How to Identify Mold, Algae and the Damages they cause on my Roof

Art Unlimited • January 11, 2023

Are you seeing spotted black dust or white spores on the roof, eves, or walls?

 

These could be signs of mold and algae, two of the most common problems that homeowners face. Both mold and algae cause  serious roof damage that can only be addressed by a professional roofing services provider.

 

You may be asking, how do I know if there is a mold or algae problem on my roof? What can I do about algae and mold on my roof? 

 

First, we have to discuss why roofs mold.

 

What causes roof mold or algae on roofs?

 

Mold is a type of fungus while algae is a form of plant life. Both grow on damp surfaces and thrive in dark, warm environments with high humidity levels.

 

Some of the most common causes of roof mold include:

 

  1. Poor ventilation: When your attic or roof is not properly ventilated, moisture can build up and lead to algae and mold growth.

 

  1. Leaks: If water is allowed to seep into your attic or roof, it can create the perfect environment for mold and algae to thrive.

 

  1. Humidity: When the air is too moist, it can cause mold and algae spores to grow and spread.

 

  1. Poor drainage: If water is allowed to pool around your foundation, it can seep into your home and create the perfect environment for mold or algae to grow.

 

 

Mold and algae are signs of improper or lack of roof maintenance. If you see signs of mold on your roof, it’s time to schedule an appointment with a professional who can help solve the problem before it becomes more severe.

 

 

The top signs of mold and algae on your roof

 

  1. A pungent, musty smell. This can be caused by the growth of certain types of bacteria or fungi that feed on organic matter like roof mildew, mold, and algae. If you notice this odor, it’s a good idea to have your roof evaluated by a professional.

 

  1. Discolored areas on your walls, ceilings, shingles or asphalt shingles.

 

Shingle mold and mildew can cause green patches or black spots on the roof. Some molds can also appear as white or grey dust in the early stages before they produce spores and change color.

 

Black spots in light fixtures or above ceiling fans can also indicate roofing and wood fungus.

 

  1. Water stains around gutters or downspouts. The other telltale sign of mold and algae on your roof is wet spots where water has gathered, under the shingles or between them. Water could have leaked out through holes in the seams or in through cracks in the flashing.

 

How to get rid of mold and algae on the roof

 

Dealing with mold and algae on your roof can be a real headache, but it doesn’t have to be.

 

You can help prevent roof leaks and ice dams yourself by cleaning the gutters. Use a hose or vacuum cleaner to get rid of any remaining debris or leaves that may have fallen into your gutters.

 

If you see mold or algae on your roof, contact a professional roofer in your area immediately. Getting on the roof and attempting to clean it yourself can be dangerous. A professional roofer will be able to remove the mold and algae from your roof safely and effectively, which will prevent further damage to your home.

 

As the leading roofing experts in McHenry County and surrounding areas, KM Construction is qualified to identify the source of mold and algae on your roof.

 

Our roofing experts have access to specialized equipment for removing these types of problems. After a thorough evaluation, we will share the professional roof inspection results with you and recommend solutions for any problems we find.

 

Contact us for black mold removal, roofing repairs, or preventive maintenance.

By Norman Roofing October 28, 2025
For industrial buildings in Mississippi, a reliable roof is essential for success. Roofs must withstand the state’s humid climate, heavy rainfall and occasional storms without compromising safety or durability. While a variety of roofing options are available, four materials dominate the industrial roofing market: metal, EPDM, TPO and PVC. So, which roofing material is the best fit for your business? In this guide, we’ll break down the options that perform most effectively in Mississippi, helping you make an informed choice for your facility. Metal Designed to last anywhere between 40 and 70 years, metal roofs are incredibly durable. They’re able to withstand Mississippi’s harsh weather and are fire-resistant. For industrial buildings, this is a great advantage when it comes to safety. Plus, metal roofs are lightweight and require fewer support structures than traditional materials. However, it’s important to note that they typically cost more than other materials since they require specialized skill and labor for installation. Plus, added insulation may be needed to keep energy costs down. EDPM Made from synthetic rubber, EDPM is another ideal option for industrial buildings. The roofing material is resistant to UV rays, harsh weather and a variety of chemicals that are commonly used in industrial work. Typically, this material lasts for about 20 to 30 years and is easy to install. While EPDM offers excellent chemical resistance, it is prone to tearing from foot traffic and debris. Additionally, you may want to consider a lighter-colored EPDM. While lighter colors are more expensive, they absorb less heat than the traditional black color. TPO Similarly, TPO is resistant to both UV rays and chemicals. Its flexibility allows it to withstand the intense heat of Mississippi summers. While this material typically lasts 15 to 30 years, it's easier to install than other roofing materials and can lower energy costs. While TPO can be used on a variety of industrial buildings, it’s not as resistant to grease and chemicals as EPDM. Prolonged exposure may cause this roofing material to degrade over time, potentially leading to leaks. PVC This single-ply membrane is often used in chemical processing plants for its ability to withstand harsh chemicals. PVC roofs are also moisture-resistant, which is beneficial for roofs in the southeast that are exposed to constant humidity. Typically, PVC roofs can last anywhere from 20 to 30 years. While PVC is a viable option, it tends to cost more than other materials. This is largely due to the special skills needed to install the material safely and efficiently. What Material Should MS Industries Use? Often, roofing material is selected based on the specific requirements of the industry. Here are some common industries where material selection plays a critical role: Automotive manufacturing – Requires a material that’s able to withstand chemicals, intense heat and humidity. While EPDM is popular in older facilities, TPO is ideal for newer ones due to its ability to reflect light. Textile mills – For the most chemical resistance, EPDM is often used in textile mills, where frequent exposure to dyes and other chemicals can wear down other roofing materials. Shipbuilding – Since these facilities cover lots of ground, it's not uncommon to see metal roofing in shipbuilding facilities. However, metal roofs must have a protective coating to prevent corrosion from salt air and excessive humidity. Distribution centers – TPO is commonly used for newer facilities since it reflects light and stands up well against harsh weather. EPDM and BUR are commonly found in older facilities. Agricultural buildings – Metal is typically used since it’s exceptionally durable and resistant to pests. Since farms are especially vulnerable to pests, metal roofing is a practical choice for buildings that house feed and livestock. Looking for a Commercial Roofer? Norman Is Here To Help! Whether you’re upgrading your roof or installing one from scratch, Mississippi businesses can rely on a trusted partner. For over 40 years, Norman Roofing has provided the Southeast with expert roofing solutions designed to withstand harsh weather, debris and everyday wear. If you’re looking for honest roofers, call Norman Roofing today at 601-483-4079 to get started on your next project. To explore our other services, including metal panel installation, visit our website by clicking the link here .
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