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Plugged Drains - can lead to serious water build up on roof, water migrating where it shouldn't, creating a dangerous dead load on the roof. |
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Caulking and sealant - are sometimes the only defense against moisture penetration. If dried or cracked they provide a direct point for water entry into the building. |
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Physical Damage - although much damage is caused by storms, more damage results from unauthorized persons on the roof. |
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Spillage - of contaminants exhausted onto the roof, especially animal fats, can attack the membrane, causing severe deterioration. |
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Membrane splits - caused by membrane expansion and contraction and exposed, dried and oxidized felts that eventually split and allow moisture ingress. |
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Blistering - caused by moisture trapped between the plies of the membrane are susceptible to rupture and moisture entry. |
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Missing flashing - exposes the asphalt stripping membrane beneath the flashing to rapid oxidation and deterioration. |
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Membrane ridging - caused by membrane expansion and contraction will lead to the formation of ridges in the membrane which in turn may split. |
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Seams - single ply membranes have heat welded or vulcanized seams which can open and become a direct source of ingress. |
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Lead vent stacks - require caps to complete the seal which are often missing. They are also subject to corrosion perforations over time. |
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Traffic decks - physical damage such as punctures may result from decks set directly on membranes. |
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Debris \ vegetation - signs of a poorly maintained roof, likely to result in damage to membrane. |
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Flashing corrosion - source of water ingress |
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