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RE: FOUNDATIONS: Warranty for Drilled Pier/Shaft Foundation Installation

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The only thing that is effective is inspection. The remedy is replacement or augmentation to provide the strength of the original drilled pier with the contractor paying all design and construction costs. Inspection, acceptance and payment is covered by the Deep Foundations Institute (DFI). TM-NDT-1 is a good document on NDT inspections. Larry Olson is very experienced in NDT of deep foundations. There are several methods of NDT. Some need to be planned to have embedded instrumentation.

It does you little good to require long term warranties. It is not very practical to try to effect a repair on a structure 1 or 2 years old.

Harold Sprague

From: Bill Polhemus <bill(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: FOUNDATIONS: Warranty for Drilled Pier/Shaft Foundation Installation
Date: Thu, 24 May 2007 11:14:55 -0500

Has anyone here ever been involved with specifying the construction of drilled piers (a.k.a. "drilled shafts," "bored piles," etc.)?

If so, what if anything did you specify for a warranty period against defective installation? What other installation warranty requirements did you specify?

Thanks, all.

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