The majority of hot tubs need approximately 4” worth of concrete slab. Hot tub decking is exactly the same as all other decking – the difference is in the construction of the timber deck. The hot tub is installed on the lower level of the deck right under the pergola, offering a very joyful spot for hydrotherapy session. That is a total of 4,322 lbs. A new platform with large footings at least 22" in diameter should be installed below each corner of the tub … I had in mind that I would use 4x2 CLS joists @ the 2.4m spans (300 centres) with around 20 4x4 treated posts concreted in and in particular around the area the tub would reside. (average 150 lbs). I appreciate your info. The hot tub deck must therefore be carefully constructed and supported properly by blocks and beams secured in the ground. Or, if your deck has many angles, additional footings are necessary. You can use the plan below to construct a hot tub deck in one afternoon. The answer for hot tub people is both; sitting in a hot tub while out on your deck. I am looking to add a 2 person hot tub on my deck. Note: The supporting structure of the deck can most likely be modified to take the additional weight of the hot tub or spa. It is usually only necessary to add extra structural support to the area under the hot tub or spa, not the entire deck. This top tips for building hot tub decks post is from the experts at Real Cedar.com,. Can A Deck Support An Inflatable Hot Tub? Download a hot tub buyer’s guide to learn more about our models. But the fact is that your average deck isn’t built to support a hot tub full of people and water. The spa filled has 320 gallons or 2672 lbs. The property is sloped so closest to the house, the deck will be only 12" high … Never place a hot tub on an existing deck that wasn't designed to support the massive loads. Of course, this isn’t something you’ll want to guesstimate. Even inflatable hot tubs can still weigh up to 3,700 lbs full of water and people. Do not forget that a deck for a hot tub must not only support the tub itself, but also the water, and the weight of the people who are bathing in it. But let's take into consideration the reality of it all. Greg's hot tub was 8'x8'. The hot tub will add about 100 PSF load to the normal live and dead loads. I’m to build a raised deck frame which will support a small (1.8m Lazy Spa hot tub). That said, it’s important to seek the help of an expert when it comes to installing a hot tub on a deck. Measure a square using stakes and string on the ground. It is always wise to contact a professional to get an accurate estimate of what your deck can safely handle. It is usually only necessary to add extra structural support to the area under the hot tub or spa, not the entire deck. A 7’x7’ hot tub can be somewhere in the range of 1,000 lbs empty. The hot tub place said I should build some type of wooden frame into the gravel so the tub … Not all decks can support a hot tub! My spa started off at 600 lbs. Install a concrete slab for the hot tub platform. Raised Deck Hot Tub Pressure-treated wood is critical since the deck will be exposed to rain and the water from the hot tub, and pressure-treated lumber resists damage and deterioration from exposure to water or moisture. I am building a 10'X11' deck to support a hot tub. Next, drop your hot tub into the deck. Before building a hot tub deck, however, the builder must consider a few factors: first, do I need a building permit? It's ideal. If you’ve been using a bathtub on the deck and want a hot tub on a deck, you’re in the right place. I need to elevate a hot tub 3'6" on a 8'x8' platform. I'm thinking of using 2x12 joists 12" on center. Hot Tub Buying Guide Support your hot tub on a deck. Also, putting extra 4x4 posts under each corner of the hot tub… Note: The supporting structure of the deck can most likely be modified to take the additional weight of the hot tub or spa. Now multiply that 40 lbs psf live load by 49 sq ft of deck and you get a total of 1,960 lbs -- that’s what the average deck built to code can theoretically support. This includes the wind patterns in the area, proximity to leaf shedding trees and bushes, the amount of sunshine received, space for the hot tub cover and accessibility and privacy issues. As hot tubs have become increasingly popular to install in gardens across the country, decking has become the platform of choice. Mixing a deck and a hot tub can truly create some amazing places to hang out and soak but what does it take for a deck to support a hot tub? A hot tub on the deck. However, if the deck is more than 2 feet off the ground, it will likely need additional support to hold the weight. Viewed 62 times 0. (8.35 lbs / gallon). 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