Judging the Lifespan of a Roof
The life expectancy of your roof depends factors that include the roof design and the climate you live in, as well as the quality of installation and long-term care and maintenance. However, you can usually determine the average lifespan of your roof based on the material used to cover it.
The life expectancy of a roof varies between different roofing materials:
- 1 - Asphalt Shingles, 3-tab - 15 to 18 years
- 2 - Asphalt Shingles, Architectural - 24 to 30 years
- 3 - Galvalume (metal) - 30 to 45 years
- 4 - Concrete Tile - 35 to 50 years
- 5 - Built-Up or Modified Bitumen - 10 to 16 years
- 6 - EPDM (rubber) - 10 to 16 years
The average lifespan of a roof is based on "average" conditions. Many factors contribute to a longer or shorter life of the roof.
Here's a list of conditions that affect roof longevity:
- - Colour of the roof - A dark roof absorbs more heat, which shortens the lifespan.
- - Angle of the roof slope - Higher pitch roofs tend to last longer.
- - Orientation of the roof surface - A roof slope facing south will get more sunlight, and have a shorter life.
- - Multiple-layer roof - A roof installed over an existing roof will have a shorter life.
- - Installation - Sloppy or improper installation shortens roof life.
- - Attic ventilation - An unventilated or poorly ventilated attic reduces roof lifespan.
- - Trees near the 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.
It is also important to remember that the amount of routine maintenance and the quality of the roofing products you purchase play crucial roles in determining the life expectancy of a roof.
Longevity in a large part is related to the cost and style of roofing materials.
Before choosing a type of new roof, consider how much you want to pay, what kinds of roofing products are used in the neighborhood surrounding your home, and how long you expect to be in your home. You also might want to consult with a roofing contractor about which materials are the best fit for your geographical region in order to determine how long the roof will last.