Pressure Cleaning Roof Safety
When operating your power washing equipment wear eye protection, gloves and proper clothing at all times. Test the pressure on a small section and get used to the feel of the force of the jet in your hands. Do not use bleach as it will damage your power washer and the back spray would be landing on your own skin. Use an environmentally safe cleaner instead.
Power washing your roof will extend its life, and prevent any health hazards from the accumulation of fungus or mildew. Additionally, a moss and fungus covered roof will absorb more heat and therefore increase your utility bills. The recommended frequency to clean your roof depends on the location of your home. In the northern states roofs can go longer between cleanings but wherever they are exposed to high temperatures and humidity year round, they need to be cleaned at least every three to four years.
Improper Use of Chemicals Safety
There are several options of cleaners that professionals use to clean your roof, but many include bleach. The disadvantage is that bleach will discolor your walls and siding wherever it streaks down, and will also kill any plant or animal life along the way.
If you are looking to pressure wash the roof yourself, consider using an environmentally safe product such as Biocleanse. This is not only important to protect your house and plants, but also for your personal safety because the inevitable back spray from washing will end up on you as well.
A good quality power washing chemical will reduce total cleaning time. Rinse with plenty of fresh water after you are done.