Best Treatment for a Cedar Roof

November 15, 2017 by Katie Jones Tags : ,

Cedar shingles or shakes offer good insulation, and they give your home a warm, rustic look. They’ve been used for hundreds of years, and they’re resistant to termites. Many cedar roofs last for more than half a century. However, moss, mold, mildew, algae, and fungi can grow on an untreated cedar roof, making your shakes softer and less durable. Several treatments are available, and the experts at Willamette Power Roofing and Roof Cleaning can help you choose the best option for your roof.


When you remove debris like leaves from your roof and your gutters in fall, you may see stains or discolorations from mold or mildew. You can remove most of these with a mixture of bleach and laundry detergent. To prevent them, clean your cedar roof at least once per month. Just make sure you avoid pressure washers since they could damage the materials.

Chemical Treatments

You should treat your roof every one to three years to prevent the sun from fading it or causing cracks and keep unwanted organisms away. Pigments and ultraviolet absorbers can help you repair existing damage and prevent future problems.

You can also spray granular chlorine or calcium hypochlorite. Use a brush on smaller spots to remove moss and make your roof lighter. Other chemicals are available as well. You can buy most of these at a pool supply store. You should wear eye protection, gloves, and an apron while using these products. Rinse it away from your roof after half an hour, and don’t let any excess chemicals fall onto plants because they may be harmful to your lawn.

Oil Treatments

Oil treatments replace the natural oils in cedar roofs as they get older, preventing cracking, cupping, or warping. They also contain chemicals to keep them from becoming an extra food source for mold, fungi, and mildew. These treatments can also make your roof more flammable.

Willamette Power Roofing and Roof Cleaning has more than 25 years of experience, and we can help you treat your cedar roof.