Does Mold Grow on Composite Decking?
Composite decking is the most popular decking material in modern home environments. It has become a top choice for outdoor spaces thanks to its outstanding durability and low-maintenance properties. More and more homes have been enjoying the convenience of composite decking. However, you may have a question: can mold grow on composite decking?
Yes, mold can grow on composite decks. But it’s not a big problem. In this article, we’ll cover composite decking’s mold resistance. Read this composite deck mold prevention guide. You can solve your deck’s mold problem with the right prevention and cleaning solutions.
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Table of Contents
Why Does Composite Decking Get Mold?
Mold, as a microscopic fungus, is widespread in nature. Its spores are spread by the wind. Once it finds a suitable growing environment, it multiplies rapidly. Traditional wood decks are extremely susceptible to mold. This is because the porous structure of wood itself absorbs and retains moisture. At the same time, the cellulose of wood provides rich nutrients for mold.
In this regard, composite decking is much better. Its plastic composition effectively blocks moisture penetration. In addition, spores have a hard time surviving and multiplying on the surface of composite decking. Of course, even the highest quality composite decks can still develop mold spots on the surface under certain conditions. This is usually not a problem with the material itself. Rather, it is the result of a combination of environmental factors and maintenance practices.
In short, composite decks are not “mold resistant” in the sense that they are completely mold-free. It means that it is significantly more resistant to mold than traditional wood. In addition, it is easier to remove mold from the surface without causing substantial damage to the structure of the material.
Mold Growth Conditions
To understand the mold problem on composite decking, you first need to understand the scientific mechanism of mold growth. In general, these four conditions below affect the rate of mold growth.
Environment
The impact of environmental factors on the growth of deck mold cannot be ignored. Decks located in areas of high humidity or year-round shade are more prone to mold problems. In general, areas with dense trees and the shady back side of buildings are high-risk areas for mold growth.
Additionally, deck areas that are often covered with items (such as planters and areas of carpeting) are also areas that need to be inspected frequently. These locations not only have high humidity, but are also poorly ventilated. As a result, the surface of the deck dries slowly, creating an ideal environment for mold to grow. Seasonal factors are also critical. Mold activity is particularly active during the warm, rainy seasons of spring and summer.
Material Composition
Mold growth on decks is closely related to their material composition. Composite decking is made from a mixture of wood fibers and plastic polymers. The plastic composition makes it effective in resisting mold infestation. In addition, the surface of the capped composite decking has an additional protective layer. It isolates the inner wood fibers from the outside environment. Molds cannot get the nutrients they need to grow, even if they land on the surface.
Design and Installation
The way a composite decking board is installed and designed can also affect its mold resistance. For example, a suitable deck gap is reserved for installation. On the one hand, this can cope with the expansion and contraction of the composite deck. On the other hand, this is to ensure good air circulation. Ventilation and drainage of the space below the deck are also important. In short, improper installation significantly increases the risk of mold growth.
In addition, the design of the deck surface also has an impact on mold growth. The more grooves there are, the more likely the deck is to accumulate organic matter and debris. Of course, this isn’t much of a problem. That’s because mold can’t get through composite deck surfaces. All you have to do is clean it more thoroughly.
How can I Prevent Mold and Mildew from Growing on My Composite Decking?
The first thing you should know is that preventing mold is more important than treating it. Comprehensive prevention can radically reduce the chances of mold growth. If you want to keep your deck clean and beautiful for a long time, please follow these preventive measures.
Choose The Right Composite Decking
When purchasing a composite deck, take care to choose a manufacturer with good mold resistance. Products from Trex, EVODEK, and TimberTech typically excel in this regard. In addition, for particularly wet or dark environments, consider capped composite decking.
Capped composite decking offers better stain resistance. What’s more, its protective layer blocks moisture from coming into contact with the interior wood fibers. Although the initial investment is high, it saves a lot of maintenance costs and time in the long run.
Use The Right Installation Process
Many mold problems stem from improper installation practices. Always follow the manufacturer’s recommendations for board spacing. Typically, a gap of about 1/4 inch should be maintained between panels. The use of hidden fasteners will ensure even and consistent spacing.
It is also recommended to use composite joists that are well ventilated. This will prevent moisture from building up underneath the deck. When it comes to installation location options, avoid building your deck in a dark and damp area if possible. In addition, you can also consider adding drainage measures.
Regular Cleaning
Even composite decks, which are known for being low-maintenance, need to be cleaned regularly. A thorough cleaning is recommended at least once a season. In rainy and humid areas or seasons, the frequency of cleaning should be increased. Begin cleaning by removing all furniture, pots, and decorations. Remove leaves and debris from the deck surface with a soft-bristled brush or broom. Then scrub with soapy water or detergent.
Pay special attention to cleaning the gaps between the boards. This is where debris and organic materials are most likely to accumulate. Rinse thoroughly after cleaning to avoid cleaning agent residue. This regular maintenance not only removes organic matter that harbors mold and mildew, but also keeps the deck looking like new.
Inspecting and Adjusting Deck Items
Additionally, routine inspection and adjustment of certain areas can significantly reduce the risk of mold. For example, avoid having items such as flower pots and cushions fixed in the same position for long periods of time. You should move them regularly to prevent moisture buildup underneath.
Use metal or plastic supports to elevate planters in the area where they are placed. This will not interfere with bottom ventilation. During periods of particularly wet weather, consider using an absorbent mop or squeegee to speed up the drying of the deck surface.
How do I Remove Mold from my Composite Decking?
If you already have mold on your composite deck, you don’t have to worry. The special structure of composite decks makes mold treatment relatively simple. With the right approach, you can fully restore the appearance of your deck.
Before removing the mold, you need to choose the right cleaner according to the deck manufacturer’s instructions. These cleaners are effective in breaking down the mold without damaging the surface of the deck. For less stubborn mold, you can also use soapy water for cleaning. Cleaning generally involves the following steps:
- Sweep the deck surface to ensure it is free of debris and crumbs.
- Spray or apply the cleaner evenly to the mold area and let it sit for 5-10 minutes.
- Thoroughly scrub stubborn areas with a soft-bristled brush and finally rinse off with water.
Conclusion
Mold on decks not only affects aesthetics but also poses a health hazard. Composite decks are more resistant to mold than traditional wood decks, though. However, surface mold may still appear in damp, dark environments. The key to preventing mold lies in choosing quality mold-resistant materials and installation methods. In addition, it is important to clean up mold when it is found to prevent continued growth.
With proper selection, installation, and maintenance, composite decks can be mold-free. In addition, if you want to avoid the threat of mold completely, choose capped composite decking. It is more resistant to mold. EVODEK can provide you with samples of various types of composite decks.
FAQ
Can I Clean Moldy Composite Decks with Bleach?
No, it is not possible. Bleach kills mold, though. However, it may discolor the composite deck or damage the protective surface layer. Therefore, we prefer to use a specialized composite deck cleaner or soapy water for cleaning.
Can a High-pressure Water Gun be Used to Clean Composite Decks?
A high-pressure water gun can be used to clean the surface of composite decks. However, it is important to note that the cleaning is done with a fan-shaped nozzle and at an appropriate distance from the deck. This will prevent the high-pressure water jet from damaging the texture of the composite deck surface. In contrast, a regular garden hose is a safer option.
How can I Prevent Mold under my Deck Furniture?
Moving your furniture regularly will prevent moisture buildup due to prolonged shading. You can also use furniture supports with a ventilation design. This promotes air circulation and prevents the growth of mold.
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