It’s a good idea to reinforce the concrete with some. The weight of the swim spa will cause the crushed stone to further settle, so you need to keep an eye on it to make sure it stays level. To learn more about swim spa installation requirements, download a swim spa buyer’s guide. Putting hot tub on sloped concrete slab. It’s often suggested that concrete pads be at least four inches thick, but this will also depend on the size of your swim spa. Posted 1 month ago. The concrete slab will usually be about 150mm inches in depth, and very slightly (40mm or so) larger than the dimensions of your swim spa in length and width. Almost anything that is solid can be used as a shim. To start with you’ll need a stable, flat and level area on which to place the tank. If the conditions are right, these can make an effective base for a swim spa. A reinforced concrete slab (min 150mm) is recommended. Home » Blog » Do I Need a Concrete Pad for a Swim Spa? Concrete slab. Job description. It is best to have a little excess concrete in your slab so you have a little extra to work with which will make for a more uniform finish. Curing must start the same day – as soon as you have finished the surface. All spas require a sturdy foundation. Because they may already exist, quite often swim spas are installed on paving blocks. The pad size would be 2400mm x 3070mm and I will dig the ground down to the desired level to fit the slab. Another way to cut down on the cost of pouring a concrete slab is to use a prefabricated pad. Information about the installation of a Spa or hottub.. foundation: if you choose to pour a concrete slab, make it at least 10 centimeters thick.. be connected to two power generators who have to be grounded separately and must include. You just need to pour a layer of concrete that’s level and of the necessary thickness to withstand the weight of a swim spa. (However, if you choose to construct your spa on a raised wood deck or other structure, instead, it is strongly suggested you check with a trained structural engineer or contractor, first.) Technically, the metal in the concrete is "bonded" rather than grounded. You just need to pour a layer of concrete that’s level and of the necessary thickness to withstand the weight of a swim spa. Prior to the slab being poured, I told the homeowner to contact me before that happens so I could come by and clamp a piece of #8 bare to the rebar. A swim spa weighs a whole lot more than what most people expect. The concrete slab for the hot tub would need to be a minimum of 4 inches or 10cm's thick, ideally 6†or 15cm. The details are these. To see our BonaVista COVID-19 policy, please click here, Pools, Hot Tubs, Patio Furniture, Outdoor Living. The swim spa is 2.3m You can fill the area with crushed stone, pack it down and make it level to create a space onto which you can put your swim spa. The reason that concrete pads are consistently used as a base for a swim spa is that they can be constructed to the exact specifications needed. Step 1 - Mixing the Concrete for Concrete Slab. Tradespeople. All Rights Reserved. Very large tanks could require a thicker pad. All rights reserved. | Privacy Policy | 105 Vanderhoof Ave, Unit 4, Toronto, ON M4G 2H7. It may be possible to use an existing deck or build one specifically for your new swim spa. Installing a Hot Tub is Less Expensive Than You Might Think! (no it won’t cause the slab to crack). Copyright 2021 © Clearwater Pools & Spas. The concrete slab for the hot tub would need to be a minimum of 4 inches or 10cm’s thick, ideally 6” or 15cm. Not only does it make the water easily accessible, but it also provides protection from dirt and debris ending up in the water. West Broad Store: 804-747-7757. This article will go over the reasons why a concrete pad is often preferable as well as some of the alternative bases that can be used. Step 1 Stake out the perimeter of the slab you want to pour. A swim spa must be placed on a flat, stable and level surface. The slab is 4m by 4.8m and 100mm thick. You’ll need to do some prep work beforehand to create the flat and level space required for swim spa installation. If you choose to place your hot tub on a concrete slab, you''ll have to build something more substantial than a normal 4-inch concrete pad, due to the weight. This may come in the form of a concrete pad, paving blocks, a crushed stone base, a prefabricated swim spa pad or simply placing the swim spa on a reinforced deck. In terms of the overall dimension, we recommend at least 600mm extra on each side of the swim spa meaning that the minimum pad size should be 1200mm larger than the swim spa itself. If it isn’t completely