CCQ-1991 - Civil Code of Québec

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2625. Where the insured is over-insured by double insurance, each insurer is bound, as between himself and the other insurers, to contribute to the loss rateably to the amount for which he is liable under his contract.
If any insurer pays more than his proportion of the loss, he is entitled to recover the excess from the other insurers in the same manner as a surety who has paid more than his proportion of the debt.
1991, c. 64, a. 2625.