Deterioration due to age

The tile roof underlayment (90#) cracks with age

Often, leaves and other debris are found under the tile if the roof is not kept clean.

This aids the deterioration process because moisture is constantly laying on the roofing surface.

When shingles get old and loose their granules,

DSCN0469.jpgAs shown in the image to the left, The membrane holding the shingle together becomes weak and the shingles are susceptible to blow offs.
Storm_damage.jpgIn this picture, a high wind took off a section of the roofing, exposing the plywood and allowing rain to damage the unit. Other shingle roofs in this apartment complex with new roofs were unaffected.