Moss & Algae Removal

Written by joy v. smith
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Moss & Algae Removal
Moss can be beautiful, but it's not good for your roof. (moss image by michael langley from Fotolia.com)

Moss is a simple green plant that grows in mats or clumps, while algae is an organism with no root, stem or leaf. Moss and algae are commonly found on roofs and walkways in cool, damp climates.

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Moss and Algae

Constant moisture causes moss and algae to grow on roofs, sidewalks, trees and shrubs. Though green and black algae may look like mould on a roof, it's not. Moss has roots and can cause more damage than algae on a roof.

Moss & Algae Removal
Moss in the lawn is usually a symptom of too much water and shade. (hose on lawn image by Coralie Palmeri from Fotolia.com)

Algae Removal

Algae can be removed with a 50/50 spray of bleach and water. Or, use oxygen bleach, a powder you mix with water, which is less toxic and doesn't discolour the way chlorine bleach could. Green algae is easier to remove than black algae. Do not pressure wash shingles, and be sure to protect foundation plantings. Do not use table salt; it's corrosive and ineffective.

Moss & Algae Removal
Algae and moss love water. (Algaes in lake background image by Maxim Petrichuk from Fotolia.com)

Moss removal

Moss on roofs can be swept off, brushed off or scraped off to remove the moss' shallow root system. Work downward to avoid damaging shingles. Remove as much moss as possible before treating it to cut down the amount of chemicals needed.

Moss & Algae Removal
Moss can grow on window sills. (mossy old window image by hazel proudlove from Fotolia.com)

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