How to Clean Your Asphalt Shingle Roof: 1 Minute to a Spotless Roof with These Simple Steps

Cleaning your asphalt shingle roof isn’t just about curb appeal—it can prevent the buildup of moss, algae, and lichen, which cause premature damage and shorten your roof’s lifespan. To clean your asphalt shingle roof safely and effectively, follow these steps:

1. Safety First: Use a sturdy ladder, non-slip shoes, and consider fall protection equipment. Never clean a wet or sloped roof alone.
2. Inspect the Roof: Check for damaged, loose, or missing shingles before cleaning—repairing helps avoid leaks during the cleaning process.
3. Remove Loose Debris: Use a soft-bristle broom or leaf blower to carefully sweep leaves, branches, and dirt. Avoid using high-pressure washers, which can damage shingles.
4. Treat Stains & Growths: Mix a 50:50 solution of water and household bleach for algae and moss. Spray gently using a garden sprayer, allow 20–30 minutes, then rinse with low-pressure water.
5. Avoid Harsh Tools & Chemicals: Don’t use wire brushes or ammonia-based cleaners, as these can harm the shingles and nearby plants.
6. Prevent Future Growth: Trim overhanging branches for sunlight and ventilation. Consider installing zinc or copper strips near the roof ridge to prevent algae regrowth.

As a designer, I approach cleaning and maintenance the same way I approach a project: Always combine function with aesthetics. When roof work is on the agenda, it’s also the ideal time to review your home’s overall appearance and explore how even small tweaks—like updated 3D renderings of your home—can bring your vision to life and inspire future design moves.

Tips 1:

Apply cleaning solutions on a cloudy day or early morning to prevent rapid drying, which can cause streaking.

FAQ

Q: How often should I clean my asphalt shingle roof?

A: For most homes, every 2–3 years is sufficient, but clean sooner if you notice moss or algae starting to grow.

Q: Will cleaning my roof void its warranty?

A: It depends—always check your shingle manufacturer’s recommendations before cleaning.

Q: Can I use a pressure washer on asphalt shingles?

A: No. High-pressure water can strip off granules and damage shingles. Always use low-pressure rinsing.

Q: What is the best solution for removing algae from asphalt shingles?

A: A 50:50 mix of water and liquid household bleach, gently sprayed and rinsed, is highly effective.

Q: How can I prevent moss and algae from coming back?

A: Keep trees trimmed back, regularly clear debris, and consider installing metal strips on your roof ridge to help inhibit regrowth.