Will a Composite Decking Board Rot?

M. John

Will a composite decking board rot? Since wood can rot if you expose it to moisture, you might have wondered if composite decking will rot too. Rotting is peculiar to wood; unlike wood, composite decking boards cannot rot. Composite deckings are resistant to rot even if you expose them to moisture. This property gives the composite board an advantage over wood decking. To understand why the composite board does not decay, let’s see what composite decking is.

What is Composite Decking 

The word composites mean a combination of two different materials. Ultradecking composite board consists of two different materials. It is not like wood decking that is pure wood. Composite decking contains wood particles and recycled plastic material. The combination of these two materials made the composite decking board superior to wood decking.

Composite decking floor installed beside a small garden
A Brown composite decking project, installed beside the garden without fear of rot.

Wood is naturally beautiful, so is composite decking. But a composite board can stay more beautiful for decades than wood. Apart from that, composite decking is more durable than wood. It is resistant to splinter and will not crack. Also, because composites are stronger, composite boards can not warp like wood.

Composite boards are also easier to maintain than wood. If you have a composite deck, you can easily maintain it without spending much money. It is not like wood that you have to sand before treating it to make it last longer. Also, composite decking has a prolonged lifespan compared to wood boards. Although you can treat a wooden board to make it last longer, it can’t stay as long as composite decking.

Lastly, wood can rot or decay, but a composite deck can not rot. It takes us back to the question as to whether composite decking will rot. The answer is no. The composite decking board will not rot. Let’s see why composite decking does not rot.

Why Composite Decking Does Not Rot

Composite decking will not rot because it is durable and resistant to water or moisture. The composite decking board consists of wood fibre and plastic material. These materials are combined with a bonding agent to form a durable composite decking board. The wood in the decking gives the decking board its strength, while the plastic in the decking board makes it resistant to water.

Wood decking, on the other hand, differs from composite decking. Wood decking that does not contain plastic-like composite decking. Wood will swell if it absorbs water or moisture. And will eventually rot over time.

The material will rot in the presence of water or moisture. When water soaks the material, the material will rot eventually. Still, composite decking, on the other hand, will not rot since it is resistant to water, making it difficult for it to rot like wood.

Types of Composite Decking Board

However, there are two types of composite decking material you can use in building a deck. Here is the capped and uncapped composite decking board.

Capped Composite Decking

Capped composite decking boards have high water resistance. This is the most common type of composite decking homeowners prefer. One reason is that the capped composite decking has a plastic coating on its outer layer. The plastic coating around the capped composite decking board makes it difficult for water or moisture to penetrate it.

Because they have high resistance to water or moisture, the capped composite decking board is suitable in high moisture areas. You can install it by the dockside or by the poolside without worrying that the decking will swell. They have a high water resistance due to the plastic coatings and will last for a very long time.

Uncapped composite decking

The uncapped composite decking board is not like the capped composite decking. It differs from the capped decking as it does not have a plastic coating around it. Uncapped composite decking boards are less resistant to water than capped composite decking. They are not suitable for use in places with high moisture. But this does not mean that the uncapped decking will not last for long. They are also durable and will last for a very long time.

However, the uncapped composite board is suitable in areas with less moisture. So, if the place you want to install your deck is dry, the uncapped composite decking board will be suitable for building a deck. Also, if you are planning to build the decking over a shaded area, you can use the uncapped composite board. The roof will protect the decking and keep it from absorbing water.


Will a composite board rot? No. The composite decking board is resistant to rot. It is resistant to water or moisture, which in turn keeps the board from rotting.

Tags: Rot resistant decking

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