What this risk is, and why it matters
Policy interaction is what happens when several covers, such as primary and excess layers or overlapping liability policies, could all respond to one loss. It matters because their wordings do not always fit together: the insured may pay twice for the same risk, or face a standoff over which insurer responds first while the claim goes unpaid. For a senior executive, the concern is discovering at the point of loss that a layered programme contains conflicts at exactly the seams that should hold.
Legal and regulatory framework
Allocation between insurers is governed by contribution and other-insurance clauses, subrogation rights, and rules on how layered programmes attach and exhaust. Excess covers typically respond only once underlying limits are spent, and competing other-insurance clauses can create circularity that the law resolves through established principles. The report describes how these mechanisms operate in your chosen jurisdiction and industry as background research, not as advice on a specific programme's interaction.
Typical scenarios and impact
Scenarios include excess insurers declining to engage until primary limits are confirmed exhausted, disputes over double insurance, and gaps where layers fail to attach cleanly. Impact ranges from delayed payment and extra legal cost to genuine shortfalls where wordings leave part of a loss uncovered. In complex towers, inter-insurer disputes can hold up substantial sums for months even though no party denies the loss is, in principle, insured.
Mitigation framework and when to engage an expert
Reduce interaction risk by ensuring layered programmes are built on consistent wordings that attach and follow form correctly, with other-insurance positions understood in advance. Brokers should map the full tower and reconcile overlaps and gaps at placement; coverage counsel can resolve wording conflicts and inter-insurer priority questions. When a loss spans multiple policies, coordinate notifications across all of them and manage insurers in parallel so priority disputes do not stall the recovery.