This roof is very old and can cause many safety issues when going up on your roof as well as significant water damage to the inside of the home if roof leaks start to appear in many areas - REPLACE NOW!
ALGAE / MOSS
Moss can grow on roof surfaces that don’t get much sunlight especially in cool, moist climates. Moss growth can be more than a cosmetic issue. Moss holds moisture against the roof surface and overtime in freezing climates can cause damage to the granules on the top of the shingles. Moss can be brushed off but it won’t prevent it from growing again; take care not to damage the shingle surface. You may need to contact a professional roofing contractor - REPLACE NOW!
Your roof is at least 20 years old; while many shingles today are produced for durability, many factors can accelerate the aging of shingles. For example, if your roof is not properly ventilated, it can negatively impact your shingles - REPLACE NOW!
Dark streaks. Airborne algae cause dark streaks on roof decks. While this may not necessarily harm the roof shingles, it may not look good. Algae streaks can be removed using a 50:50 blend of water and bleach sprayed on your roof. It is important to use a low volume garden hose so you do not knock the protective granules off your shingles. It is also important that you protect your landscaping from the bleach run-off - REPLACE NOW!
CURLED SHINGLE EDGES
Shingle edges are curled or shingle tabs are cupped, this is a sign that your roof is super dry and is about to crack all over causing a significant water damage to the homes interior when rain begins, DO NOT go up on this roof, it is dangerous - REPLACE NOW!
MISSING GRANULES / BALD SPOTS
Missing Granules or Blad Spots on your roof represents an unsafe roof, pretty soon your roof will crack and start leaking all over the place - REPLACE NOW!