Roof Stains: What Does It Mean And What Can You Do

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Would You Be a Roofer? Some people work as roofers for a summer or two. Others become lifelong devotees to the profession. Those who commit to roofing as a long-time profession really take the time to learn the details. Not only do they learn how to put roofs in place, but they also learn quite a lot about various roofing materials. This equips them to make good recommendations to homeowners who are looking for the right roof. We will also make some recommendations and tell you a bit more about roofers on this blog. While we are not roofers ourselves, we know a lot about the profession and are always happy to share.





When a roof is stained, it typically means that there are discolorations or marks on the surface of the roof that can be caused by several factors, including algae, moss, lichen, or other types of organic growth. These stains can be unsightly and can also damage the roof over time if left untreated.

Environmental Causes of Roof Staining

Roof staining can occur due to a variety of environmental conditions.

  1. High humidity levels can lead to the growth of mold and mildew on the roof, which can cause unsightly stains.
  2. Roofs with a low slope or pitch tend to collect more moisture and debris, which can lead to staining over time.
  3. Areas of the roof that are shaded by trees or other structures are more likely to experience staining, as they are more likely to retain moisture.
  4. Environmental pollution, such as air pollution or acid rain, can also contribute to roof staining over time.
  5. Roofs in coastal areas or areas with high levels of precipitation are more likely to experience staining due to increased moisture levels.
  6. Overhanging branches or nearby vegetation can cause debris to build up on the roof, leading to staining.

What to do About Roof Staining

The remedy for stained roofs depends on the cause of the staining. If the staining is caused by algae or moss growth, the most common solution is to clean the roof with a mixture of water and a cleaning agent, such as bleach or oxygenated bleach. This can be done by a professional roofing contractor. It is important to note that cleaning a roof can be dangerous and should only be attempted by someone with experience and proper safety equipment. In addition, some types of roofs, such as those made of slate or tile, may require special cleaning techniques to avoid damage.

In some cases, it may also be necessary to take preventative measures to avoid future staining, such as installing zinc or copper strips along the roof ridge line to inhibit the growth of algae and moss. Speak to a roofing contractor for help with those installations. 

In the end, the best remedy for a stained roof will depend on the specific cause of the staining, as well as the type of roofing material and other factors. It is generally recommended that you consult with a professional roofing contractor to assess the situation and recommend the appropriate course of action.

Contact a company like KRG Roofing to learn more.  

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