15.2 Commercial Umbrella and Excess Liability

What an Umbrella Actually Does

A commercial umbrella is the catastrophe layer of a liability program. It performs three distinct functions, and the exam tests the difference among them.

Quick Answer: An umbrella provides higher limits, drops down when underlying aggregates are exhausted, and fills coverage gaps subject to a self-insured retention.

Required Underlying Limits

An umbrella will not attach unless the insured maintains scheduled underlying limits. Typical requirements:

If the insured lets an underlying policy lapse or carries less than the schedule, the umbrella treats the difference as uninsured — the insured 'self-insures' down to the required attachment point.

Excess (Following-Form) vs. True Umbrella

A following-form excess policy simply 'follows the form' of the primary — same exclusions, same definitions — at a higher limit. A true umbrella has its own insuring agreement and may pick up exposures (e.g., certain personal-injury offenses) the primary CGL excludes.

Maintenance of Underlying and the 'Gap'

The umbrella's maintenance-of-underlying condition requires the insured to keep all scheduled primary policies in force at the required limits for the entire umbrella term. If the insured cancels the CGL or lets the auto liability lapse, the umbrella does not simply absorb the loss — it pays only the amount it would have paid had the underlying still existed, leaving the insured to fund the missing primary layer.

The 'gap' or DIC (difference-in-conditions) function is what makes a true umbrella valuable. Where the underlying CGL excludes, say, certain personal and advertising injury offenses or worldwide exposures, the umbrella may extend coverage to them. Because no primary policy is paying for those gap losses, the insured satisfies the SIR first. This is also why an umbrella is broader than a mere excess policy — it brings its own insuring agreement rather than borrowing the underlying's.

The Self-Insured Retention (SIR)

When the umbrella covers a loss the underlying does NOT (a true gap), there is no underlying policy to pay first. The insured fills that void with a Self-Insured Retention — typically $10,000 to $25,000 — functioning like a deductible the insured pays before the umbrella responds.

• Underlying covers the loss: the underlying pays its full limit first, then the umbrella pays excess. No SIR applies.
• Underlying excludes the loss (gap): the insured pays the SIR, then the umbrella pays above it.

Worked Stacking Example

A contractor carries: CGL $1M occurrence / $2M aggregate, plus a $5M umbrella with a $10,000 SIR.

Scenario A — covered claim, $4M judgment:

• CGL pays its $1,000,000 occurrence limit.
• Umbrella pays the remaining $3,000,000 (within its $5M limit).
• SIR does not apply because the underlying responded.

Scenario B — claim the CGL excludes, $600,000 judgment:

• Underlying pays $0 (excluded).
• Insured pays the $10,000 SIR.
• Umbrella pays $590,000.

Scenario C — drop-down: the contractor has already had $2,000,000 of unrelated covered losses, exhausting the CGL aggregate. A new $500,000 claim arises. The umbrella drops down and pays the $500,000 (less any SIR if the underlying is gone), acting as primary.

Common Exam Traps

• SIR applies only to gap losses the underlying does not cover, not to ordinary excess claims.
• Excess/following-form does NOT broaden coverage — only an umbrella fills gaps.
• Drop-down is triggered by exhaustion of the underlying aggregate, not by a single large loss.
• An umbrella will not attach if required underlying limits are not maintained — the insured eats the shortfall.

Drop-Down Coverage and the Three Ways an Umbrella Responds

A true commercial umbrella can respond in three ways the exam isolates. First, it pays excess over the underlying CGL, auto, and employers-liability limits once those are exhausted. Second, it provides broader coverage than the underlying for some claims — covering a loss the umbrella insures but the underlying excludes; here the insured pays the umbrella's self-insured retention (SIR) before the umbrella responds, because there is no underlying coverage to exhaust. Third, it drops down to pay in place of the underlying when an aggregate underlying limit has been exhausted by other claims.

The umbrella requires the insured to maintain the scheduled underlying limits; if the insured lets underlying coverage lapse or carries less than required, the umbrella treats the underlying as if it were still in force and the insured self-insures the gap. So an insured who reduces a $1,000,000 underlying CGL to $500,000 absorbs the missing $500,000 layer itself before the umbrella pays. Recognizing the SIR-versus-underlying mechanics and the maintenance requirement is the core of umbrella questions.