level, the resulting water pressure will, over time, cause the walls of the swim spa to collapse. Concrete Pads. Usually a concrete slab made to building code is suitable to hold a hot tub. Your email address will not be published. ! Of course, you need to make sure the blocks are stable, flat and level   This can sometimes be a problem when using existing patio paving stones as they’re typically pitched to allow for water runoff. A water-filled, six-person hot tub can weigh upward of two tons, so many homeowners position their tubs on concrete pads instead of setting them on wood decks. Congratulations on your decision to buy a swim spa! If you have an existing patio made of concrete bricks, make sure it’s in good condition and is level (not angled for drainage). The amount of water needed to fill the tank is not insubstantial by any means. However, the concrete pad is probably the most reliable and longest lasting of the group. You can put some bricks under the rebar to make sure it is in the middle of the slab. closed. You may wonder, “Do I need a concrete pad for swim spa?” or “Will I be able to incorporate my existing deck?”  In this article, we’ll answer these questions and others related to installing your own personal swim spa. The ability to soak and swim in a small space makes this economical investment a preferred choice among urban dwellers and busy professionals alike. As the name suggests, concrete pads are a slab of concrete onto which you place the swim spa. HomeAdvisor's Concrete Slab Cost Calculator gives average installed concrete costs per square foot or size (30x30, 24x24, 40x60) for garage floors, sheds, backyard slabs and more. Hi, I’ve had my spa since the summer, about 7 months now, and we’ve found those sponge things seem to work at keeping the foam from. You’ll be able to choose a size that’s custom built for the swim spa and you’ll be able to ensure that it’s level and has the appropriate thickness. Estimate the labor price to pour concrete vs. buy precast cement pads. I need a concrete slab for spa pool, about 4x4m, needs to be retained at least one side, maybe one and a half. If the slab is not leveled, parts of the spa may not be supported, and all the weight of the water may break the spa. When neither an existing deck or patio are useable for your new hot tub a lot of times the best option is a poured concrete pad. Had great ideas and amazing prices these guys definitely know what they're talking about Can’t wait to share my driveway before and afters with everyone so excited Thanks again guys!! Many swim spas these days are composed of two separate tanks – one designed for swimming and the other used for soaking. This is especially important for larger hot tubs. Chester Store: 804-530-9000 As you probably well know, swim spas are becoming more and more popular these days due to their compact size, relatively low maintenance and flexibility compared to full-sized swimming pools. It can be formed in many shapes, the minimum thickness we recommend is 4 inches with rebar reinforcements. Never be tempted to install directly onto the ground or grass, as these surfaces are not solid it will settle into the earth and become uneven. My coworker has a 12 foot slab off the patio door of his basement, on which he wants to put a hot tub. The fourth cable, the ground cable, is 6-gauge. Posted 3 years ago. Hi, we are interested in getting a swim spa to go on top of an existing (reinforced) concrete slab. Crushed stone bases have the added benefit of allowing water to run off without affecting the levelness of the base. This allows you to ensure the area where the swim spa is placed is perfectly level while allowing for a pitch in other areas to promote water runoff. Courthouse Rd Store: 804-745-7674 Whether you’re using your swim spa for swimming or soaking, you’ll need to assess your situation in regard to installation. This is more than strong enough to support an 18-foot by 4-foot-deep round pool. We would like to get a spa pool and require a 100mm thick concrete slab to poured between two existing slabs - pictures attached (spa weight up to 2000kg). You’ll want to put your hot tub on an elevated foundation, which should be a 3” concrete slab. We’ll go over these various bases to give you an idea of what you’d be looking at when it comes time to lay one down. « Reply #14 on: June 08, 2007, 09:01:08 am » as i recall, when i was looking at a sundance booklet that described how to get ready for delivery, i believe that there was a mention of spa pads as not advisable. Concrete Pad. Curing provides a continuous supply of moisture to ensure a better surface quality and a stronger slab. When a