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Laying Composite Decking on Concrete: Is it Possible?

Laying composite decking on concrete is all about preparation and resisting the temptation to cut corners. It is possible to install composite decking on concrete, but a simple assessment with a spirit level could be the difference between uniform and uneven installation. 

In this article, we discuss the reason why laying composite decking directly on concrete is inadvisable, and why you should instead lay composite decking over concrete with the help of a sturdy subframe.

What is a Subframe and why Should you use Them?

A subframe is responsible for providing your composite decking with structural integrity and strength under pressure. They help to distribute weight, prevent pressure, and promote airflow and drainage.

Rather than installing your composite decking on concrete and leaving it susceptible to forming stress points that could break the boards, subframes evenly distribute and direct force and pressure. 

Furthermore, if you lay your composite decking directly on concrete, water could pool and lessen the lifespan of the decking. Although composite decking is largely manufactured from recycled plastics, water-logging can lessen the lifespan of your decking. So airflow and water drainage are essential.

What are Subframes Made of?

Traditional subframes are made of timber. But due to their susceptibility to wood rot, many homeowners are opting for plastic and composite posts and joists as an alternative.

We sell a range of coloured plastic subframes here at Assured Composite that are rot-resistant and capable of withstanding prolonged water exposure. But aside from rotting, there are several reasons you may choose to install composite subframes:

  • Longevity

As composite subframes are made mostly from recycled plastic, it is generally far longer lasting than traditional wooden subframes. They are waterproof, strong, and weather resistant. Which makes them the preferred choice for subframes to support composite decking on concrete. 

  • Made for Drainage 

Composite subframes don’t warp or crack thanks to their weather resistance and are designed to be hollow for water run-off and absorb far less water than traditional alternatives. 

  • Easy Installation

Composite subframes can be drilled through and easily screwed into place. Making the installation process faster and more simple as a result. 

  • Adjustability

As we previously mentioned, although you may not be able to see it with the naked eye, the concrete you lay your composite decking on may be uneven. Fortunately, the adjustability of composite subframes makes it possible to level your concrete surface without time-consuming excavation work. 

Custom-built pedestals can allow you to adjust your subframes as necessary to create a flat surface. 

Installing subframes rather than laying composite decking directly on concrete is recommended for this reason. 

How do you Install Composite Decking on Concrete?

If you’d like to find out more about laying composite decking on concrete, please see our installation and care guides for comprehensive advice on laying composite decking over concrete. So you can achieve a seamless look and finish to make your composite decking look amazing. 

If you’d like to receive more information about how to lay composite decking on concrete, please don’t hesitate to contact us. We’re happy to offer any further guidance you may need.