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Advantage of Grip-Tite Piers over Pin Piles
Robbins and Company has been constructing and stabilizing foundations and various foundation support problems for over 50 years. During that time, several different methods of construction and stabilizing systems have been used.
The most extensively used system of stabilization has been the use of pin piling. These are two inch pins consisting of 2” pipe typically found in plumbing systems. These pipes are pushed into the ground with a pneumatic jack hammer to a point they no longer will move. Even though we have installed this system for the past 30 years or so, we have never been satisfied with this system and have found several flaws with the system.
So we've made the switch to Grip-Tite piers. And it's been like seeing the sun shine after a long rainy day. What we noticed was that we seemed to have discrepancies with the depth of piers. Some of the variables were:
 Problems with installationIn order for a pin pile to be structurally sound, it must be straight with no deformation. We have found it almost impossible to get the pin under the centerline of the wall without bending it or deforming the pipe as shown in Fig 2.
Standard Pin Pile
Over the past few years, we learned that other methods of stabilizing were being used in other parts of the country and with the internet getting more popular, we were able to research systems more effectively. After testing the product for a year in the field, we settled on the Griptite system. This system has superior performance over other methods and is approved by the International Building Code Council. The Griptite system overcomes the short comings of the conventional pin pile system.
With the Griptite Push Pier, there is no deformation of the pin and the footing is held solid on top of the push pier bracket.
Griptite Push Pier 
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Foundation Repair Washington, Foundation Repair WA, Snohomish County, King County, Pierce County, 206 |