Why shouldn't I pressure clean my roof?

You can pressure clean your roof. However, you must take into consideration the amount of force applied to a roof while using pressure. 3500 pounds per square inch is what is generally used by a Home Depot pressure cleaner and most professionals. The force of that pressure times the volume of water chips, cracks and breaks tiles, loosens mortar and eventually causes leaks in a roof. Roofs were made to keep the even falling rain from entering your home. You are basically leak testing! Even a professional pressure cleaner must carry a heavy surface cleaner along with his lance and high pressure hose walking each row of you tiles. Between equipment, water, pressure and body weight, there are going to be problems in the future. Asphalt shingle roofs should never be cleaned with a pressure cleaner. Asphalt granules and material are blown off the surface never to be recovered, decreasing the life of your roof. Homeowners insurance policies do not cover pressure cleaned roofs anymore. All insurance companies recommend cleaning according to the suggested manufacturer's recommendation. Chemical Cleaning!

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