Split in PVC curb flashing detail at non chamfered edge detail. Tenting of PVC membrane at parapet wall detail. Condensation and fungus growth found on the underside of a residential roof application caused by inadequate ventillation. Illustration of an improperly nailed shingle. Typical blister, note width of blister.
Blister is usually a sign of moisture entrapment in the interply felt layer.
Typical longitudinal ridge. This type of ridge is caused by movement of the insulation substrate. This could be caused by delamination of the insulation with the deck or vapour retarder of shrinkage of the insulation. Asphalt bleed out from a BUR roof. This is a sign of aging.