A contractors limitation endorsement is virtually always attached to umbrella policies issued to contractors and construction-related entities imposing limits or exclusions on the umbrella's coverage with respect to certain exposures arising out of the construction operations.
Some endorsements operate to make the umbrella coverage following form over the coverage provided for these exposures in the underlying policy. However, other versions of the endorsement impose more restrictive conditions or even absolute exclusions. It is desirable to confirm that following form coverage is provided over explosion, collapse, underground property damage, damage to the work, and contractual liability coverage, as provided within the primary layer.