Piers vs. Other Methods
Push Piers WILL:
□ Allow the deepest penetration of any steel pier type.
□ Allow for the possibility of low impact interior installations (typically, with far less collateral damage than the exterior approach)
□ Provide a lifetime warranty, transferable for the first 25 years, that vertical movement in the piered areas will not occur
□ Perform it's job in most soil conditions for a designed life in excess of 100 years
Replace the Foundation:
□ Destroys yard and takes several weeks to complete
□ No warranty against the same problem reoccuring (expect same result)
□ Footings are still in the Active Zone
□ VERY EXPENSIVE�$50,000 PLUS
Concrete Underpinning/Spread Footings:
□ Can take weeks/months
□ Added weight of the concrete can make problem worse
□ Structure cannot be lifted
□ Footings are still in the Active Zone
Concrete Piers:
□ Concrete cylinders can break during installation and CANNOT be retrieved due to depths
□ Cylinders create too much skin friction to get through the Active Zone
□ May require additional shims in the future
□ Even if shimming is included in the warranty, the damage from re-settlement and re-excavation is not covered
Square Shaft Helicals Piers:
□ Originally designed to provide resistance to guy wires on electrical towers during high winds.
□ Not designed to hold up weight through soils
□ Square shafts experience bending and folding when a foundation's weight resting on it.
Concrete Piers with Cable Reinforcement:
□ Engineered for specific soil conditions that are not present in Colorado.
□ Cylinders create too much skin friction to get through the Active Zone
□ Cabling in center of pier stretches over time, allowing for moment after piers in place.
□ Additional cabling on exterior of cylinders can increase skin friction of cylinder.
This information courtesy of Foundation Technology, A Guide to What Go on Beneath Your Feet
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