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Lamb-Weston rule

The Lamb-Weston rule prescribes a way of apportioning coverage among multiple applicable policies that imposes pro rata sharing of covered losses, regardless of the policies' "other insurance" provisions.

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Lamb-Weston, Inc. v. Oregon Auto. Ins. Co., 219 Or. 110, 341 P.2d 110 (Or. S. Ct. 1959).