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Black Streaks on Roofs in Lakeway: Safe Removal Guide

Have you noticed dark streaks running down your roof in Lakeway? These stains are most often caused by a type of algae called Gloeocapsa magma. Left untreated, algae can shorten roof life, increase energy costs, and hurt curb appeal. The good news: there’s a safe, proven way to clean it.

What Causes Roof Algae in Lakeway?

Lakeway’s humid climate, shaded lots, and oak pollen create perfect conditions for algae. North-facing slopes and areas under trees often show streaks first. Algae feeds on limestone filler in asphalt shingles and spreads quickly if ignored.

The Safe, Manufacturer-Approved Method

Roofing manufacturers and the Asphalt Roofing Manufacturers Association (ARMA) recommend soft washing for algae removal. This method uses:

  • Low-pressure water (not high PSI that strips shingles)
  • Specialized cleaning solutions that kill algae at its root
  • Thorough rinsing of gutters and downspouts

High-pressure washing can void your roof warranty—avoid it at all costs.

Protecting Landscaping During Cleaning

We take extra care with Lakeway homes surrounded by oak trees and landscaping:

  • Pre-wetting plants and grass before treatment
  • Covering sensitive shrubs or garden beds
  • Rinsing downspouts and directing runoff safely away

When Should You Treat Roof Algae?

It’s best to treat streaks as soon as they appear. Waiting allows algae to spread and set deeper into shingles. Many Lakeway homeowners schedule treatment every 3–5 years, depending on shade, roof pitch, and tree cover.

FAQs

Will high pressure void my roof warranty?

Yes. Most shingle manufacturers specifically warn against pressure washing. Soft washing is the approved method that maintains warranty coverage.

How long until algae comes back after treatment?

Most roofs stay clean 3–5 years depending on shade, tree cover, and moisture. Preventative cleanings every few years help protect roof life.

Is zinc or copper striping worth it?

Yes, in some cases. Zinc or copper strips near the ridge line release ions that inhibit algae growth. We can discuss if this makes sense for your roof.

Next Steps

Don’t let algae shorten your roof’s life or reduce curb appeal. Our Lakeway team uses manufacturer-approved methods to restore shingles safely.

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