Asphalt roofs are popular for many homeowners due to their durability, cost-effectiveness, and aesthetic appeal. However, like any roofing material, they can be susceptible to moss and algae growth, especially in damp or shaded areas. Moss and algae not only detract from the appearance of your roof but can also cause damage over time. Let’s delve into the causes of moss and algae growth on asphalt roofs and provide practical tips for preventing and managing these asphalt roof repair.
Understanding Moss and Algae Growth
Causes of Moss Growth
Moss thrives in moist, shaded environments. It can often be found on roofs that are frequently shaded by trees or other structures, where moisture can accumulate and linger. Moss can grow in the crevices between shingles, gradually lifting them and allowing water to seep underneath, potentially causing leaks and damage to the roof structure.
Causes of Algae Growth
Algae, particularly the blue-green variety known as Gloeocapsa magma, often appears as dark streaks on asphalt roofs. Wind-borne algae spores can settle on roofs, especially in humid climates. Algae growth does not directly harm the roof, but it can degrade the appearance of the shingles and retain moisture, which may contribute to other issues.
Preventing Moss and Algae Growth
- Keep Your Roof Clean
Regularly cleaning your roof can help prevent the buildup of organic materials like leaves and twigs, which can trap moisture and provide a breeding ground for moss and algae. Use a leaf blower or a soft brush to remove debris from your roof. - Trim Overhanging Branches
Trimming back tree branches that hang over your roof can reduce the amount of shade and allow more sunlight to reach the surface. This can help keep the roof drier and less hospitable to moss and algae growth. It also reduces the amount of organic debris that falls onto the roof. - Install Zinc or Copper Strips
Metal strips made of zinc or copper can be installed along the ridges of your roof. When it rains, small amounts of metal are released onto the roof surface, inhibiting the growth of moss and algae. These strips are effective and can last for many years. - Ensure Proper Drainage
Proper roof drainage is essential for preventing moss and algae growth. Ensure that your gutters and downspouts are clean and functioning correctly to direct water away from your roof. Standing water can contribute to the growth of moss and algae. - Use Algae-Resistant Shingles
When replacing or installing a new roof, consider using algae-resistant shingles. These shingles are coated with copper granules that help prevent algae growth. Many asphalt shingle manufacturers offer algae-resistant options that can help keep your roof looking clean and new. - Apply a Roof Treatment
There are various commercial roof treatments available that can help prevent moss and algae growth. These treatments are usually applied with a sprayer and can provide protection for several years. Make sure to choose a safe treatment for your specific type of roofing material.
Asphalt roof repair with Existing Moss and Algae
1. Manual Removal
For small areas of moss or algae, you can use a soft brush to gently scrub the affected areas. Be careful not to damage the shingles. Avoid using a pressure washer, as the high pressure can strip away the protective granules on asphalt shingles and cause further damage.
2. Chemical Treatments
Chemical treatments specifically designed for removing moss and algae from roofs are available. These treatments are usually sprayed onto the affected areas and left to sit for a period of time before being rinsed off.
3. Professional Cleaning
It may be best to hire a professional roof cleaning service for extensive moss or algae growth. Professionals have the expertise and equipment to safely and effectively clean your roof without causing damage.
Preventing moss and algae growth on your asphalt roof is necessary for maintaining its appearance and longevity. You can protect your roof from these common problems by keeping it clean, trimming overhanging branches, installing metal strips, ensuring proper drainage, using algae-resistant shingles, and applying roof treatments. If you already have moss or algae on your roof, consider manual removal, chemical treatments, or professional cleaning to restore it to its best condition.
At Shepherd Roofing and Renovations, we specialize in asphalt roof repair. Our team of experts can help you keep your roof in top condition and address any moss or algae growth issues.
