Engineer’s Review Article
The following is an article by Dr. David Grissom P. E., written during his many years serving as board member and two term past president of the Foundation Performance Association. From time to time, Dr. Grissom has revised this article to accommodate the ever increasing price of piers and pilings, but the main text remains the same as it did when first published in 2001.
Dr. Grissom is an independent consulting engineer. His report is based upon his many years of conducting engineering inspections and related personal studies. He continues to provide independent inspections and engineering review as a trusted source for many foundation repair companies in the Houston area.
This article is re-printed here with permission of the author.
If you would like to download and read the complete review, click here.
To Those Seeking Information About Foundation Repair Methods:
The following pages contain an objective comparison of the two most widely used foundation repair methods available in the Houston area. These two methods are the Bell Bottom Pier method (also known as the Drilled and Poured Pier), and the Hydraulically Driven Piling method (also known as a Friction Piling, Pressed Piling, or Segmented Piling), the latter using pre-cast, high strength, reinforced concrete cylinders, 6 inches in diameter
and 12 inches long.
Other methods, such as helical piers, square block pilings, foundation watering and lawn drain systems, root barriers, and others, are not within the scope of this comparison. These are specialty techniques which only have very limited usage parameters, and are not part of the main line of foundation repair techniques, and are not typically FHA, VA, or Conventional Loan approved repair methods.
This comparison is based upon this Professional Engineer’s years of experience,
encompassing thousands of foundation repair projects, in all of the more than 30 types of soils in the Houston area and surrounding counties. It is the intention of this comparison to clearly and concisely state the relevant facts, in a purely objective manner, leaving it to the reader to draw their own conclusions based upon the facts. My hope is that the reader will gain a better understanding of these two foundation repair methods, thereby having enough information to make the right choice for their own situation.