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Old 06-14-2007, 07:37 AM   #1
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concrete pier


When pouring a concrete pier for a deck footing, do I need to place a pad of concrete in the hole before I start to pour my pier? I was just planning on elevating the sonotube a few inches so that when I poured the concrete it would form a base for the pier. Is this okay to do?

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Old 06-14-2007, 09:46 AM   #2
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When using Sonotubes, it is not necessary to place a pad of concrete in the hole.

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Old 06-14-2007, 10:13 AM   #3
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Old 06-16-2007, 06:23 AM   #4
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actually the advantage of the tube shaped footing is that it resists lift from frost because of not only its depth but it's shape... if you mushroomed a pour out of it you would negate this advantage.
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Old 06-16-2007, 08:13 AM   #5
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Originally Posted by crecore View Post
actually the advantage of the tube shaped footing is that it resists lift from frost because of not only its depth but it's shape... if you mushroomed a pour out of it you would negate this advantage.

Huh?

http://www.asdcosupply.com/concrete/...foot-forms.pdf
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Old 06-16-2007, 09:11 AM   #6
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The resistance to uplift depends to a large degree on the soil type and is not that great for a such a very short pier.

There is a similar situation (reversed) for piling. The soil surrounding piling can settle. The friction between the piling and the soil pulls down and puts more downward pressuer on the point bearing piling.

For deck piers, just put the bottom below the frost line. If you really have bad, bad, bad soil, you can muhroom out the very bottom to gain to bering area and reduce and settlement. - I think Sonotube makes a special base fitting to give you a pretty formed cone.

Sonotubes are far superior to a hand dug/formed pier because of the smooth surface and predictable amount of concrete required.


Last edited by concretemasonry; 06-16-2007 at 12:01 PM. Reason: Addition
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