How to Build a Hot Tub Platform

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Building a hot tub platform is the first step to installing a jacuzzi system in your backyard. Although this requires quite a bit of effort, it is much less expensive than outsourcing the job to a professional company. You can also pick your own materials to ensure the high quality of the job.

Steps

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  1. If you plan to place the hot tub in a location that was previously lawn, you have two ways to do this. [1]
    • The first is to take an 8 foot (2.4 meters) by 8 foot (2.4 meters) section of lawn out and dig down past the sod to undisturbed soil. Then fill the excavation with gravel and level.
    • The second is to build a deck strong enough to support the weight of a hot tub filled with water and people enjoying themselves. You can use the plan below to construct a hot tub deck in one afternoon.
    • It is a good idea to consult a decking contractor or a structural engineer to make sure that the deck is able to carry the load of the tub filled with water.
  2. Pound stakes in the corners and then measure the diagonals. [2] They should be the same, about 11' 3.5"
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  3. Pound a stake at the center location.
  4. Now you have a cross. Measure 32 inches (81.3 cm) from the center of the cross and pound a stake at these four locations.
  5. Repeat this for each corner. Now you should have 9 stakes inside your 8' square. These 9 locations are where your pier footings will be placed.
  6. The hole should be about a foot deep. The bottom of the hole should be on undisturbed soil. You can use the grass to fill in bad spots elsewhere on the lawn.
  7. You can purchase play sand at most home centers.
  8. Try to make it as level as possible. Make a 15" by 15" template to lay on the sand and check for level in each direction.
  9. Place the footing on top of the sand [3] with the straps aligned with the direction of the beams.
  10. [4] Note that the spirit level shown in the picture is lying on its side for clarity.
  11. You can lay a 4" by 4" post down the middle of the straps to check alignment. [5]
  12. Add enough soil so the ground slopes away from the footing to prevent puddles.
  13. You are now ready to set the posts. Before you set the posts create (3) 4"x6" beams by nailing two 2"x6" 8' boards together. Nail the beams with 10 to 12 16d nails on each side.
  14. The deck will be the post height plus 12 1/2". Determine the first post height. The second post will be the length that is level with the first post. Repeat with the remaining posts checking level from the same center post. Don't nail the footing straps at this time.
  15. This is more easily done on a sawhorse. Do one at a time so you don't mix them up. Mark the beam 16" from the end and place it over the outside posts.
  16. Measure the diagonal from outside corner to outside corner. Adjust until they are exactly the same. Add the center beam aligned with the two outside beams. Tack one nail in each footing strap and one in the beam holder.
  17. for each beam holder and footing straps with galvanized 8d nails.
  18. Check the diagonal to be sure it is square. When you are sure it is square, wrap a string around it and fill in with the remaining joists as shown in the plan above.
  20. You should meet in the middle at 50 inches (130 cm) (see plan). Nail deck boards at each end so that it covers the rim joist. Do both ends. Have your family members nail two 16d galvanized nails through deck board into joists at the 6.25" marks.
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  • Question
    Do I need to reinforce a 6-inch concrete base for my hot tub?
    Community Answer
    Yes, you definitely need to add a rebar to your pour. This will retain the pad if a break does occur in the future and the reinforcement will assist greatly in distributing the weight uniformly to the entire pad.
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  • Question
    If I put my tub on a deck, should I leave space between the tub and deck for air to circulate?
    Community Answer
    Yes, I would recommend this.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
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  • Question
    What are the sizes of the posts and beams?
    Ernie Ayres
    Community Answer
    Pressure-treated 4x4 for posts. Beams could either be treated 4x4 as well, or treated 2x6.
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      Tips

      • Hot tubs weigh about 700 to 800 pounds dry and about 3700 pounds when filled. Placement of the hot tub should be planned well ahead of delivery. The location should be accessible to the 50 amp service most require. Other than that requirement, it should be located where it pleases you. If it will be located on a patio slab you will not need this article.
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      • If you live where the Earth freezes in winter, be sure to think about deeper footings!
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      • A cutoff saw works best for posts and blocking.
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      Warnings

      • Make sure your measurements are precise when completing this project. If the pieces don't line up because of measurement errors, then the sturdiness of your platform will be seriously compromised.
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      • Be careful handling heavy equipment and materials during the construction process. You could seriously injure yourself.
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      • Don't use any ordinary deck plans for a hot tub. They are designed to support 40 pound live load. These plans should support an 80 pound live load plus a 20 pound dead load per square feet.
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      • If you have an existing deck, cut the beam and joist spans in half to provide the additional support. Never try to put a tub onto the structure that was never designed to carry heavy things. It is always best to discuss the installation with a specialist.
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      Expert Interview

      Thanks for reading our article! If you’d like to learn more about hot tub platforms, check out our in-depth interview with Matt Daly .

      References

      1. ↑ https://www.thecoverguy.com/backyard-blast/tips-for-creating-a-custom-hot-tub-pad/
      2. ↑ https://www.todayshomeowner.com/video/how-to-layout-right-angles-accurately/
      3. ↑ https://rogueengineer.com/floating-deck-build/
      4. ↑ https://rogueengineer.com/floating-deck-build/
      5. ↑ https://www.homedepot.com/c/ah/how-to-build-a-deck/9ba683603be9fa5395fab90762ef0cc

      About This Article

      Article Summary X

      The easiest way to construct a hot tub platform is to pound stakes at the corners of an 8 by 8 foot square. Make a smaller square of 9 stakes in the middle. Replace each stake with hole that's 1 foot deep, and fill the holes with a few inches of sand. Place a footing on top and set a short wooden post in each footing. Nail beams across the top going in both directions, and fill in the top of the deck as you go. For precise measurements and ways to make your deck even more secure, keep reading!

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        Jul 22, 2019

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