Have you installed composite decking and notice dark spots spreading on the surface? Those dark spots can be a result of mould growing on your composite decking. True, engineers made plastic wood decking strong and durable, but mould can sometimes grow on the surface. Failure to maintain plastic wood decking can cause mould growth, and installing the old, uncapped composite decking can also cause mould growth on the surface. If you discover mould thriving on your composite decking top, there are steps you can take to remove it. So, how do I get mould off composite decking? 

Composite Decking and Mould Growth

In recent times, engineers have made composite decking to resist mould and mildew. This they do by coating the composite boards with an extra layer of plastics. The plastics form a protective shell on the composite decking surface, preventing moisture and fungus from entering the boards. Before the newer generation composite decking was developed, there was the old-generation decking. This decking type does not have plastic protection, and moisture and mould will reach its wooden part. 

Old generation plastic wood decking is susceptible to mould attack. When spores of the fungus that causes mould growth reach the decking surface, it immediately destroys the wood part of the decking. If you installed the old generation plastic wood decking, there is a high chance that mould will destroy it. Another thing that can cause mould growth on composite decking is failure to maintain it. Every structural material needs maintenance, and so does composite decking. 

Installing plastic wood decking outdoors will expose it to the elements and fungus in the air. When fungus comes in contact with organic materials like leaves or twigs on your decking, they will cause decay. Homeowners that don’t remove leaves, food and twigs from their decking surface should be prepared for mould growth. Mould will eventually decompose your decking and cause serious structural damage to it. 

How Do I Get Mould off Composite Decking?

Preventive Measures Against Mould

There are several ways homeowners can prevent mould growth on composite decking. One way is by installing the modern or newer generation composite boards. The other way is to clean the surface of your composite decking regularly.  

Install Newer Generation Composite Decking

Newer generation composite decking was developed to solve the problem of the old decking. This outdoor decking type has a protective shell made of a thick plastic coating that stops moisture and fungus from thriving on your decking. Moisture causes a damp condition on your decking surface if it infiltrates the boards. And when the top of your plastic wood decking is damp, mould will easily grow on the surface. Newer generation plastic wood decking will not become damp when water spill on the surface. Moisture will not infiltrate the boards. So, the chance of it becoming damp and creating the right condition for mould is slim.

Clean Composite Decking Regularly

When homeowners refuse to clean their plastic wood decking regularly, they leave it exposed to decay and mould. Leaving things like food dropping, leaves and twigs on your plastic wood decking surface is a bad practice. To prevent mould from destroying your composite decking, you must sweep leaves and food droppings from the top. If water spills on your wood-plastic decking top, you should clean it immediately.

Getting Mould Off Composite Decking

If, after installing your plastic wood decking, you discover mould growing on the surface, you should not hesitate to remove it. Mould, if left unchecked, can decay the composite decking surface. You can utilise soapy water and a brush to remove mould by scrubbing the spot. Or, you can use vinegar to remove mould from your decking surface. Note that you should not use bleach to clean your plastic wood decking top, as this will remove the colour. Use the right soap your decking manufacturer recommend that you use to clean your decking. 

You should pre-rinse the plastic wood decking with your hose to remove the mould before scrubbing. After, you can mix two-part of vinegar with one part of the water in a bucket. Then you should pour the vinegar solution on the mould and sprinkle baking soda on the spot. Then, use your brush to get the mould off the composite decking surface. After getting the mould off your composite decking surface, rinse the decking thoroughly. 


How do I get mould off the composite decking surface? Prepare a vinegar solution and pour it into the mould. Then scrub your plastic wood decking surface with a brush until you have removed mould off it completely.

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