LEFT:  Improper drainage from upper roof and lack of ability to dry properly has caused this roof to grow moss.

RIGHT:   Damaged rafters in the attic has caused this roof to become wavy which could possibly cause leakage.

Moisture is the leading cause of damage/deterioration at all areas of the home.  Any moisture penetration problems should be repaired immediately. 

Check your ceilings, plumbing pipes, and walls for moisture stains or leakage regularly.

Insure that all guttering systems are clear of debris and connected properly with downspout extenders to promote roof drainage away from the foundation to prevent water entry into the lowest levels.

Left:  Leakage at plumbing lines in the ceiling areas can cause it to rain inside your home.

Right: Mold growth at this state can be a serious health concern.

"Water is the driving force of all nature." 

-Leonardo da Vinci