Coinsurance, Concealed Rot, and a Demand for Appraisal
Riverside Mercantile owns a 40-year-old brick store insured on an ISO commercial property form containing an 80% coinsurance clause. The building's replacement cost is $1,000,000; the owner carries only a $600,000 limit to hold the premium down, with a $5,000 deductible and replacement cost settlement on the building. In June the supply line to an ice machine ruptured. The adjuster found $40,000 of water damage to stock and shelving and, inside the wall cavity, rot and mold that had developed over several years, which she priced at $60,000 to remediate. The owner filed a proof of loss for $100,000. When the insurer offered less, the owner demanded appraisal, insisting the only dispute was the amount of loss.
1. Compute what the insurer owes. Show each step of the analysis, including the effect of the coinsurance clause and the deductible.
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Step 1 - Isolate the covered loss. The bursting supply line is a covered water-damage peril: $40,000. The rot and mold inside the wall are the product of long-term, repeated seepage and deterioration, excluded by the continuous-or-repeated-seepage (14 days or more) exclusion, the wear-and-tear/deterioration exclusion, and the mold exclusion. The limited mold remediation sublimit applies only to mold resulting from a covered peril, which this is not. Covered loss = $40,000.
Step 2 - Apply coinsurance. Required limit = 80% × $1,000,000 = $800,000. Carried = $600,000.
- Did/Should = 600,000 ÷ 800,000 = 0.75
- The insured is a coinsurer for the other 25% of every loss - that is the price of the reduced limit, not a penalty to negotiate away.
Step 3 - Compute payment. 0.75 × $40,000 = $30,000, less the $5,000 deductible = $25,000.
Notes: replacement cost settlement does not erase the coinsurance penalty; the ratio is struck on the loss before the deductible. Had the owner carried $800,000, the same loss would have paid $35,000. The $100,000 proof of loss is not evidence of value - it includes excluded damage.
2. The owner demands appraisal. Should the insurer go to appraisal, and what should it do to protect itself?
Read the worked answer
Appraisal decides the amount of loss, not whether there is coverage. The fight here is chiefly a coverage question - whether $60,000 of rot and mold is covered at all. Most courts hold an appraisal panel cannot resolve coverage, and an award that rests on excluded damage would be subject to being set aside. Submitting the whole dispute to appraisal invites an unenforceable award and delays payment.
Recommended handling:
- Issue a written, itemized coverage position that cites the seepage/deterioration/mold exclusions and shows the coinsurance math.
- Pay the undisputed $25,000 immediately. Withholding money that is clearly owed to gain leverage creates bad-faith and statutory-interest exposure far beyond the $60,000 in dispute.
- Reserve all rights in writing and invite appraisal limited to valuation of the covered water damage if the parties genuinely disagree on the repair cost - offer to split the appraiser/umpire cost as the condition provides.
- Keep the proof of loss in perspective: an inflated claim is a claim-preparation problem unless it is a material, knowing misrepresentation; do not leap to a fraud denial on these facts.