As spring approaches, Oklahoma City experiences increased rainfall and humid weather—ideal conditions for roof algae and moss to thrive. While they might seem like just a cosmetic issue, these unwanted invaders can actually cause long-term damage to your roof.
Understanding what causes them and how to prevent their growth can help homeowners protect their investments and keep their roofs in great condition.
What Causes Roof Algae and Moss?
Rainfall and High Humidity: Oklahoma’s humid climate and spring rains create the perfect environment for algae and moss to develop. Moisture left on the roof, especially in shaded areas, encourages their growth.
Poor Drainage: Clogged gutters or improper water runoff can lead to standing water, which speeds up algae and moss buildup.
Limited Sunlight: Moss thrives in areas that don’t get much sunlight, such as north-facing roof slopes or spots shaded by overhanging trees.
Organic Debris: Leaves, dirt, and other debris that collect on your roof provide nutrients that help moss and algae grow.
The Risks of Algae and Moss on Your Roof
Shingle Deterioration: Moss holds onto moisture, which can weaken shingles over time and lead to leaks. It’s not uncommon for areas under moss or debris to appear “soggy” and wet due to moisture retention.
Shortened Roof Lifespan: Excess moisture and moss’s root-like structures can lift shingles, causing premature wear and tear.
Reduced Energy Efficiency: Algae-covered roofs absorb more heat, increasing cooling costs during the summer.
Water Damage Risk: Moisture trapped by moss can seep into the roof deck, leading to wood rot and mold growth.
How to Prevent Algae and Moss from Growing on Your Roof
- Keep Gutters Clean – Regularly remove leaves and debris to ensure proper drainage and prevent moisture buildup.
- Trim Overhanging Branches – Reducing shade on the roof allows sunlight to dry out damp areas.
- Use Algae-Resistant Shingles – Many modern roofing materials contain copper or zinc granules that naturally prevent algae and moss growth. We love the CertainTeed Landmark shingles for this reason!
- Improve Roof Ventilation – Proper airflow helps prevent excess moisture from accumulating on the roof’s surface.
- Schedule Regular Roof Inspections – Professional roof inspections can detect early signs of algae or moss before they cause serious damage.
Safe and Effective Removal Methods
If algae or moss has already started growing on your roof, removing it properly is crucial to avoid damaging the shingles. Here are some effective methods:
1. Gentle Cleaning with a Roof Cleaner
- Use a mixture of water and a mild cleaning solution specifically designed for removing roof algae.
- Apply with a sprayer and allow it to soak for 15-20 minutes before gently rinsing.
- Avoid high-pressure washers, as they can strip away protective shingle granules.
2. Install Copper or Zinc Strips
- Placing metal strips near the roof’s peak can help prevent future algae growth. As rainwater washes over these metals, it creates an environment that inhibits moss and algae.
3. Professional Roof Cleaning
- If the growth is extensive, hiring a professional roofing company ensures safe removal using non-damaging techniques. Don’t use a power washer on your roof shingles!
Protect Your Roof with Triple Diamond Construction
At Triple Diamond Construction, we understand the unique challenges that Oklahoma homeowners face when it comes to roof maintenance. Our team provides expert inspections, repairs, and algae-resistant roofing materials to help keep your roof in top condition. If you are seeing dark streaks on your roof or are worried you might have a problem with algae, schedule a professional roof inspection today!
