Roof Cleaning

Some highly reflective roofs aren't so reflective after a few years. To maintain the energy savings of a white roof, you have to make sure it stays white. A good cleaning may be in order here.

The ceramic granules on damp, shaded asphalt shingles are a welcoming environment for moss and lichen. These growths can damage the shingles and significantly shorten the life of the roof.

More Pictures:

1. Cleaning a TPO Roof Membrane

2. Lichen Growing on Asphalt Shingles

Useful Links:

1. GeneralSimple roof cleaning guidelines for low-slope single-ply roof membranes are provided by the Chemical Fabrics and Film Association - Vinyl Roofing Division.

2. GeneralZinc and its use in preventing moss and lichen from growing on roofs: information provided by Oregon State University's College of Science.

3. Copper Roofs: "Removing Black Stains from Exterior Copper". Available on the website of the US General Services Administration

4. Shingles - Asphalt: "Algae & Moss Prevention and Cleaning for Asphalt Roofing Systems" provides basic information. Available at the ARMA website.

5. Shingles - Asphalt: "Algae Discoloration on Roofs" provides basic standard information. This short technical bulletin is available on the Canadian Asphalt Shingle Manufacturers' Association website.

6. Shingles - Wood: "Care and Maintenance of Wood Shingle and Shake Roofs" explains things pretty well. Available on Oregon State University's Pacific Northwest Plant Disease Management Handbook site.