Clause of the insurance contract according to which the insurer institutes, in the event of a partial loss, a level of tolerance in favour of the insured, which will not be penalized if the actual reconstruction cost of the insured property is greater than that declared at the time of the underwriting (under insurance situation).This clause is expressed in a percentage that may vary from insurance coverage to another, but usually fluctuates between 80% and 90%, depending on the coverage in the insurance policy. In the absence of such a clause, or where the amount of insurance declared is less than the minimum amount corresponding to the percentage mentioned in the stated amount co-insurance clause, the insurer could apply section 2493 Civil Code of Quebec, which imposes a 100% proportionnal rule.