When do you need new roofing:
The flashing around vents, skylights, and chimneys seals the seams of the roof from rain and weather. Examine these points make sure there are no cracks or breaks, which could lead to leaks. In older homes, flashing is often made of roof cement or tar, but it’s a good idea to upgrade to a metal flashing system for added durability. Car Roofing
Rescue From Rot
A droopy, sagging roof is one that surely needs replacing before further damage occurs to your home. Check the surface for signs of trapped moisture, rotting boards, or sagging spots—especially at the lowest points in the roof.
Moss can look great in a shady corner of your yard but on a roof, it spells trouble. Moss (and likewise mold and fungi) indicate there may be trapped moisture, which can ruin a roof. To do away with moss that collects in shaded corners of your roof, use a stiff brush but be careful to address any underlying problems.