Cleaning Stone Coated Metal Roofs

Learn some common methods of cleaning stone coated metal roofing, from basic detergent to more stringent options. Unlike asphalt roofing, stone coated metal roofing does not absorb moisture. That said, dust, dirt, and other airborne accumulation can occur; possible food sources for algae, mildew, or moss.

The Mix

There are several options – the list below includes options that have been tested and proven in a number of environments, and on a number of stone coated finishes:

• Spray & Forget
• Bayer Advanced 2-in-1 Moss & Algae Killer
• Simple Green
• Redishan’s Wash Safe Roof Wash
• Roof Cleaner OX
• Wet & Forget Outdoor

The Wash

Verify with the manufacturer for specific cleaning instructions.

In general, use a soap cannon attached to a standard hose or a pressure washer hose to clean. DO NOT USE WATER PRESSURES ABOVE 500 PSI. DO NOT EXCEED 165 DEGREE WATER TEMPERATURE. Rely on the cleaner to do the heavy lifting and use water spray more for a rinse procedure than a primary lift method.

In all situations avoid forceful removal of stone coat granules.

Use fall protection, wear soft-soled shoes, and limit foot traffic to overlap nose of panels. (See product installation guides for specific foot placement).

The Rinse

After washing, rinse thoroughly with clear water to eliminate the potential of residue.