How do I build a base for an outdoor hot tub?
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You need to pour a concrete pad. The spa shop should have specs for you to follow along with plumbing, electrical and gas hookup placement too. Check with your local municipality, as in many areas there must be a certain clearance from property line.
Pouring concrete is an art. I honestly would not DIY this unless you have previous concrete pouring experience. And it needs to "cure" a minimum of 30 days before you can place anything on top of the pad.
https://www.everything-about-concrete.com/size-of-concrete-slab-for-hot-tub.html
https://www.hunker.com/13424678/how-to-build-a-concrete-slab-for-a-hot-tub
We made a 6 inch pad reinforced with rerod just like a driveway. We made the cement pad larger than the hot tub.
Here's what we did with our portable. It's light enough that it didn't need a pad:
https://www.frugalfamilytimes.com/2016/08/how-to-make-hot-tub-deck-for-250-and-2.html?m=1
Hi Karen, here are a few ways to accomplish this,
https://www.wikihow.com/Build-a-Hot-Tub-Platform
https://www.youtube.com/watch?v=B2BF7S6zrzM
Here are a few ideas: https://www.google.com/search?client=safari&rls=en&q=bases+for+hot+tubs&ie=UTF-8&oe=UTF-8
Here is a tutorial for you: https://allabouthottubs.com/how-to-build-the-best-hot-tub-base/