Does moss or mildew grow on a tile roof?
The natural alkalinity of cement based products will not prevent moss or mildew from growing on roof tile. The mildew or algae does not grow directly on the tile, rather it grows on the accumulation of dust and other organic materials that settle on the tile. When enough heat, moisture and light are present, the mildew and algae spores start to grow. There are also many environmental variables such as the location of the house, the direction the house facing away from the sun and the quantity of shading trees or the proximity of canals and lakes which contribute to mildew growth.
The natural alkalinity of cement based products will not prevent moss or mildew from growing on roof tiles. The mildew or algae does not grow directly on the tile, rather it grows on the accumulation of dust and other organic materials that settle on the tile. When enough heat, moisture and light are present, the mildew and algae spores start to grow. There are also many environmental variables such as the location of the house, the direction the house in relation to the sun, the frequency and strength of wind, the quantity of shade provided by trees or the proximity of rivers, canals and lakes which provide the moisture that help mildew growth. To reduce moss and mildew chose a smooth tile finish that will reduce accumulation of dust and organic materials on the roof.
