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Deemers are some insurers who attach endorsements to property insurance policies in which all property damage (PD) is "deemed" to have occurred at a specific moment in time.

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For example, the endorsement may provide that all covered PD is deemed to have occurred at the moment damage first began, regardless of when it was discovered. Under these types of endorsements, informally referred to by some as "deemers," the insured's knowledge of a claim is not relevant to which policy is triggered. As with the "first knowledge" endorsement, a given loss can trigger only one policy (assuming all the affected policies have this type of provision), but the actual policy that is triggered could be different under these two approaches.