Mold & Mildew Stained Composites
Mold & Mildew or other fungus growth, such as green lichen or moss, and the stains that result are considered an “Act Of Nature” because fungus can only occur in environments where spores exist, they land on a surface and receive moisture, such as in the outdoors, where composites generally are located, unless composites were made of recycled plastic and/or wood fibers where molds were manufactured into the composites. Due to this fact, composite manufacturers generally clearly disclose that “mold & mildew” and/or “fungus” can be an issue in their product literature. Even the newer generations of composites, commonly referred to as “Cap Stock”, which are generally made from PVC or are PVC wrapped state, “mold & mildew” and/or “fungus” are only claimed to be “resistant” and still occurs as “biofilm” on these products. Unfortunately most composite owners do not read composite literature before purchasing and installing an expensive composite, which generally state to clean at LEAST twice yearly (2X), Spring & Fall, or when stains appear, so they are unaware.
Picture of PVC “CAPPED” composite deck growing a green mold “biofilm”.
Rather, composite owners choose to believe claims that composites are absolutely “NO MAINTENANCE” and will never need to be cleaned. Unfortunately these composite owners don’t find out that most composites get dirty, with all kinds of common stains, including those from common black mold stains and other common stains until they shows up. They often have no idea what it is?
Picture of a ChoiceDek® Plus® with black mold stains rooting into the recycled PE plastic & Oak wood fibers from which it was made.
Common mold stains generally start out as black, oily looking, spots on composites when it appears. The below photo is what mold stains look like after mold spores (seeds) land on composites, receive moisture, grow and root into composites. If properly proactively Corte*Cleaned®, before the composites receive moisture, hatch, and root into the composites, it generally takes a lot less labor/time and Corte*Clean® (expense/money) to maintain a composites clean appearance.