Color of roof- A dark roof absorbs more heat, which shortens the lifespan.
Angle of roof slope- Higher pitch roofs tend to last longer.
Quality of roof material- “Economy” roof materials have a shorter life.
Installation- Improper insulation, or lack of, shortens roof lifespan.
Multiple-layer roof – A roof installed over an existing roof will have a shorter life.
Attic ventilation – An unventilated or poorly ventilated attic reduces roof lifespan.
Trees near roof – Tree branches rubbing on a roof or the acidity from the accumulation of leaf debris on a roof shortens its life.
Harsh climate – Severe weather, both harsh winters and hot summers, along with big temperature swings within a 24-hour period, also shorten lifespan because of the expansion and contraction of roof materials.