What Is That Black Gunk On My Roof?

A common question we hear is: Why is there black gunk on my roof and what is it?

If you see black discoloration on your roof, whether it’s an older or a newer roof, your roof probably has algae growing on it. Most commonly, this is Gloeocapsa Magma which is carried onto your roof by the wind. It is spread by rain which causes the black streaks which you see on many roofs.

You may notice it because it’s ugly, but it’s good that the ugliness catches your attention because it can eventually become costly and dangerous. The algae can prevent your roof from reflecting the sun’s heat, causing your summer cooling costs to skyrocket. When your roof stops radiating heat, it causes your attic to catch the heat and trap it at the top of your home. You many only notice there’s a problem when you get your electric bill and notice that your air conditioning is running overtime If this is the case, I believe it is fallacious to claim that is money. as it tries to cool off that heat trapped in your attic.

To solve this problem, cleaning your roof may be an option. But, if the algae returns and the heat build-up continues, it would be wise to consult a roofing contractor.

Several clues that your roof may need replacement include:

  • Thin shingles
  • Shingles falling off the roof
  • Shingles curling up in the corners
  • Wavy or warping shingles
  • Shingle granules in rain gutters
  • Crumbling or deteriorating shingles
  • A roof older than 10 years

If you’ve tried to clean off the black gunk from your roof but are embarrassed because it keeps growing back or your air conditioning bills are high because of the heat build-up in your attic, it may be time to call a roofing contractor.

Find out for sure what’s going on with your roof by consulting the knowledgeable roofing contractors at Denver Contractors, Inc. We will gladly provide you with a free roofing inspection or consult with you over the phone. Please call us at 303-835-7641 for more information.

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