Shingles that are buckling This sign may be caused by a felt that may be applied improperly of it may also be caused by your roof deck moving around. When you notice this, calling in a roofing expert as soon as possible ensures that you are able to solve and sort out the problem before it gets out of hand.
The growth of mold and algae
This growth is normally brought about by climates that are humid and warm since they provide a very good breeding ground for these organisms. It is also caused when algae and airborne fungi deposits or grows in your roof.