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dskordas

03:09PM | 08/25/06
Member Since: 08/24/06
4 lifetime posts
Bvlawn
I am planning on installing a hot tub which measures 7'5" x 7'5" at it's base. I've excavated an area about 8' x 8' to a mostly level plane, (my yard has a slight slope to it.) I would like to build a wooden foundation for the tub, while maintaining a slight slope, for drainage. the foundation need only be a few inches off the ground, (the shorter, the better!)

1. What types of wood are acceptable?

2. What types of supports, (and how many) are required?


dskordas

03:49PM | 08/25/06
Member Since: 08/24/06
4 lifetime posts
...I'm including a picture for reference. The cinder blocks and cement pavers are to prevent the surrounding dirt from falling.

On the left, you can see that I have gone about a foot below grade.
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dskordas

05:09PM | 08/25/06
Member Since: 08/24/06
4 lifetime posts
pic
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fool4jesus

09:34AM | 08/26/06
Member Since: 06/20/05
53 lifetime posts
I have not done this, but I think most people would use concrete or bricks for such a low foundation. When I built our deck w/ hot tub, I wanted the bottom of the tub about 18" off the ground. This is probably too high for you, but I figure I'd tell you what I did anyway.

It would have taken a LOT of concrete, so I built a small deck using normal construction techniques. The joists are all 2x12s, with two double 2x12 beams. Each beam has 6x6 posts sitting on 2' square footings (required by code), so 4 posts total. If you make wide footings like these, make sure to make a tic-tac-toe board of rebar across the bottom of the footing, otherwise it may crack. This sucker is solid, believe me - but we are talking a lot of weight. (My tub is 5500 pounds.)

Whatever you end up doing, if you're using wood, make sure any wood that touches the ground is rated for ground contact, not just plain old pressure treated. Most 4x4s and 2x lumber are not rated for ground contact. I had to go to a real lumberyard (not one of the big box stores) to get ground contact rated 2x12s. Otherwise, you will be looking at rot. It'll say on the little tag on the end if it's treated for ground contact.


Altereagle

08:33AM | 08/30/06
Member Since: 12/27/02
543 lifetime posts
In this case you would be better off to place a slab for the tub.

I see that you have undermined the pier for the deck so I remove those stone blocks and place a proper retaining wall in that location.

You can do that in a monolithic pore.

I would also mix in a dye to match the stone for the retaining wall sections.

Then I would build in a lower deck, and tie in the upper similar to the image below.

With this one I dyed and stamped the concrete to look like river rock. I also put a planter in all of that was done in one pore.

Alter Eagle Construction & Design

http://www.altereagle.com/ | Construction & Design | http://decks-ca.com/ | Decks, California outdoor living | http://kingofcrown.com/ | Molding and finishing | http://installcrown.com/ | Crown tutorial


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Altereagle

08:38AM | 08/30/06
Member Since: 12/27/02
543 lifetime posts
Here is another view.

You see how I framed over the slab so you don't see it?

Also you can see in the back where I stepped up to a higher deck, a seat and extra eterior storage.

This is similar to your situation, and may give you some ideas?

Alter Eagle Construction & Design

http://www.altereagle.com/ | Construction & Design | http://decks-ca.com/ | Decks, California outdoor living | http://kingofcrown.com/ | Molding and finishing | http://installcrown.com/ | Crown tutorial


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dskordas

07:34PM | 08/30/06
Member Since: 08/24/06
4 lifetime posts
That looks quite attractive, and very well built!

My situation involves nearly all of the foundation being below grade, (underground).

I'm trying to avoid using any concrete at all, but rather just build a wooden foundation for the tub.
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