How to clean your metal roof and prevent buildup

By Jesse Sanchez. 

DECRA gives advice for maintaining stone-coated metal roofing, without sacrificing integrity. 

Maintaining a stone-coated metal roof doesn’t have to be a headache. DECRA Metal Roofing, the original manufacturer of stone-coated metal roofing, has outlined best practices for keeping these roofs free from mold, algae and lichen, helping homeowners extend the life of their investment without causing unintended damage. 

While these roofs are marketed for their durability and ease of maintenance, they’re not immune to environmental wear, especially in shaded areas or near trees. “Stone-coated metal roofing is an excellent solution for anyone looking for an easy-to-clean surface,” DECRA notes. But proper upkeep is critical to ensure long-lasting performance.  

The first and most important rule? Stay safe. DECRA emphasizes fall protection and encourages the use of scaffolding, proper ladders and personal safety equipment. Homeowners should also disconnect any rainwater harvesting systems before startedthe cleaning process and let the roof naturally rinse through several rainfalls before reconnecting. 

In terms of cleaning techniques, less is more.  Avoid using pressure over 500 PSI or water hotter than 160°F. DECRA recommends a gentle rinse with a garden hose and a roof-safe cleaner. 

Not all cleaning products are equal. DECRA explicitly warns against copper and iron-based solutions, which can accelerate corrosion or leave rust stains. Instead, they recommend safer options, likeWet & Forget Outdoor and Bayer Advanced 2-in-1 Moss & Algae Killer.  

Routine maintenance also goes a long way. Trimming nearby branches, clearing debris and cleaning out gutters can significantly reduce organic buildup and water pooling, which often accelerates mold and algae growth. 

Stone-coated metal roofing is a smart, long-term choice not just for its durability but for its relatively simple upkeep. With the right tools and techniques, homeowners can maintain a pristine roof without having to use harsh chemicals. 

For those curious about how to preserve or restore the appearance of their roof, the original DECRA article offers a comprehensive breakdown from safety measures to product recommendations!