When negotiating new insurance contracts, policyholders should consider obtaining assistance from insurance coverage counsel to seek inclusion of terms that accommodate vertical exhaustion. (Credit: Free use image/ALM archives) When negotiating new insurance contracts, policyholders should consider obtaining assistance from insurance coverage counsel to seek inclusion of terms that accommodate vertical exhaustion. (Credit: Free use image/ALM archives)

California law has become more favorable toward companies facing liabilities based on alleged events spanning multiple years.

In a series of cases spanning over the last 30 years, the California Supreme Court adopted an all sums with stacking approach to coverage for continuous injuries. Under this approach, where an ongoing loss continued through multiple policy periods:

  1. The insured could call on any primary policy during this period;
  2. That policy would be liable for all sums up to its policy limits; and
  3. The insured could have access to or "stack" the limits in all the policy periods.

Left to be decided was whether a first-level excess policy could be accessed before all other underlying collectible insurance was exhausted.

Want to continue reading?
Become a Free PropertyCasualty360 Digital Reader

Your access to unlimited PropertyCasualty360 content isn’t changing.
Once you are an ALM digital member, you’ll receive:

  • Breaking insurance news and analysis, on-site and via our newsletters and custom alerts
  • Weekly Insurance Speak podcast featuring exclusive interviews with industry leaders
  • Educational webcasts, white papers, and ebooks from industry thought leaders
  • Critical converage of the employee benefits and financial advisory markets on our other ALM sites, BenefitsPRO and ThinkAdvisor
NOT FOR REPRINT

© 2025 ALM Global, LLC, All Rights Reserved. Request academic re-use from www.copyright.com. All other uses, submit a request to [email protected]. For more information visit Asset & Logo Licensing.