When a commercial roof has reached its life expectancy and repairs or restoration are no longer an option it is time to tear off and replaces re roof the existing roof.
Delamination of roof shingles.
Flaking is commonly due to the drying and degrading of the asphalt over the years and the differential movement between the bond coating and the saturated coating caused by the repeated shrinkage and swelling from moisture variations and or expansion and contraction from thermal variations.
Your roof may already be showing signs of failure breaking cracking delamination discoloration and softening.
Flaking organic shingles flaking is the delamination of the upper layer of the asphalt which bonds the granules to the lower layer of asphalt that saturated the organic shingle mat.
When the membrane and insulation separate.
Leading resistance to delamination.
One of the common causes is shingle slip page resulting from the improper placement of the roofing fasteners.
Like blisters delamination can come from improper installation in inclement weather.
Worn or weathered asphalt roof shingles which are losing their mineral granules in the course of normal aging if inspected early in the wear cycle already show small areas of granule loss beginning with bald areas on the shingles which may be just the diameter of a few mineral granules.
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It prevents moisture from entering into the interior spaces if the shingles are lifted displaced or torn.
These bedroom doors open onto a flat roof.
At high points they may be the part of the shingles showing the most wear.
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Shingle slippage on 12 12 pitch roof.
Functional roof covering defects that result in active leaks or an anticipated reduction in the life of the roof shingles compared with the shingle warranty period or shingle life anticipated by the manufacturer.
If the environment is humid moisture can get trapped between the membrane and insulation.
Delaminations commonly affect single ply and fully adhered roofs.
In summary as you are inspecting asphalt shingle roofing systems for reported wind damage keep in mind there are other possible causes of displaced shingles on the roof.
Granule loss in a natural path of travel on the roof is usually caused by scuffing from foot traffic.
Moisture absorption in the deck could lead to delamination or warping of the deck surface providing an unsuitable long term substrate.
