A membrane is a layer used to separate, protect or control movement through part of a building assembly. Its function depends on the product and installation.
What this means at your property
A roofing membrane, waterproofing layer and vapor-control layer are not interchangeable. Joints, penetrations and transitions can be as important as the field of the material when investigating a leak.
What should a membrane repair specify?
Ask for the product or system, damaged locations, preparation and treatment of seams and adjoining details. Clarify whether the proposal addresses the water-entry source or only replaces a visibly damaged section.