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RE: above ground post-tension floor slab

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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 areas

Under the first floor structure to allow rising water to “enter and exit” the crawl space.







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 custom 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 being designed by the soils engineer.  What kind of connection from strip footing to post-tension slab is typically used?  Are typical dowels OK or would the 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 strip footings extending down into undisturbed soil or not (creating a moisture 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