Don't just rely on the quality of asphalt shingles if you want to have a long-lasting roof. Even the manner of the roof's construction will affect the longevity of your roof. Here is a brief look at how aspects of construction affect asphalt shingle longevity:
Slope of the Roof
Asphalt shingles are best installed on roofs with slopes of at least 2:12. This means a vertical change of two units for every horizontal change of 12 units. Therefore, your asphalt shingles will not last long if the slope of your roof is less than 2:12. Water runoffs are slower on flatter roofs, which increases the risk of ice damming and accelerates damage (of shingles) due to weathering. This is also connected to the increased risk of roof leak from the ice damming or wind-driven rain.
Problem areas of the roofs are those that involve complex shapes, roof projections (such as chimneys), valleys, and ridges. All these shapes interfere with the under-roof ventilation and proper drainage of the roof, both of which reduce the longevity of the roof. Therefore, the more problem areas you have on your roof, the more its longevity is reduced.
Asphalt shingles need to be nailed down properly if they are to stay on the roof even when acted upon by the forces of wind and rain. Improper nailing can also lead to shingles breakage. The nails have to be driven in the proper pattern, the recommended numbers of nails have to be used, and they have to be at the correct depth. This is why shingle nailing is best left to a professional roofer who understands such things.
Proper roofing underlayment (the material installed on the roof deck before the shingles) is also necessary for a durable asphalt shingle roof. The underlayment presents an extra weather barrier in case water penetrates the roofing and also increases the evenness of the roof so that the shingles aren't distorted. It shouldn't be installed on a wet or icy roof deck; otherwise, it will not protect the roof as well as it should. Improper underlayment installation leads to the premature demise of your asphalt roof, even for high-quality shingles.
Therefore, before you start blaming the weather or quality of your shingles for your roof's poor longevity, make sure your roof installation is suitable for asphalt shingles. The only way to do this is to hire an experienced and qualified roofing contractor to handle your roofing project right from the beginning.
For roofing contractors in your area, contact a company such as Ziparo Brothers Construction.