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    Rebekka O'Melia

    Friction piles are used in sandy/silty conditions where the soil shifts easily.  Sites like a river bed.

    The slab is easily used on rocky sites.  

    And a full foundation wall is needed in areas where the frost deep is deep.  Footings are designed to spread the load of the building across a larger area, based on whatever the soil capacity is.

    Hope this helps.  Maybe review the Fundamentals of Construction book.

    Rebekka O'Melia, R.A., NCARB, B. Arch, M. Ed, NOMA, Step UP ARE 5.0 Courses

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