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RE: above ground post-tension floor slab -FLOOD

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>>> dfisher(--nospam--at) 8/16/2006 2:34 PM >>>

> Be careful about the detailing of the slab and foundation wall.

> When I did homes on Cape Cod, we had to detail openings and open

> Under the first floor structure to allow rising water to "enter and
> the crawl space.

OR, the structure must be designed to resist hydrostatic and
hydrodynamic forces. Check the FEMA guidlines.

Suresh Acharya, S.E.







David L. Fisher SE PE

Senior Director


Cape Cod Grand Cayman Holdings Ltd. - Cayman

Fisher+Partners Structural Engineers Ltd. - Cayman

372 West Ontario Chicago 60610

75 Fort Street Georgetown Grand Cayman BWI

319 A Street Boston 02210




312.573.1726 facsimile

312.622.0409 mobile 






From: Mark Pemberton [mailto:markpemberton(--nospam--at)] 
Sent: Wednesday, August 16, 2006 12:38 PM
Subject: above ground post-tension floor slab


I have a client who wishes to use a post-tension floor slab for a new
home.  Her lot is in a flood plane so the building pad needs to be
built up
30 inches.  I was planning on using a tall strip footing around the
perimeter with an engineered fill to accomplish this.  The slab is
designed by the soils engineer.  What kind of connection from strip
to post-tension slab is typically used?  Are typical dowels OK or would
tensioning process be problematic for this condition?  The soils for
building up the pad are required to be local material which is
moderately to
severely expansive, so I'm not sure it's OK to not use any perimeter
footings extending down into undisturbed soil or not (creating a
break).  Thanks in advance.

Mark Pemberton, S.E.

Pemberton Engineering 
502 Mace Blvd., Suite 2B 
Davis, CA 95616 

Ph:  (530) 792-0511 
Fax: (530) 792-7109

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