Using deck foot anchors under a hot tub

by Kelly
(Edmonton, Alberta)

I am looking at building a free standing deck which will house a 89" x 89" hot tub. I am looking at installing 9 titan deck feet under the hot tub to support it. I will add 3-2 x 8 laminated beams. On top of this I will add a 2 x 8 joist system which will have 2 x 6 decking on top.

I live in Edmonton, Alberta and am wondering if this system will support the tub.

Editor's Comments

Using nine deck foot anchors under the deck is more than enough when you consider that the weight imposed on any given footing is drastically reduced with that many footings.

You can also read more about the deck foot anchor and see if it is right for you.

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Jul 07, 2013
Here is how to figure it out
by: Editor - Rich Bergman

The Titan Deck Foot will perform well for this application given a few parameters. Lets assume the total weight with water and people is 6,000 lbs. That is a lot and its probably less than that. So over 64sqft it works out to about 94psf.

Let's also assume the soil can bear at least 1500 psf. So based on that we need to be confident that no deck foot anchor imposes more than 1500 psf on the soil below it.

You should use the Footing Calculator and also watch the tutorial video.

But based on using 9 footings, 3 per beam, outer beams 1' inset from the edge of the hot tub and one beam in the middle and the outer footings inset 1' from the edge of the tub you will be way below the maximum of 1500psf.

My calculations work out to 350psf on the outer tributary zones and only 450psf on the largest center tributary zone.

Now, keep in mind the parameters.

You have to ensure this is accurate for your location. But the concept remains fairly simple. The more "feet" you have distributing load to the soil, the less load is imposed on the soil by any individual footing.

The other thing to keep in mind is the soil condition. If you have soil laden with rocks or roots the deck foot anchor will have trouble going down. You may have to move the location to find the sweet spot.

It will not work at all if the rocks and roots are everywhere. But in that case neither would a spike style ground anchor and you could not easily remove and reposition spike type anchors.

You would have to dig traditional footings.

The last thing to remember is the Titan Deck Foot is still resting on the surface and is only for floating decks. This is because the large surface plates will sit on the surface and if the soil expands in the winter from frost the deck will rise up with it and settle back down in the spring. You will never even know this is happening because it is so minimal, maybe 1/4" or 1/2" in really moist soil.

But this is fine. It will perform well as it is designed to do this. Bottom line is it is far less expensive than concrete footings which are not necessary in this instance.

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