Frequently asked questions
Does Water Go Through Composite Decking?
Compared with wooden boards, composite boards offer greater longevity and superior resistance to rot, insects, and warping. Although composite decking is highly resistant to moisture-related issues, it is not entirely waterproof.
Premium quality composite boards have a protective outer layer, commonly referred to as a cap. This cap is usually made from plastic and resin and provides a durable and moisture-resistant shield. It helps to prevent water from seeping into the board’s core and protects it from stains, fading and mould growth.
However, the cap is not entirely impervious to water and may still be susceptible to moisture absorption over time. The quality of the cap can affect how water-resistant the board is, so it pays to source your materials from a trusted, reputable, high-quality supplier. It is also important to waterproof under the composite decking boards.
In short, composite decking is not entirely waterproof. But it is much more water-resistant than traditional timber decking. While composite boards are designed to resist moisture, they are not immune to the effects of prolonged exposure to water or extreme weather conditions.
What Joists should you use for Composite Decking?
Typically, composite decking joists are manufactured from one of three materials: aluminium, timber, and composite.
Aluminium joists are by far the best option for construction professionals who prioritise joist strength, longevity, reliability, and performance, but desire a lightweight, versatile material. They boast a fantastic lifespan and excellent durability, minimising the maintenance required over the product’s lifetime and effectively minimising the need for replacement. Though there are other joist options for composite decking as well.
