The effects of heat, wind, ice and water, as well as the sun’s ultraviolet rays, cause shingles to deteriorate. This deterioration is even more pronounced on roofs that are in direct sunlight, in areas where ice and snow pile up and on sides where the wind is dominant. By having a proper slope and a well-ventilated roof, your roof can last 20 or 30 years, depending on the quality of the shingles.
If you live in an area where discolouration is caused by algae and is a major problem, choose shingles made using a protective system that prevents the risk of discolouration. In addition, it is recommended that you choose a dark colour shingle, on which the spots caused by algae will show up less.
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