Roof Mold vs. Algae: How Do You Tell Them Apart?

Your roof makes up a significant portion of your home’s exterior. Flaws on its surface can compromise your property’s overall appearance. Mold and algae on roofs can cause more than aesthetic defects. When left unaddressed, these growths can compromise your roof’s integrity.  

While mold and algae appear similar from afar, they are different. Here’s how to tell these growths apart.

What Does Roof Mold Look Like?

Mold is often a sign of a more serious problem. It usually appears as black or dark green patches and can spread quickly across your roof. Leaks and inadequate ventilation are common issues that cause mold growth. 

You shouldn’t take mold growth lightly because it can harm your family’s health. Some types release spores that can trigger allergic reactions and asthma attacks. Eliminating mold can involve professional cleaning and repairs to eliminate moisture sources. 

How Do You Spot Algae Growth?

Unlike mold, algae on your roof is more of a cosmetic issue. It often manifests as black streaks or stains and grows on shaded areas. Moreover, algae typically grow on asphalt shingle roofs. 

Algae spores are airborne and can spread from one home to another. While algae do not damage structures like mold, it can significantly diminish your property’s curb appeal. Addressing algae stains is crucial in maintaining the beauty and preserving the value of your home. 

What Can You Do About These Issues?

Both mold and algae can be treated, and there are steps homeowners can take to prevent their reappearance. Cleaning solutions that include bleach or copper sulfate can eliminate algae but must be used carefully to avoid damage to the roof or surrounding plants. You can also invest in shingles with copper granules that inhibit algae growth. 

Mold treatment, on the other hand, might require more extensive measures. Professional roof cleaning is often the first step, followed by addressing the underlying moisture problems. This could involve improving attic ventilation, fixing leaks or installing vapor barriers.

Are you experiencing issues with your roof? Don’t wait long to address them. Turn to Renovation Team for prompt service and superior craftsmanship. Call us at (636) 939-1061 or complete our online form to get a quote. We serve clients in St. Louis and Chesterfield, MO.