About Master Flow™ Zinc Moss & Mildew Preventer

The Master Flow™ Zinc Moss & Mildew Preventer NMM50 installs easily near the roof ridge to help protect your roof against moss and mildew growth. The zinc strip does not kill moss or mildew but helps inhibit their growth to help reduce the need for roof related to moss and mildew. The zinc strip is installed along both sides of the ridge of the roof, with most of the strip left exposed. The exposed zinc strip will oxidize and leach zinc oxide when it rains to help inhibit the moss and mildew growth.

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