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sonotube how to

9471 Views 4 Replies 3 Participants Last post by  EPERRINGTON
I've never used sonotubes before, but where I live now the building code is recommending a sonotube or like product for the footings of my deck. Frost line is 36 inches so I was planning on digging my hole 48 inches and putting 6 inches or so of rock down first and then the concrete on top.

However, I have seen or read several different opinions on how to install the tubes and by building code office is really giving me anything on how to use them. Place a tube all the way to the bottom of the hole. Place the tube only a foot or so down from grade and fill with concrete. In the second case concrete would be contacting dirt for the bottom 30 inches and then sonotube for the top 12 inches.

What is the preferred method for installing a sonotube? Is there a better method I have missed?
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Opps...forgot the third option I have seen which is more in line to what I have done in the past 5 - 10 yrs ago.

Dig a whole and place concrete in the hole without a tube.

Thanks for the info. I am thinking about using 8 inch sonotubes with a hole depth of 40-42 inches of concrete and around a 4 inch rock base on top of a soil of all clay. Any concerns?

Should I place the tube on top of the rock or pul the bottom up some?
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