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If you have a freeze/thaw area, absoultley, you should do the very minimum and dig post holes on each corner, just below the frost line, and bell flare the bottoms. Then pour the concrete and tie your island walls into the caison style footing you made. Run latteral rebar through the island every 18".
As far as a dust set patio, I am not at all a fan of dust set, we typically pour a slab then mortar the flagstone to the slab. Alot more work intially, but little to no work replacing grout, shifting stones, etc.
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Bill Schwab
In the year 1491, if the Naturescape Landscape Company did the site work in Pisa, Italy, they would not be calling it the "leaning" tower.
Encinitas, Ca. 92024
www.naturescapelandscape.com
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