STEEL PRESSED PILINGS
When less movement of the home's foundation is preferred
When deeper pilings are needed
Like concrete pilings, steel pilings are pushed into the ground.
Steel pilings are usually only 3 inches in diameter, versus 6 inches
for concrete pilings. In contrast to concrete pilings, which have
a rough surface, steel pilings have a smooth surface. Because of
the differences in diameter and surface texture, driving a steel
piling into the ground takes less than 1/5th as much pressure as
driving a concrete piling. As a result, the installation process
for steel pilings often (but not always) results in much less movement
during the installation process than the movement that occurs with
concrete pilings. Unless a piling hits rock, a steel piling will
always go deeper than a concrete piling, for a given amount of pressure.
Steel pilings cause less movement during installation than concrete
pilings and typically go deeper than concrete pilings, so why not
always use steel pilings?
· The first reason is cost. Steel pilings can cost twice
as much as concrete pilings. If soils are suitable for concrete
pilings, why spend the extra money on steel?
· The second reason has to do with corrosion. Some soils
will eat up steel over time. For example, nobody would suggest using
steel pilings in Galveston, where the ground water is salty.