This specific job in San Rafael, California was bid by 3 different foundation contractors to underpin and re-level the structure. With 85% of the house being within a 1/4-inch of level and about 15% of the home experiencing some heaving due to poor drainage. Two other contractors bidding on the job suggested to underpin and lift the entire foundation to the highest point of the house. We one the bid based on our engineers recomendation to unerpin the heaved area of the foundation, undermine that area and then lower the effected part of the foundation.
With the installation of 6 resistance piers we succesfully underpinned and lowered the heaved area and saved the home owner approximately $22,000. in the process.