| Deteriorated Flashing |
| Broken/Split Seams |
| Metal Edge Breaks |
| Poor Workmanship |
Deteriorated Flashing- The flashing that is installed on walls and curbs usually fails before the roof system does. That is because most of the expansion and contraction takes place here causing the flashing to tear of break. Often the top of the flashing is not terminated properly and this too breaks loose allowing water to enter. It can also cause damage to masonry walls and to the interior of the building.
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Broken/Split Seams- Membrane roofs that are heat-welded or glued together can sometimes split apart with expansion and contraction. Often it is due to a weak seam caused by poor workmanship or, if it is an older roof, it will just lose its elasticity and the weaker areas will break loose.
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Metal Edge Breaks- Often the field sheet of the roofing system is sealed to a metal edging that is installed along the outside perimeter of the building. Expansion and contraction can cause the membrane to break loose from the metal edge. This allows moisture to seep under the roof system and down the wall of the building causing structural damage to the wall if it is not corrected.
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Poor Workmanship- Sometimes roofs leak just because the roofing system was installed improperly. This is especially true of flat roofs because water will accumulate on the roof during heavy rains causing defective areas to leak because of the enormous water pressure on the roof from the standing water.
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