Mold on roof shingles is more than just an unsightly nuisance — it’s a potential threat to the integrity of a home’s roof and the health of its occupants. Unfortunately, homeowners often overlook this sneaky invader until it’s spread significantly, making removal more challenging. This guide will walk through the process of identifying, removing, and preventing mold growth on roof shingles, ensuring a cleaner, safer, and longer-lasting roof.
The Dangers of Mold on Your Roofing Shingles
Mold on roof shingles isn’t just a cosmetic issue. If left unchecked, it can lead to serious problems. Mold thrives in moist environments. Unfortunately, mold can quickly spread across a roof’s surface, starting as small spots that transform into unsightly streaks.
Health Risks
When mold spores become airborne, they enter the home, potentially causing respiratory issues for occupants. Individuals with allergies or asthma may be particularly susceptible to health problems from mold exposure.
Structural Damage
As mold grows, it can deteriorate roofing materials. This deterioration can lead to leaks, which may further damage the roof’s structure and the home’s interior. According to the United States Environmental Protection Agency, mold can grow and spread within the home in as little as 24 hours after forming on a damp surface, emphasizing the need for quick action.
Decreased Home Value
A moldy roof can significantly impact a home’s curb appeal and, consequently, its market value. Potential buyers may see a moldy roof as a sign of neglect and walk away from making an offer.
Identifying Mold on Your Roof
Before tackling mold removal, it’s crucial to confirm that what’s on the roof is mold and not something else. Here’s how to identify mold on roof shingles:
Visual Inspection
Look for dark streaks or spots on the roof, especially in shaded areas or where moisture accumulates. Mold often appears as black, green, or brown discoloration.
Texture Check
Mold feels slimy or fuzzy to the touch. However, to protect your health, it’s important to wear protective gear before coming into contact with potential mold.
Mildew can be mistaken for mold, so double-check that it’s mold, not mildew, before proceeding as mildew is benign.
Professional Assessment
When in doubt, consult a roofing professional or mold specialist so they can identify the type of growth and recommend the best course of action.
Steps to Clean Mold Off Roofing Shingles
Once you’ve identified mold, take action. Here’s a step-by-step guide on how to remove mold from roof shingles:
- Safety should be the top priority before starting any work on the roof. Wear rubber gloves, eye protection, a breathing mask or respirator, and cover any exposed skin. Use a sturdy, secure ladder, and consider a safety harness for steep or high roofs.
- Cover surrounding vegetation with tarps or plastic sheets to protect them from cleaning solution runoff. This step is crucial for maintaining the health of plants and soil around the home.
- While commercial roof cleaners are available, a homemade solution can be just as effective. Mix one quart of bleach with one gallon of water and 1/4 cup of trisodium phosphate. This mixture is potent enough to kill mold and remove stains. Phosphate can also help remove staining if needed.Â
- Using a pump sprayer, apply the cleaning solution to the affected areas. Start at the bottom of the roof and work upwards to avoid streaking. Let the solution sit for around 20 minutes, but don’t let it dry completely.
- For stubborn areas, use a soft-bristled brush to scrub the shingles gently. Don’t use excessive force, which could damage the shingles.
- After the solution has had time to work, rinse the roof thoroughly with clean water from a garden hose. Start at the top and work downwards to ensure all the cleaning solution is removed.
- Once the roof has dried, inspect it for any remaining mold. If some areas still show signs of mold, repeat the process, focusing on those spots.
Prevention Tips to Avoid Roof Mold
Preventing mold growth is easier and more cost-effective than removing it. Here are some strategies to keep mold at bay:
- Ensure proper attic ventilation to reduce moisture buildup. Good airflow helps keep the roof dry and less hospitable to mold growth.
- Keep trees trimmed back from the roof. This allows more sunlight to reach the shingles and reduces moisture-trapping debris.
- Clean gutters at least twice a year to ensure proper drainage. Clogged gutters can create water backup and increase roof moisture.Â
- Consider installing zinc or copper strips along the roof’s peak. When it rains, these metals release molecules that inhibit mold and algae growth.
- Have a professional inspect the roof annually. A professional can spot potential issues before they become serious problems.
Why Mold Grows on Roof Shingles
Understanding why mold grows can provide better insight into prevention and maintenance practices. Various factors contribute to mold growth on roof shingles, and knowing these can help homeowners take more effective steps in keeping their roofs mold-free.
Moisture Accumulation
Moisture is one of the primary culprits behind mold growth. Roofs exposed to frequent rain, high humidity, or leaks are more susceptible to mold. Ensuring proper drainage and promptly fixing roof leaks are essential steps.
Shaded Areas
Roof sections that receive little sunlight tend to stay damp longer after rain, providing an ideal environment for mold to thrive. Removing or trimming trees and other obstructions allows more sunlight to reach the roof, reducing these shaded areas.
Poor Maintenance
Neglecting roof maintenance can lead to an accumulation of organic matter, such as leaves and twigs. These materials trap moisture and serve as food for mold. Regular cleaning of the roof and gutters helps prevent this buildup.
Inadequate Roofing Materials
Some roofing materials are more prone to mold growth than others. For example, wood shingles are particularly susceptible, whereas metal or asphalt shingles with anti-algae coatings provide better resistance.
When to Call a Professional
While many homeowners can handle small mold problems, there are times when it’s best to call in the experts:
Extensive Mold Growth
Professional remediation may be necessary if mold covers a large portion of the roof or has penetrated beneath the shingles.
Recurring Mold Issues
If mold keeps coming back despite DIY efforts, there may be underlying issues that a professional can identify and address.
Safety Concerns
Professional services ensure safe and thorough mold removal for homes with steep roofs or for homeowners uncomfortable working at heights.
Specialized Equipment Needs
Professionals have access to commercial-grade cleaners and equipment that may be more effective for severe mold infestations.
Prevention Services
Many professional companies offer preventive treatment services. These services apply specialized coatings or treatments to shingles to prevent mold growth. This proactive approach can be more cost-effective over time, avoiding the need for repeated cleanings.
Cost Considerations
The cost of mold removal can vary widely based on factors such as the extent of the mold growth, the roof’s size, and accessibility. According to Angi, professional mold removal services cost an average of $1,223 to $3,749.
Preventive measures add to the total expense but may save money in the long run by reducing the need for future mold removal.
So, Is Mold Removal Worth It?
Dealing with mold on roof shingles is an essential aspect of home maintenance that shouldn’t be overlooked. By taking prompt action to remove mold and implementing preventive measures, homeowners can protect their roofs, maintain their home’s value, and ensure a healthier living environment.
Remember, while DIY methods can be effective for minor mold issues, there’s no shame in calling professionals for more severe cases. The key is to address the problem quickly and thoroughly, whether that means grabbing a scrub brush or picking up the phone to call an expert.
Frequently Asked Questions
Can I use natural cleaners instead of bleach for mold?
Yes, hydrogen peroxide, vinegar, baking soda, ammonia, or tea tree oil make effective natural antimicrobial cleaners that can get rid of mold. However, bleach remains the strongest mold removal agent in most cases.
Why does mold keep recurring soon after I clean the roof?
Rapid mold recurrence likely signals an unaddressed moisture issue like flashing leaks, defective shingles, clogged gutters, or insufficient attic ventilation. Consult a roofing contractor or mold specialist for a consultation and inspection.
Is household mold exposure seriously hazardous?
The degree of risk to a person’s health caused by mold exposure is a question for medical professionals. However, as a general rule, mold can and does affect people’s respiratory health, so you should fix mold infestations as soon as possible.
