Taves Roofing cleans the following roof types: Asphalt/Fiberglass Shingles, Clay and Concrete Tile Roofs, Flat and Roll Roofing. We do not pressure wash any of these roofs at anytime for the reasons outlined below:
Asphalt / Fiberglass – Water getting under and extra granule loss are two of the reasons why its a bad idea to pressure wash Asphalt. This is a quote from the Asphalt Roofing Manufacturers Association. “Caution ! High pressure washing systems for algae removal should not be used.”
Clay and Concrete Tile – Pressure washing tile is actually allowed by some of the tile roof manufacturers. However, they say to a maximum PSI of 1200 and staying at least 1 foot away from the surface. I doubt that any technician washing your roof adheres to these guidelines. Another thing to consider is your neighbours home. If your houses are at all close together, they need to be warned of the monumental mess of wet moss and sandy muck that will be hitting their siding, windows and gardens. Also, in my opinion its impossible to pressure wash a tile roof and not get at least some water under the tiles. Another thing to remember is when you pressure wash a tile roof, you’re not actually killing the spores so the moss and algae will grow back quicker than if you kill the root of the problem with chemical.