Pressure washing is never recommended for cleaning your roof. Shingle manufacturers specifically indicate that pressure should never be used to clean your shingles. Pressure washing does not kill algae and, if left untreated, the moss and algae will return quickly to your roof. You also run the risk of causing irreparable damage to the shingles themselves. Pressure washing will loosen granules which can cause shingles to prematurely fail. The water pressure can also lift shingles, breaking the seal between shingles and allowing a path for future leaks.

Valentine Roofing always recommends moss removal by gentle agitation using a roof brush to prevent granule loss and shingle lift, followed by a moss and algae treatment to ensure they stay gone.

The cost of a roof cleaning will vary depending on the type of roofing material as well as the size and pitch of the roof. At Valentine Roofing a one-time roof cleaning starts at $549, while our annual roof cleaning and maintenance starts at $329, a great value.

A roofing contractor familiar with the roofing material and manufacturer recommendations, like Valentine Roofing, is always the best choice when it comes to roof cleaning and moss removal. You can rest assured that a roofing contractor will have the proper equipment, training, and tools to safely and effectively clean your roof.

While it may seem that the rain is washing away any treatment left on your roof to kill moss and algae, it is actually helping the process. The rain will create a mixture with the treatment, covering the shingles as it moves down the roof. This is an effective way to guarantee that all your shingles get an even distribution of treatment for weeks to come.