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Pedestal
Post Laureate
Reged: 03/11/06
Posts: 3070
Loc: Smoggy Bottom, Baytown,Texas
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Re: Questions about Sonotube based piers
07/03/08 07:17 PM
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There are several ways to skin this cat, and a lot depends on what you want to wind up with in the end.
First, think of a 2 part pour as a single, extended pour. You pour your base, then you setup your sonotube, fastening it securely in place, level and square, with the bottom where it meets your base concrete well caulked. Your rebar should be in the base part and extend up inside the sonotube. (how many, how big, is not that important) As the base begins to set, it will reach a point where it seems pretty solid, but is easy to scratch. At that point, you pour the pier, vibrating (tap with a hammer) all the way up. Don't wait until the sonotube is full to start the vibration process.
Do you want the base to be level with the ground? Or do you want the base to extend up perhaps to the level of a deck above ground? In EITHER case, you are going to have to build some kind of structure around the base hole to secure the sonotube.
Keep in mind, the easiest way to ruin concrete is to use too much water. Follow the mixing directions on the bag. It also does not hurt to buy an extra bag or two of concrete (not Readymix) and add a shovelfull to each bag as you mix it.
Just some thoughts you might find helpful.
Hubert
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