Leaks seems to come from out of the blue, for no good reason at all. Even on newly installed roofs or relatively young ones, leaks can happen. There are several reasons and factors that should be considered:
Compromised shingles – due to poor workmanship during installation, faulty materials or from storm damage.
Compromised Valleys – the roof valley (The “V” created where two sloping roofs meet) could have been punctured.
Punctured roof or obstructed water flow – falling limbs or trees, hail or other objects can cause major damage to a roof.
Improper Room Ventilation – in rooms where high moisture is generated (i.e. bathrooms) can cause moisture to build up and cause serious damage over time. Be sure these rooms are ventilated properly to avoid problems.
The roof is just too old – Once the materials in your roof age beyond their life expectancy they begin to break down, compromising the integrity of your roof.