How to Properly Clean Your Roof

1. Pressure Wash the Roof - Pressure washing is the most common technique for cleaning the roof, as it is effective and can combine with detergent to improve cleaning efficacy. It is important to note that you must be careful not to damage joints, penetrations and side and end laps when cleaning with a pressure washer.
2. Clean the Roof with a Heavy Bristle Broom - If you don't have a pressure washer accessible, you can use a heavy bristle broom and water hose to clean the roof.
3. Clean All Remains Off the Roof - After the roof is sufficiently cleaned, it must be thoroughly rinsed and all debris flushed down the drains or into the sewers.

How to Test the Roof for Adequate Coating Bond:

1. Apply 2" masking tape to an area of the roof that had previously been dirty, such as a ponded water section or a drain sump. Press the tape firmly into the roofing substrate.
2. Peel the tape back:
• If it is difficult to peel off and there is no dirt or degraded roofing material on the backside of the tape, proceed with coating.
• If it peels easily with dirt or degraded roofing material embedded on the bottom of the tape, you should clean again and retest.