Esicorp, Inc. (“Esicorp”), sued St. Louis Testing Laboratories, Inc. (“SLT”), for losses arising out of the need to repair defective pipe welds that SLT’s testing had failed to discover. Liberty Mutual Insurance Company (“Liberty Mutual”) refused to defend SLT under the comprehensive general liability (“CGL”) policies Liberty Mutual issued to SLT for the period in question. SLT settled with Esicorp for $2,125,000, paying $125,000 and satisfying the remainder of its settlement obligation by assigning its rights against Liberty Mutual to Esicorp. Esicorp then sued Liberty Mutual to recover SLT’s agreed liability.
In
Esicorp, Inc. v. Liberty Mutual Insurance Co.,
Esicorp’s predecessor, acting as prime contractor, purchased large diameter, welded steel pipe sections from a St. Louis fabricator for a construction project at a California hydroelectric plant. SLT inspected and approved the welded pipe sections at the fabricator’s shop before they were shipped to the project site in California. On site, the pipe sections were field-welded together to form an integrated pipe system. When the project was well under way, spot checks revealed defects in the fabricator’s shop welds. The project owner suspended work and required Esicorp to discover and repair defective welds. Esicorp repaired more than four hundred defective shop welds at the job site, a process that required invasion of pipe sections already integrated into the new pipe system. Esicorp’s damage experts opined that Esicorp incurred losses of more than $3,000,000 as a result of SLT’s failure to discover the defective welds in the fabricator’s shop in St. Louis. The losses included substantial repair costs, increased costs of contract performance, and liquidated damages to the project owner because of project delays.
The relevant insuring agreement in Liberty Mutual’s CGL policies provided, “We will pay those sums that [SLT] becomes legally obligated to pay as damages because of ‘bodily injury’ or ‘property damage’ to which this insurance applies.” The sole issue presented on appeal is the extent to which the SLT settlement reimbursed Esicorp for losses that were covered “damages because of ... ‘property damage.’ ” 1 The policies defined “property damage” as follows:
“Property damage” means:
*862 a. Physical injury to tangible property, including all resulting loss of use of that property; or
b. Loss of use of tangible property that is not physically injured.
The interpretation of an insurance policy is an issue of law we review
de novo. Esi-corp I,
The key policy terms are “damages because of ... ‘property damage’ ” in the insuring agreement and “physical injury to tangible property” in the definition of property damage. It is significant that the defectively welded pipe sections did not collapse or burst or otherwise cause accidental injury to surrounding property as a result of SLT’s negligent inspection.
Compare Scottsdale Ins. Co. v. Ratliff,
Before 1973, “property damage” in the standard CGL policy was defined as “injury to or destruction of tangible property.” Applying that definition, a number of courts held that diminution in the value of a building resulting from the incorporation of a defective component was covered property damage.
See Western Cas. & Sur. Co. v. Polar Panel Co.,
However, in 1973, the definition of “property damage” in the standard CGL policy was changed to
“physical
injury to or destruction of tangible property,” the language used in the policies here at issue. The Supreme Court of Minnesota and other courts construing this new definition have concluded that the mere incorporation of a defective component is not “property damage” because it does not result in “physical injury.”
See Federated Mut. Ins. Co. v. Concrete Units, Inc.,
Although the Supreme. Court of Missouri has not addressed this issue, the Missouri Court of Appeals commented that the integration of defective materials into a home, without more, was not covered property damage in
Hawkeye-Security Insur
*863
ance Co. v. Davis,
Alternatively, Esicorp argues that there was extensive physical injury to tangible property in this case caused by the work in repairing the defective shop welds in the field — gouging out and repairing the weld defects, invading and then restoring a high quality epoxy coating on the inside of the pipe sections, severing a neoprene seal, and removing or altering steel rebars and concrete forms already in place. Liberty Mutual concedes that the repair operations caused some “property damage” within the meaning of the policy — the damage to the epoxy coating, neoprene seal, rebars, and concrete forms incurred because the defective welds had to be repaired at the job site after they had been incorporated into the pipe system, rather than at the fabricator’s shop where SLT inspected them. However, Liberty Mutual argues that the majority of Esicorp’s losses did not fall within the insuring agreement because the repairs to the shop welds were not covered injuries.
Liberty Mutual cites some support for this contention. As the Ninth Circuit said in construing the term “physical injury” in
New Hampshire Insurance Co. v. Vieira,
In its motion for summary judgment and on appeal, Esicorp took the position that it may recover the entire settlement amount if there was
any
covered property damage. The district court agreed, concluding that all costs incurred in repairing the defective welds, and all consequential damages resulting from the need to repair, may be recovered because there was $11,298 of covered damage to the epoxy coating. As we strongly suggested in
Esicorp I,
It is apparent from Esicorp’s damage evidence that the vast bulk of the $3,046,709 loss allegedly attributable to SLT’s negligent inspection were the costs of repairing the defective welds in the field and the consequential damages caused by the need to undertake those repairs. Esicorp made no attempt to apportion either its total loss or the settlement amount between these direct and consequential repair costs, which were not covered property damage, and the direct and consequential costs resulting from the limited damages Liberty Mutual concedes were covered. Esicorp, in suing as assignee of SLT, had the insured’s burden to prove that its losses fell within the policy’s insuring agreement.
Estrin Constr. Co. v. Aetna Cas. & Sur. Co.,
Notes
. Thus, we do not address other often-litigated issues, such as whether any covered property damage was caused by an "occurrence,” and whether it fell under the so-called "business-risk exclusions” in the Liberty Mutual policy.
See, e.g., American States Ins. Co. v. Mathis,
. In
Missouri Terrazzo Co. v. Iowa National Mutual Insurance Co. .,
