The formation of mold, mildew and algae on concrete roof tiles in Florida is a normal occurrence and is primarily due to environmental conditions such as humidity, temperature and an abundance of airborne plant spores. These growths appear in the form of brown, black or green spots on the roof. These do not affect the performance of the roof tile, nor the roof system, but are strictly cosmetic.
Periodic cleaning may be required to remove the mold and mildew. Consult a local roof pressure cleaning service that has experience in roof cleaning and spraying. A low pressure water spray with a large volume of water will usually remove the mold and mildew. Care should be taken not to use a high pressure spray that can “blast” the tile, as this may remove the top coat of some tile. Steam cleaning and other expensive treatments are seldom necessary to get rid of mold and mildew.
Rooftop traffic can be detrimental to any roofing material. While Forterra Roof Tiles are extremely strong and well able to withstand the traffic of professional roofers, it is better that others stay off. Television and other antennas, air conditioners, solar heaters and Christmas decorations should be positioned so that installation and removal can be made without going on the roof. If it is necessary to remove from your roof such objects as tree limbs, leaves or children’s toys, try using a long stick or rake, or other such tool.