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An upward, elongated tenting displacement of a roof membrane frequently occurring over insulation or deck joints. Ridging may be an indication of movement within the roof assembly
A rupture (generally linear) or tear in a material or membrane resulting from tensile forces.
A small bubble or blister in the flood coating of an aggregate-surfaced built-up roof membrane.
An enclosed pocket of air, which may be mixed with water or solvent vapor, trapped between impermeable layers of felt or membrane, or between the membrane and substrate.
Detachment of a uniform layer of a coating or surface material, usually related to internal movement, lack of adhesion, or passage of moisture.