Roofs are made of various materials and when cleaning them the instructions and cleaning solution will be different for each one.
Regardless of where the home is located, asphalt shingles are a common roof material. The shingles are known for their sand-like and granular finish. It is the type of finish that is designed to wear out slowly.
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Due to the layered, delicate nature of the shingles, it is important that when cleaning them that you do it gently so you do not destroy the layer of protection.
Cleaning them too roughly will also decrease the lifespan of your roof. If you are using a pressure washer, you should use a low-pressure washing of no higher than thirty psi, which is equal to a garden hose sprayer. You should not use a mixture of water trisodium phosphate (TSP), and bleach, even though it is found on the internet.
There are several dangers associated with this solution. The bleach will only kill the surface layer of algae and mold, which will regrow, it will poison any vegetation that is under the roof when it runs off, and it can corrode the metal fastenings.
This type of roof is very popular in the subtropical and Southwest regions and in Spanish-style houses. This roofing material can stand higher-pressure washing. It does it without suffering from wear or corrosion.
One important thing to note is that when using a pressure washer you do need to control closely the psi because if you apply high pressure to the wrong place on the roof it could crack the ceramic tile.
If this happens, it could require replacing ceramic tiles on your roof. To help prevent this, it is recommended that you use a soft wash. Ceramic tile roof cleaning should be done using a specialized formula that is designed to attack algae, mold, and fungi growth along with lifting stains.