Ridgeline Fabrication: The 80% Clause, a $300,000 Fire, and a Retroactive Fix
Ridgeline Fabrication insures its only building on a commercial property form. Replacement cost of the building is $1,200,000. Ridgeline carries a $720,000 building limit, an 80% coinsurance clause, a $10,000 per-occurrence deductible, and replacement cost valuation. The owner declined a $1,000,000 limit to save premium. In March, a fire causes $300,000 of repair cost on a replacement cost basis. After the fire the owner asks whether he can pay the difference in premium now and have the loss adjusted as though he had bought the higher limit.
1. Compute what the insurer owes and show the coinsurance arithmetic. Then state, in dollars, how much of the loss Ridgeline absorbs itself.
Read the worked answer
Step 1 - the coinsurance requirement
0.80 × $1,200,000 = $960,000 required limit to avoid a penalty.
Step 2 - did Ridgeline meet it?
Carried $720,000 against $960,000 required → underinsured. Ratio = 720,000 ÷ 960,000 = 0.75.
Step 3 - apply the penalty to the loss
0.75 × $300,000 = $225,000
Step 4 - compare to the limit
The coinsurance result ($225,000) is below the $720,000 limit, so the limit does not cap it.
Step 5 - deductible
$225,000 − $10,000 = $215,000 payable.
What Ridgeline absorbs:
- Coinsurance penalty:
$300,000 − $225,000 = $75,000 - Deductible:
$10,000 - Total out of pocket: $85,000
Had he carried the $960,000 requirement, the same loss would have paid $300,000 − $10,000 = $290,000. The extra limit was worth $75,000 on this one fire - a useful way to show him the premium he saved.
2. The owner wants to buy up the limit now and have the claim adjusted as if he had been insured to value. Explain why that fails, and identify what part of the policy actually determines the answer.
Read the worked answer
It fails for three reasons.
- The insurance contract is fixed at the time of loss. Limits, coinsurance percentage, and valuation basis are read as of the fire, not as of the negotiation. Buying limit afterward would let an insured insure only the losses that happen - the definition of adverse selection, and no form allows it.
- Coinsurance is a rate-and-limit bargain, not a fee. Ridgeline paid a premium computed on a $720,000 limit. Retroactive premium cannot create coverage that did not exist on the date of loss.
- Material misrepresentation risk. The application stated a value; an attempt to rewrite it after a loss can taint the whole claim, not just the limit.
What actually controls:
- The coinsurance clause and the declarations page limit, as of the date of loss.
- The replacement cost provision, which promises RC only if the property is actually repaired or replaced; if Ridgeline takes a cash settlement and walks away, the adjuster is entitled to settle on an actual cash value basis instead, and the numbers above get worse.
Constructive answer: the only forward-looking remedy is to raise the limit at the next renewal - which requires a new replacement cost estimate, since the current $1,200,000 figure is itself only a snapshot.
3. Suppose the building had been a total loss. Does the coinsurance penalty reduce the payment below the policy limit? Show the computation and explain the result.
Read the worked answer
Run the formula first, then apply the limit.
(720,000 ÷ 960,000) × $1,200,000 = 0.75 × $1,200,000 = $900,000
$900,000 exceeds the $720,000 limit, so the insurer pays the limit:
$720,000 − $10,000 deductible = $710,000
What this shows
- The coinsurance penalty is a proportional reduction of the loss, capped by the limit. It can never produce a payment larger than the limit, and on a total loss the limit controls before the penalty bites.
- So the underinsurance cost is not linear. A partial loss of $300,000 cost Ridgeline $75,000 in penalty; a total loss costs him $480,000 in uninsured value plus the deductible, because the limit simply stops.
- The practical lesson to give the client: coinsurance penalizes partial losses dollar-for-dollar against the ratio, while the limit caps total losses absolutely. Both failures trace to the same decision - carrying $720,000 on a $1,200,000 building.
- Confirm whether the form allows a margin clause or agreed value; either would change the analysis, and Ridgeline should not assume the plain 80% clause is his only exposure.