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RE: Column located on 4" existing concrete slab

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I’ve had trouble in the past getting Geotechs to give me an allowable soil bearing pressure at an embedment of “0”. Maybe Britney Spears will give you a better value :o).




T. William (Bill) Allen, S.E. (CA #2607)

V/F (949) 248-8588

San Juan Capistrano, CA


-----Original Message-----
From: Stanley E Scholl [mailto:sscholl2(--nospam--at)]
Wednesday, October 29, 2003 7:05 PM
Subject: Re: Column located on 4" existing concrete slab


I believe this will be OK, especially if you can distribute the load a little by using a base plate of about 6"x6"- if the slab is on reasonably stable compacted soil.

If you need to calc. it to satisfy the building dept., I have successfully used concrete pavement techniques. For example a 6" concrete pavement can support 8 kip wheel loads if on decent subgrade.


Stan Scholl, P.E.

Laguna Beach, CA


On Wed, 29 Oct 2003 16:37:53 -0800 (PST) ken kirkland <kenmail234(--nospam--at)> writes:

I have a balcony size 14'x4' supported by two column.  I estimate about 700# D+L loads will transfer to 4x4 post.


Can I place this column on top existing concrete about 4" thick?  If not, what is the correct procedure.



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