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Re: Column located on 4" existing concrete slab

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An exterior surface supported by two columns and a beam on one side and the
structure on the other is technicall clasified as a "deck", and the load
matches the load on the adjacent structure.

A balcony is cantilevered without separate supports, and has higher loads.

Jason Kilgore
Leigh & O'Kane, L.L.C.
816-444-9655 (FAX)

----- Original Message ----- 
From: Aswin Rangaswamy
To: seaint(--nospam--at)
Sent: Thursday, October 30, 2003 12:33 PM
Subject: Re: Column located on 4" existing concrete slab

Pl. check you loading again.  If using the UBC the LL on exterior balconies
is 60psf

Trib. area on column = 14'/2 x 4'/2 = 14 SF

LL = 60 psf x 14 SF = 840 LB

Generally the slab poured outside are not properly compacted and reinforced.
I would caution against placing on the slab.  Base plate is a good idea.
Imagine kids (older ones) jumping up/down at the balcony!

A cheaper alternative might be to use foundation blocks available at Home
Depot.  Cut slab, dig hole, place foundation block, attach post to block -

-  Aswin
Aswin Rangaswamy, P.E.
Structural Engineer
Jacobs Facilities Inc. ( )
(714) 503-3772 (P); (714) 503-3865 (F)

----- Original Message ----- 
From: ken kirkland
To: seaint(--nospam--at)
Sent: Wednesday, October 29, 2003 4:37 PM
Subject: Column located on 4" existing concrete slab

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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