How does a “helical pier system” work?

Q: A local construction company offers a “helical pier system” when building a deck. How does this type of system work?

 

A: Helical piers are steel foundation pins that are driven into the earth below the frost line. Installation requires expensive hydraulic machinery (i.e. a skid steer or excavator). The system is often used in commercial construction, but is gaining popularity for deck construction in smaller areas and on tricky sites, such as steep inclines or poor soil conditions, where it is otherwise difficult to dig footings and pour a concrete foundation.

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No matter what material is used for the surface of a deck, the substructure is likely to be built with wood. Over time, water leaking through deck boards can cause hidden damage unless the wooden joinery of the foundation is properly protected. In fact, builders have reported that wood left exposed to the elements can […]

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