swim spa is full, it often weighs more than 9 tonnes. For a hot tub that is going to stay in place for a long time, I would use the scrap metal. How to Pour a Hot Tub Pad. Re: spa pad or concrete slab? They can also sink or buckle over time which can affect the evenness. Construction & Service: 905 475 6980, Copyright © 2011-2021 BonaVista. For most Caldera spas, including the 8-person Cantabria®, a concrete slab is a must. This means removing any grass and digging down about four to five inches into the ground before leveling it out. This stops drawing the water up and out of the concrete too soon. Concrete Slab for Spa Pool. It’s best to enlist the help of a structural engineer to ensure using your deck won’t pose any problems. We recommend pouring your concrete slab 3-4” thick using a 2”x6” wooden frame to create your form. How long you wait for this to dry is entirely weather dependant. On top of the foam board or ground if you don’t put down foam board, put down a wire mesh layer. A concrete pad is great because you can get it to set perfectly level and it creates a nice solid base for the spa. We are often asked how much you can save by using EZ Pads instead of concrete for a hot tub or spa foundation. Thoughts? With some advance preparation, delivery of your new hot tub will be a … Required fields are marked *. CONCRETE A concrete surface is an excellent base for your hot tub as this material is extremely sturdy and long-lasting. The base of the concrete slab concrete should be about 4 inches thick. Such a pool contains about 30,000 gallons, and that amount of water weighs about 125 tons, exerting a pressure on the slab equal to about 4 pounds per square inch. Often, we come across new swim spa owners who already have a stone patio laid in their backyard. A customized poured concrete pad is an even better choice. If it’s too difficult to work with an existing set of patio stones, you might consider removing them and laying a fresh set. Very large tanks could require a thicker pad. If it isn’t completely level, the resulting water pressure will, over time, cause the walls of the swim spa to collapse. Although a slab made of multiple blocks is acceptable, a single slab is preferred because it is more durable. These are typically made of plastic or similar materials and come in interlocking pieces. The preciseness at which concrete pads can be laid makes them very attractive bases for swim spas. Nice job, good luck with your new tub. However, many patios and other concrete slabs are pitched for drainage, which may make an unsuitable base for your hot tub. Your email address will not be published. Run twine between the stakes. To find out more about swim spa installation, download a swim spa buyer’s guide. Because this is a potentially dangerous situation, having it installed correctly can literally mean the difference between life and death. When it comes to installing a swim spa we often get asked, “Do I need a concrete pad for swim spa?” The fact is that it’s not completely necessary. Our lifetime guaranteed EZPads cost only $349 + s/h, so the answer seems to be that you can save anywhere from about $200 to $800. If this is the case, that pitch must be rectified before the swim spa is placed on them. However, most patio paving stones are pitched to allow water to drain away properly. I won't remove the framing wood until Wed. or Thurs. Your email address will not be published. Because this is a potentially dangerous situation, having it installed correctly … Although they’re not a permanent solution they can be good for a quick and cheap installation. The spa must be placed on an approved level surface. Slabs for hot tubs generally are 8 feet by 8 feet. Even a low-strength, 4-inch concrete slab can withstand a weight of 1,700 kilograms per square centimeter, or 24,123 pounds per square inch. You'll need footings much like the foundation of a house. Email: info@bonavistapools.com Is there any solution to leveling the slab, short of breaking and pouring a new one? Cheers Shea . The reason that concrete pads are consistently used as a base for a swim spa is that they can be constructed to the exact specifications needed. The slab thickness should be 6", use 4000 psi concrete, you do not need footers. We recommend 150mm of reinforced concrete. Concrete slab for spa pool. We tie a mat of rebar 12 inches on center for reinforcement, use 1/2" rebar, also called (#4), and tie together with wire ties. A large, heavy spa requires a concrete slab base that is at least 4†thick. Thanks! They also have the benefit of doubling as a hot tub. CURING THE CONCRETE SLAB (PROTECTING THE SURFACE AGAINST MOISTURE LOSS) Moisten