In a significant Connecticut Appellate Court victory for policyholders, Murtha Cullina LLP helped Vanderbilt Minerals, LLC prevail in its coverage case against more than 20 of its insurance carriers, who had issued policies from the 1950s to the 1980s. The case presented several complex coverage issues and, at 250 pages, is believed to be the longest opinion ever issued by the Connecticut Appellate Court. In this case, Vanderbilt sought coverage for claims that alleged asbestos-related disease from exposure to industrial talc sold by Vanderbilt. The central issues on appeal concerned how to allocate the cost of the defense and indemnity for these asbestos claims among the parties and whether to apply policy exclusions.


In a 250 page opinion addressing more than a dozen appellate issues, the Appellate Court devoted nearly half of its decision to allocation issues, in which it affirmatively adopted “continuous trigger” and the “unavailability rule” in applying pro-rata allocation to coverage obligations for asbestos claims.

  • Under “continuous trigger,” all policies from the date of first exposure to asbestos to the time of manifestation of the disease may be called upon to respond to the claim.
  • Under pro rata allocation, the cost of defense and indemnity is spread over the triggered policy periods and the policyholder shares in those costs if there are periods when the policyholder was intentionally uninsured or when coverage has been lost or compromised.
  • Under the “unavailability rule,” no allocation is made to periods of time when coverage was not available for the type of risk at issue – here asbestos injuries, which were broadly excluded by the insurance market after 1985.

The Appellate Court provided a very thorough and thoughtful analysis as to why continuous trigger and the unavailability rule are proper components of the pro-rata allocation framework. The Appellate Court explained that the indivisible and cumulative nature of progressive injuries caused by asbestos is fundamentally different from traditional accidents. Recognizing that comprehensive general liability policies do not clearly address how long-tail claims should be allocated, Connecticut and other courts have adopted pro rata, continuous trigger allocation, which the Appellate Court described as “an artificial judicial construct designed to allocate costs between various insurance policies….” The many policy reasons for adopting pro rata, time on the risk allocation, continuous trigger and an unavailability rule were identified by the Appellate Court as including: distributing of the burdens equitably among all parties involved, maximizing resources available to respond to the multitude of claims (which means maximizing the use of available insurance because insurers have a better ability to manage this sort of risk), and satisfying the reasonable expectations of the insured.

The insurers’ argument that policy language providing for coverage of injuries “during the policy period” conflicted with the application of the unavailability rule was rejected by the Appellate Court. Noting that each insurer agreed to write an occurrence-based policy that affords “almost unlimited prospective coverage” for future costs arising from injuries that take place during the policy period, the Appellate Court dismissed any claimed conflict with the policy language or unfairness in applying the unavailability rule.