Steve -- "Urban myth" might not be the best choice of words? The
idea I was hoping to convey is that the manufacturer's recommended
footing design are sometimes interpreted to mean that it is the
one and only solution for all locations. That isn't true. There are a
multitude of different depths, shapes and types of footing designs
that can be substituted that provide the same strength and
stability.
In some locations the manufacturer's design may not work, e.g.,
problem soils, expansive clays, groundwater, sidehill locations.
I'm surprised more manufacturers don't have instructions or
disclaimers to that effect. In other locations the manufacturer's
design will work but might not be the optimal solution for
that particular site.
73 Jim K6OK
Steve N6SJ wrote:
>> Actually, undisturbed soil is not an urban myth, it's just the simplest
way
>> for the engineer to calculate the foundation design. The vertical walls
of
>> the undisturbed soil create friction against the concrete which counts as
>> part of the foundation's resistance to the overturning moment.
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