Evaluating Your Roof Part 2: Understanding Shingle Degranulation

What Is Shingle Degranulation and Why Does It Matter?

Degranulation occurs when the colored granules on your asphalt shingles begin to loosen and fall off. These granules aren’t just cosmetic — they provide waterproofing, UV protection, and algae resistance. Without them, your shingles become vulnerable to leaks, premature aging, and costly damage.

Granules also help prevent algae growth by incorporating a protective coating. When these start wearing away, it’s a clear sign that your roof’s protective layer is failing.

How Granule Loss Can Lead to Roof Leaks

As granules wear away, the asphalt underneath is exposed to the elements. Sunlight, wind, and rain can break down the asphalt quickly, leading to cracks, curling, and water intrusion. Over time, this can cause:

Interior water stains on ceilings or walls
Mold or mildew growth in your attic
Structural damage from prolonged moisture exposure

3 Common Signs of Shingle Granule Loss

Watch for these warning signs during a roof inspection:

Discoloration or Bald Spots – Black patches or uneven color may appear where granules have worn away.
Shiny or Sparkly Areas – A glimmering look means the fiberglass mat is exposed beneath the asphalt.
Granules in Gutters – Excess granules in your gutters indicate that your shingles aren’t holding up under weather conditions.

What to Do if You Notice Granule Loss

If you spot any of these signs, don’t wait — schedule a professional roof inspection. Early detection can help you avoid expensive repairs or a full roof replacement. In some cases, repairs or partial replacements may restore your roof’s integrity before damage spreads.

At NW Cascade Home Services, we specialize in diagnosing roof problems and offering cost-effective, long-lasting solutions.

Helping You Make the Right Roofing Choice

With countless styles, colors, and materials available, selecting a roof can feel overwhelming. That’s where we come in. Our team at North Cascade Home Services works closely with you to evaluate appearance, performance, and sustainability—ensuring your new roof looks great, performs exceptionally, and meets your long-term goals.

Call us today for a free inspection and find out if your roof needs simple maintenance or a more extensive repair.

Get in Touch with Our Roofing Experts Today

From quick repairs to full replacements, North Cascade Home Services is here when you need us. Our friendly, no-pressure team is ready to answer your questions and guide you through the process.

Ready for a free quote or consultation?

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North Cascade Home Services delivers premium roof, gutter, and exterior replacements built for Pacific Northwest homes. Trusted craftsmanship. Local expertise. Lasting results.

Evaluating Your Roof Part 2: Understanding Shingle Degranulation