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cibula11 06-14-2007 07:37 AM

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?

concretemasonry 06-14-2007 09:46 AM

When using Sonotubes, it is not necessary to place a pad of concrete in the hole.

cibula11 06-14-2007 10:13 AM

Thanks!

crecore 06-16-2007 06:23 AM

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.

AtlanticWBConst. 06-16-2007 08:13 AM

Quote:

Originally Posted by crecore (Post 49285)
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? :huh:

http://www.asdcosupply.com/concrete/...foot-forms.pdf

concretemasonry 06-16-2007 09:11 AM

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.


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