What's the Best Hot Tub

Author Topic: Foundation question  (Read 3876 times)

cheezling

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Foundation question
« on: June 29, 2005, 11:17:06 am »
I have an 8'x8' hole dug that's 12" deep at it's shallowest point ready for the foundation of our hottub. My question to you guys is this:  What's the best/easiest/most cost effective way of making this? My plan was to put 8" of 3/4 gravel on the bottom, then 4" of concrete on top of that. Then someone asked me if I could use compacted pea gravel in place of the concrete. Then I heard they have heavy-duty plastic bases (like you'd have under your outdoor air conditioner). I'm guessing it would cost me a couple hundred for the concrete, whereas the gravel would be cheaper...maybe I could use the plastic base on top of the pea gravel? Any input is greatly appreciated!

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Foundation question
« on: June 29, 2005, 11:17:06 am »

Brewman

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Re: Foundation question
« Reply #1 on: June 29, 2005, 11:33:14 am »
Concrete.
Brewman

Spatech_tuo

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Re: Foundation question
« Reply #2 on: June 29, 2005, 11:38:31 am »
I've seen pea gravel used effectively many times. I'd suggest you frame around the hole with PT wood (you can paint it the same color as your spa's base) and then fill it with the pea gravel to help contain it. Having said all that, concrete is still a great way to go but either way would work.
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jsimo7

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Re: Foundation question
« Reply #3 on: June 29, 2005, 11:51:17 am »
You will like concrete much better 10yrs from now

autoplay

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Re: Foundation question
« Reply #4 on: June 29, 2005, 12:51:09 pm »
No brainer,concrete.  8 by 8 not real big,so cost factor shouldn't be a variable involved.  Most of your "do it yourselfers" could easily mix and pour that amount,and rod it off,in a day.

Do you plan on doing the work yourself,or contracting out?

P.S. ... If you do it yourself,you can scribe your initials in it ;)

cheezling

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Re: Foundation question
« Reply #5 on: June 29, 2005, 01:22:29 pm »
Yeah, we planned on doing it ourself. We already talked about putting all our handprints along with the dog's pawprint in the crete :)

So should we use that wire mesh as reinforcement? or rebar? and should a slab that small still be scored to control cracking?

Thanks again, especially for the quick input!

ebirrane

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Re: Foundation question
« Reply #6 on: June 29, 2005, 03:07:13 pm »
I built my own slab, with about the same proportions.  Here is what I did, maybe it will help in deciding what you should do. Our slab has been around for about a year with no problems.

1) I dug an 8'x9' hole, 8" deep.

2) I then dug 1' "footers" an extra 4" deep all around the slab. This will, supposedly, help decrease slab movement over time.

3) Tamped the ground with a hand tamper, $8 at home depot.

4) Poured 4" of drainage rock. Tamped it by hand.

5) Spread some plastic sheathing over the rock.

6) Made concrete forms out of wood, made sure they were square.

7) Built a mesh out of 1/2" rebar, every foot.  It came up to 6" from each edge of the patio. Found that cutting rebar by putting a metal-cutting blade on a mitre saw is fun, and sparks are mildly painful.

8 ) Bought a bunch of "rebar holders", which hold the rebar up a few inches, otherwise, the rebar will sink in the wet concrete.

9) Had a concrete company deliver mixed concrete, which me and some friends wheelbarrowed to the slab. Had it aerated and had fiberglass support put in. Ask the local concrete dleivery people, they will recommend what to use for the slab in your area.

10) Smoothed it and screeded it was a long, straight 2x4.

11) Kept the top wet for the next 5 days. This involves watering it and keeping hay or newspaper or something else on top to keep the top from drying out.

12) knocked down the wooden supports.

No expansion joists.  Digging and leveling the dirt was, by far, the hardest part.  The manual labor was done over 2 weekends (1 weekend digging, 1 weekend for rocks and forms and concrete).  We took our time. I'm sure it could have been done in a single weekend.

Look to get drainage rock in bulk and not by bag, you can save a bundle and use the extra is different places in your yard if you like the look.

Hope this helps!

-Ed
« Last Edit: June 29, 2005, 03:11:44 pm by ebirrane »

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Re: Foundation question
« Reply #6 on: June 29, 2005, 03:07:13 pm »

 

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