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Push piers foundation systems
- To: seaint(--nospam--at)seaint.org
- Subject: Push piers foundation systems
- From: Jim Wilson <wilsonengineers(--nospam--at)yahoo.com>
- Date: Thu, 30 Apr 2009 05:52:48 -0700 (PDT)
Is anyone familiar with the Push Pier System provided by Foundation Supportworks, or similar products for that matter? I have settlement under a portion of my garage that needs to be addressed. This is a simple end-bearing pipe pier hydrolically pushed down to bearing.
The system does carry a 25-year warranty and looks to be well designed. I don't know if there are any particular risks or gotchas with installing these systems. They say they usually hit bearing in 20-30 feet but I realize that is a big unknown. There isn't much online to read about these that isn't promotional. I did find one link to a discussion where they warned about the thickness and grade of the steel.
The contractor does not suggest that I hire a geotech to do a study - am I adding a lot of risk by not doing so? It is only a light single-story structure.
They do not suggest the helical pier, either. Soils are sandy gravel. They are not expansive. The upper layer under the foundation may have been fill but I don't know for sure. Settlement is arguably active - notable additional recent movement has been attributed to vibration from paving our driveway last year. Garage is 20 years old and has dropped maybe 2" overall.
Jim Wilson, PE