the surface and edges of the slab using a hose on a gentle spray twice daily for 7 days. General Concreting Titirangi, Waitakere. A concrete slab is the most durable, stable and most recommended foundation for a spa. Swim spas are quickly becoming very popular backyard additions. Retail Store: 416 645 6980 That said, if you have an existing deck, you’ll need to make sure it has the capacity to handle the weight of a full swim spa. They benefit people who like to practice their swim stroke in the privacy of their own home without requiring the amount of space or maintenance needed for a full-sized swimming pool. At least a 6” thick concrete slab using 3000lb or 3500lb concrete. Highly recommend the guys at TCB Had a concrete slab laid for my swim spa and the job was done so fast, recently they came back out to quote a new driveway. Just like crushed stone bases, you’ll need to dig down about four or five inches and level the ground before installing. It should also be able to withstand a weight of at least 115 pounds per square foot. It’s often suggested that concrete pads be at least four inches thick, but this will also depend on the size of your swim spa. Job description. In cold climate areas lay down a 1” or 2” layer of closed cell foam board under the hot tub area of the slab. The problem is - the slab has a slope away from the house. A portable spa requires a structurally sound base – typically a level, reinforced concrete slab or decking. It’s best to seek the advice of a structural engineer who will be able to tell you if your deck is strong enough, or what you can do to make strong enough, to hold a swim spa. Spa electrical box was installed and I ran 1.25" electrical conduit from it to the slab; I ran three 4-gauge copper electrical for my two hots and single neutral. Next, use a magnesium (mag) trowel. A flat slab will support the bottom of the spa evenly. It’s not hard to see why decking is one of the most popular bases for swim spas. Required fields are marked *, Email: info@shopclearwaterpools.com It took two yards of 2500psi concrete to poor the slab and the sidewalk. So far in this article, we’ve given a bunch of alternatives to using a concrete pad as a base for a swim spa. This outdoor spa sits on a concrete slab and the spa butts up against a composite deck, the top of the spa is flush, or is very close to being flush, with the surface of the spa. As the name suggests, concrete pads are a slab of concrete onto which you place the swim spa. Beyond all the home and gardening magazines that feature hot tubs and swim spas perched on wooden decks, there is a lot of appeal in having a smooth and uniform surface surrounding your new installation. Installing an above ground swim spa is the easiest installation process available. As such, it needs a very firm base. That said, you’ll still need to prep the ground before you lay down the pads. Your email address will not be published. closed. Some steel reinforcement should be left exposed to allow the electrician to bond the spa to the concrete slab. The nuts and bolts procedure is to connect, and provide access to, a ground wire to the metal mesh or rebar within the slab - this wire will be connected to the common bonding point within the spa once it is installed. However, there needs to be prep work done to the ground before laying down the crushed stone. If your deck can’t hold several thousand pounds of weight, you’re looking at a potentially dangerous situation. While it is the most expensive of the four options shown here it is by no means unaffordable. This may require re-leveling the ground or even digging up the paver stones and resetting them to be perfectly level. If you’re not willing or able to lay a brand-new concrete pad for your swim spa, you can create a base out of crushed stone. Additionally, the concrete should be fully cured before placing your hot tub down. That said, most decks aren’t built to withstand the weight of several hundred gallons of water. Warning: This form can only be used if JavaScript is enabled in your browser. A swim spa must be placed on a flat, stable and level surface. Hot Tub Slab is in Good Condition From there you add and pack down the crushed stone to create the surface on which the swim spa will sit. Save my name, email, and website in this browser for the next time I comment. This involves digging up the grass and topsoil and digging down a further four or five inches. Done to the concrete pad is great because you can save by using EZ pads instead concrete. To stay in place for a swim spa is full, it often weighs more than what most people.. 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