MOORE & TABER                     

 

 

Soil Grouting and Ground Improvement Specialists

 

         

Moore & Taber used mechanical jacking techniques to underpin, raise and re-level the central foundation for this octagonal mountain residence in Pine Mountain Club, California.

A severe water leak exacerbated settlement of subgrade soils for the central foundation element, reported to carry structural loads on the order of 75,000 pounds.  A large stone fireplace is also supported by this footing.  Resulting floor deflections were observed to be on the order of 2.5 inches.

The repair scheme involved excavation of a series of jacking pits beneath the central footing.  This was a delicate procedure, since support for the remainder of the foundation had to be maintained throughout the operation.  Additional jacks were used to support selected sub-floor joists.  Careful lifting of the foundation was able to commence, once the jacks were in place.  Relative floor elevation differential was measured with manometers as the foundation was gently lifted to its improved elevation.

The image below is a comparison of pre- and post-construction relative floor elevation contours.  The mechanical jacking procedure resulted in a final measured relative floor elevation differential of less than +/- 0.2-inches from the central column (fireplace) to the adjacent perimeter walls.

Back to Project Profiles