Composition shingles are made of modified asphalt, fiberglass matte and colored ceramic granules. How long a composition shingle roof will last is usually determined by the weight of the shingle which translates to the thickness of the shingle. Asphalt shingles are durable and add a class A fire rating to your roof which can save you money on your homeowners insurance. There are many different designs and colors to choose from when considering asphalt shingles, ranging from a cedar shake to a slate look. The asphalt shingle is one of the most reliable roofs to install on your home. The life expectancy varies with the weight of the shingle and can last anywhere from 20 to over more than 50 years.