The Negatives Of Using Composite Decking

The Negatives Of Using Composite Decking

One of the most asked questions by the layperson in our field is what are the primary differences between using a composite material and using Redwood or any other natural lumber for your deck? To accurately answer this question I would like to focus on the biggest negatives that are associated with composites.

Your Deck Will Sag

The first major disadvantage is that your composite deck will be susceptible to sagging since the material, generally a plastic mixture, will be unable to hold as much weight as its natural cousins. After all, your deck will only last as long as the wood that supports it.

Sensitivity to Temperature

When choosing a wood for your deck it would be beneficial to understand that composite building materials are prone to temperature changes that can cause either expansion or contraction depending on the weather. Redwood lumber on the other hand does not change size making it the premier choice when thinking about not only cost but about the safety of your deck. 


A common misconception is that composites are much more friendly priced than Redwood. The opposite is actually true; with Redwood lumber pricing in very competitively and composites putting a bigger constriction on your wallet. 


Mold is also a disadvantage of composite decks. If the composite material is largely infused with wood, it will absorb a lot of moisture. This moisture absorption will lead to mold problems over time. Many people have complained about this because they are unable to get rid of the mold problem. While mold can sometimes be a big problem, one of the biggest problems occurs when the deck becomes damaged.


The primary disadvantage of using a composite material is that your deck will be heavily susceptible to damage. If you live in a climate that is moist or wet during a majority of the year you may find that your deck will need work in no less than 2 years from the time of completion. Unlike Redwood, which can be easily repaired, composites require complete replacement making them a very costly option in the long run.

We hope that you make the well-informed decision when choosing your materials whatever your choice may be.