The Denning's website describes their ongoing home improvement projects including a typically detailed description on building a deck using Bigfoot. The new, 26 x 9.5' structure replaces a 3' x 5' porch original to the house.

Quotes from the Dennings' website:
"The second picture shows an 8" sonotube attached to a Bigfoot Systems BF24 high-density polyethylene (HDPE) footing form. The Bigfoot and sonotube were assembled as a unit, then lowered into the hole over the rebar grid shown in the previous picture.
"Since we had to dig large holes anyway, it seemed reasonable to use the Bigfoots for a number of reasons:
Unlike wood, the HDPE form remains in place after the footing is poured.
The large footprint offers good load-bearing properties in our poor soil conditions.
Finally, the shape and large size also offers a high resistance to frost jacking, especially important since the deck isn't attached to the house."