The Frozen Sprinkler Line: Coinsurance Math and Concurrent Causation
Coastal Kitchen Co. operates a restaurant in Westbrook. Its commercial property policy shows: building, replacement cost, limit $720,000, 80% coinsurance, $5,000 deductible; business personal property $200,000 at replacement cost with no separate coinsurance entry. The building's current replacement cost is $1,200,000; the BPP's replacement value is $200,000. In January a loss occurred: the adjuster documented $240,000 of building damage and $60,000 of BPP damage. The insured's maintenance man says a sprinkler line froze and split; a plumber's invoice says the floor drain backed up when the city sewer surcharged and water stood three inches deep before the split was discovered.
1. Compute the building payment and the BPP payment, showing each step.
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Building - the coinsurance test:
- Requirement = 80% × $1,200,000 = $960,000
- Limit carried = $720,000, which is 75% of the requirement → a penalty applies
- Loss payment = (limit carried ÷ requirement) × loss = ($720,000 ÷ $960,000) × $240,000 = 0.75 × $240,000 = $180,000
- Less the $5,000 deductible = $175,000
- The limit ($720,000) is not reached, so the limit does not cap the result.
BPP: The limit ($200,000) equals the replacement value, so the insured is to value and there is no penalty. $60,000 of damage is fully payable, subject to the deductible.
Deductible application - flag this. Standard forms apply one deductible per occurrence, not per building or per item. On that reading the single $5,000 was already absorbed by the building payment, and the BPP pays $60,000. Some forms apply the deductible separately to each covered property, and wind or hail often carries its own deductible - verify the actual loss payment and deductible provisions before issuing the check. Total on the standard reading: $235,000 against $300,000 of damage.
2. How does the dispute over the water's origin change the outcome?
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The two stories lead to different policy provisions, not merely different facts.
- Frozen, split sprinkler pipe: escape of water from a plumbing or fire-protection system within the building is a covered cause of loss. Watch for the freezing exclusion: most forms exclude freezing damage when the building is vacant or unheated, unless the insured maintained heat or shut off and drained the system. A operating restaurant suggests heat was maintained - document the thermostat setting and service records.
- City sewer surcharge backing up through a floor drain: that is water backup, typically excluded and restored only by endorsement, often with a sublimit (frequently $25,000 or less). If backup is the operative cause, a large part of the $300,000 may be uninsured.
If both are true, analyze concurrent causation: if a covered cause (pipe freezing) and an excluded cause (backup) combine to produce a single loss, the outcome turns on the form's anti-concurrent-causation language. A form with ACCL excludes the entire loss where an excluded cause sets the sequence in motion; a form without it may pay the portion attributable to the covered cause. Document the physical evidence - water line marks, drain condition, the split's location - before cleanup destroys it, and notify the carrier of a possible subrogation claim against the city.
3. The insured argues the penalty is unfair because the loss was only a fraction of the building's value. How do you explain the coinsurance clause and what would you offer?
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Explain the bargain, not just the math. The insured bought a $720,000 limit and is paying premium for $720,000 of capacity, but the coinsurance clause is the price of the reduced rate he received. The clause shifts part of every partial loss to the insured in proportion to the shortfall. The penalty is not triggered by the size of the loss - the same 75% factor applies to a $10,000 loss and a $240,000 loss, and it applies even if the building is never a total loss.
Note that the credit works both ways: in a total loss he caps out at $720,000 and the remaining $480,000 of replacement cost is his own money.
Options to present:
- Raise the limit to $960,000 - removes the penalty and costs premium now, but the exposure is real: one total loss at today's value wipes him out.
- Agreed value - suspends the coinsurance clause for the policy term in exchange for a stated value and typically a higher rate; requires a current valuation.
- Keep the limit and self-insure the shortfall - defensible only if he has the balance sheet, and should be documented in a signed coverage-declination letter.
Never present a limit increase as a way to "fix" this claim - it cannot be applied retroactively.