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Re: Query on foundation approach

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Your note indicates that the house is existing as well
as the foundations. So, why is the concern for
differential settlements? Have you noticed any
tell-tale signs?

The north foundations, which are shallow, have bedrock
at 5' depth and the southern caissons extend to the
bedrock. So, the foundations will have very little
settlements, if any. Consequently, I cannot imagine
any differential settlements.


--- Chris Lillback <thedrdirt1(--nospam--at)> wrote:
>  Gentlemen,
> An existing beach house. The residence is underlain
> by 5 to 20 feet of sand over bedrock (north to
> south). The southern 1/3 of the residence is founded
> on caissons in bedrock while the northern portion is
> on spread footings and piers on sand. To mitigate
> differential settlement  what methods of foundations
> or underpinning are available or suggested. Methods
> which would not destroy the existing house or
> structure. Access is very limited. I would
> appreciate any suggestions.
> Chris Lillback P.E.

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