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skybsd
sage
Reged: 02/01/08
Posts: 291
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Questions about Sonotube based piers
07/03/08 05:12 AM
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Hi,
I guess this is a question to those that have used sonotube (or similar solutions) in building their concrete based piers...,
To start off.., I know nothing about concrete and construction in general - and my building skills are "self-hazardous" at best 
However, in planning my concrete pier, a couple of things I'm struggling with in reading other people's notes on the construction of their concrete piers concern me, and I'd appreciate some clarification from you guys that have poured your own piers, please..,
The "givens":
a] Sonotube length = 5ft
b] Hole = 2ft x 2ft x 2ft
c] Rebar = 4 rods
Questions: -
1] Is the sonotube placed straight down, to the bottom of the hole - so that the base is flush with the bottom surface of the hole?
I'd have thought not, but maybe you know something I don't?
2] Sonotube (and others) have the outer lining skin that you peel off after the concrete is set. Given that you can only then peel off what is visible above ground, are there any concerns about the remaining skin that is still below ground?
3] Regardless of [1].., because there IS the outer skin that remains in place below ground, the concrete that been poured inside of the tube does not (all) meet, nor bind to the concrete on the outside of the tube.
Doesn't the resulting pier end up being a (mostly) separate (granted made of concrete) pole that's slotted into a "concrete block with a hole in the middle"?
As I said, knowing nothing about this stuff, I accept the fact that there's some glaringly obvious point that I've missed in all the posts that I've read. Please fill in the blanks 
Thanks, guys / gals!
Regards,
skybsd
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