Roofs
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Understanding Asphalt Shingle Aging
The Curing Phase
Asphalt shingles, like all materials, age over time. In the first few years, during what is known as the Curing Phase, you may notice small surface cracks or blisters. These early signs are normal and do not impact the shingles’ ability to protect your roof.
The Stable Phase
Following the initial aging, the shingles enter a Stable Phase, where signs of wear slow down significantly. This phase can last 20 to 30 years, influenced by factors such as roof construction, ventilation, pitch, location, materials, design, underlayment, and the quality of installation.
The Final Phase
As the shingles near the end of their lifespan, the aging process accelerates. This is the Final Phase, when many homeowners start considering roof replacement. During this time, you may observe the following:
Signs It’s Time to Replace Your Roof
Curling
You may notice slight curling along the bottom edge of the shingles, especially in cold weather. This occurs as the asphalt loses its oils, becoming more rigid and shrinking faster than the felt underneath.
Surface Cracking
Over time, exposure to the sun and environmental factors can cause small surface cracks, much like how skin reacts to heat. This cracking is a normal part of the aging process as shingles become more brittle.
Blisters
Large blisters, sometimes as big as a quarter, may appear on the surface of aging shingles. These can be open or closed and are often caused by inadequate ventilation or tree sap. Small blisters typically do not affect shingle performance.
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