lumber size, and hardware used all factor into how strong your deck is and how much weight it can hold. I want to know how much weight my deck can support. 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. 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. Don't get confused with what weight you might think or want to load the deck with. 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. For instance, a 3-ply 2×12 beam can span 8’ between footings when joists are 12’ long when both SPF or Western Cedar is used. Wondering how much weight can a tension rod hold? It also risks collapsing a deck. How to Determine if a Deck Can Support a Hot Tub, Deck Weight Limits for Composite and Other Types of Decking. Structural concrete work is planned to bear loads, or hold weight, but transfer the weight to the soil base beneath the structure. My spa started off at 600 lbs. Let’s change that area of 2 square feet into inches. Weight. You’ll also have to know the type of lumber used – in this case it is SPF since we are up north. 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 Here’s the official answer: Unless you have “storage trusses” specifically engineered for extra weight, you shouldn’t store anything in them. What started as a small gathering ended up pretty large, and there were a lot of people on my deck. Log in to Reply. If you want to host a large party on your deck but still aren’t sure if it can handle the weight, it’s best to contact a building engineer. Many building departments limit joist cantilevers to 24" maximum. Of course, this isn’t something you’ll want to guesstimate. 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. I went through the permits, but was not able to find a weight rating in there. It will simply ensure that the deck does not sink into the ground. It is 10'x16', framed with pressure treated wood. Therefore, a deck of 120 square feet multiplied by 50 shows that your deck can hold 6000 pounds, including the structure. Add that to the typical 50 a deck is built for, and you’ve got a deck that needs to hold 120 pounds per square foot. I hope it has helped you learn a little about the structure of your deck and how it works. 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. 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. This number is the footing area – but we need the diameter. The GVW includes the weight of the trailer itself, plus its payload and anything that adds to the total weight. This includes furniture, people, etc. Join 6,470 readers in helping fund MetaFilter. It is always wise to contact a professional to get an accurate estimate of what your deck can safely handle. You must use at least five framing nails to attach the rim joist to the ends of your joists. Let’s say that distance is 14’. It also is not attached to a house, so it has two beams 6’ apart, both with a 2’ overhang. For … 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? That means that the overall structure can support a load of people, or “stuff”, of at least 40 pounds per square foot on top of your deck. On, not in. 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. So I think I'm going to get a pro out there to spec it out. That means half of the deck closest to the house is entirely supported by the ledger board. But our hot tub is 3900 pounds – what do we do? The spa filled has 320 gallons or 2672 lbs. If structural screws were used in conjunction with deck fastening hardware, then it’s likely your deck weight bearing capacity is more than the minimum. 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. The type of lumber used is also critical in determining how much weight your deck can hold. for 7 occupants = 5655 lbs. The next portion is to figure out how much weight this footing is going to hold. Advice for building a back yard cabin,... Atlanta MeFites: Contractor recommendations required! I've never in my life seen a sunken hot tub, though I know they exist. A well-made maple skateboard deck may hold around 220 lbs, but it is still likely to snap if you land incorrectly. Lastly, we’ll 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. Above, we calculated the tributary load of a deck, which tells us how much weight each footing can sustain. Once you know how much the soil beneath a deck can hold, next you can figure out the weight of the deck. Why? Thanks guys... my ladies really want to start hot tubbin' nightly and I want to indulge them, and myself. SYP lumber can span 10’ – 2’ more than the other species. 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. Remember that pi x diameter equals a circle’s area. Below we’ll take a look at the various factors that affect your deck’s strength. How much weight will a .125 inch wood screw support? It would be difficult to verify every last detail of your deck structure to ensure it is up to code, particularly the thickness of concrete footings and soil type. 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. 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 it is simply a matter of finding the area for each rectangle. That being said, most weight-bearing calculators for decks assume a default of 1500 pounds per square foot for soils. Therefore if you have a hot tub that weighs 4500 pounds, that doesn’t mean your deck can support it since that weight is only in a concentrated area. To calculate the weight of the deck, I’ll use a 10×10 deck for this example. Default is 50 psf which you can change. 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 your deck is built on bedrock, gravel, or even sand, then you’ll have a higher – and potentially even a much higher – soil bearing capacity. Understanding the amount of weight your deck beam can hold is, however, only one part of the equation. Mind, you didn't say embedded. The Spa itself if friggin heavy (to the extent of needing to use a crane to lift it onto a 2nd-story deck). 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. Once we find out the appropriate diameter, we can then know if our deck is overbuilt and, thus, capable of sustaining more weight. Can you put a hot tub on a deck? Take a close look at the hardware. Like anywhere from 25lbs to well over 300lbs. For instance, the Upper Peninsula of Michigan has an average snow load of 70 pounds per square foot. 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. Again, knowing your deck lumber species can allow you to see if your deck is overbuilt. Here’s what I’ve discovered: Yes, you can put a hot tub on a deck. 855 lb. (8.35 lbs / gallon). Let’s take a 12×10 foot deck as an example. That way, the weight is divided amongst three footings. A 3 ply 2×8 beam for a deck with a width of 10’ allows for a maximum span of 6’. This calculator determines the size of each tributary area of your deck. A residential deck should be designed to hold 50 psf (40 psf live load and 10 psf dead load). In the case of our deck, we have footings every 4’. 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. water + 1295 lbs. 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. Is there a way for me to test how much weight it can hold? 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. Luckily, we now know how to calculate those loads since we did it a few paragraphs above. Now keep in mind that the deck is meant to sustain that load over its entirety – not in a concentrated area. So a 100 sqft deck would be designed to support 5000 lbs. I want a jacuzzi out there. However, it is highly advisable not to push the 2x4 material up to its limit. Calculating tributary loads is not difficult, as long as you have a diagram of your deck’s framing structure. While accounting for snow load in the U.P. Ask MetaFilter is where thousands of life's little questions are answered. 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. The depth of each structural member will also be a key player here. Figuring Out How Much Your Deck Handle As a general rule of thumb, if you have a deck that’s raised only a couple feet or less, it can support about 100 pounds per square foot. Let's add the dead load of 10 psf to our number and we get 111 psf in the area under the tub. Using cedar lumber for the framing of your deck is perfectly acceptable but way more expensive than common pressure-treated lumber. As well, we’ll show you resources you can use to ensure you are building your deck strong enough. With this size, you can figure that a deck will weigh about 55-pounds per square foot. In that case, you’ll need to know what the average snow load is per your geographic region – a snow load chart helps. 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. 5 will allow you to see if your footing is 3000 pounds recommendations required much the soil beneath... 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Number and we get just over 19” for our purposes, we’ll show you resources you figure.

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