Shingles are designed so that the Granules block the UV rays of the sun and protect the asphalt underlayment. As the shingles age, the granules fall off over time. Once the asphalt is exposed the shingle begins to dry out and the corner of the shingles begin to curl upward. The shingle will have a cracked and brittle look to it, with many bald black spots where the granules have completely fallen out.
Ageing Asphalt
The Properties of the Asphalt layer have a great effect on granule loss because the asphalt is what bonds the granules to the shingles surface. As the asphalt deteriorates your shingle granules will start falling out at faster rate. Once this happens then little things rapidly wear your roof down ie….Hail, heavy rains, hanging up christmas lights, pressure washing your roof, birds and squirrels etc…
Choosing 30, 40, 50 Year Roof Shingles
Many roof contractors will try to up sale you to the more expensive roof shingles for two reasons.
1) Increases their profit margin.
2) The thicker 50 Year shingles look so much nicer than the 25 or 30 Year roof systems.
The important question here is, “Does the thicker 50 Year shingle lose it’s granules at a slower pace than a 30 Year shingles. It certainly is a heavier shingle with much more matting and asphalt and granules applied. But when the asphalt has reached its peak, no matter how much matting , granules or asphalt has been applied to a shingle, you are sure to start losing granules rapidly, around 25 -30 years. The 50 year warranty roof may never leak for 50 years but the granular loss would greatly affect the apperance of your roof.
If a thicker roof shingle is the look you want, then a 40-50 year roof shingle is the way to go. I guarantee you though, that you will be wanting to replace the worn out looking 50 year warranty roof at 30 years, due to it’s ugly appearance and black balding spots.
The best way to slow the granule loss process is to make sure you keep your attic space as cool as possible. An under-vented attic will speed up granule loss. Also a lighter colored shingle will not absorb the heat from the sunshine like a black or charcoal roof will. A cooler shingle equals longer roof life.
Gerry Ray’s Roofing
253-394-6687
Tacoma, WA


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