Made to last
Differences in manufacturing processes also lead to variations in performance characteristics. The plastic in composite decking products serves as the binding agent, while the wood fibres add stiffness, reduce flammability and help simulate the look of natural wood. Most commonly, manufacturers mix wood fibres with plastic and then heat and extrude the material into deck boards. Each manufacturer has its own process; therefore, each product differs in makeup and appearance.
The plastic is what protects the wood fibre from moisture, so its ability to surround and bond to the wood fibres during the manufacturing process can significantly impact the long-term integrity of the decking. Should wood fibres become exposed over time, the deck boards can absorb moisture and be susceptible to mould, mildew, discolouration and, in some cases, decay.
To prevent this from happening, some manufacturers use a total encapsulation method wherein wood fibres are aligned and completely enclosed by plastic. The finished product absorbs substantially less moisture than other composites and solid wood, and has greater rot and insect resistance. Composite deck planks manufactured in this manner can be used in applications where direct contact with the ground (landscape trim) or water (pool and spa surrounds) is necessary; otherwise it must be elevated to avoid direct contact.
Compared to all-plastic decking, composite products provide lower thermal expansion, further supporting the material’s performance in harsh environments. For example, in variable climates, wood-plastic composites may be more suitable for decking than plastic materials, as the latter tend to expand and contract more with temperature changes.
Composite materials also resist splintering, twisting, splitting and cracking, which makes the material suitable for children’s play equipment, access ramps, outdoor showers and in recreational facilities, where safety is a concern. Its firm, non-slick surface holds up well to heavy foot traffic, and under typical conditions, composite decking is expected to last two to three times longer than traditional decking materials.
Residential and commercial warranties vary and can range in coverage from five years to lifetime. Read through warranties carefully to determine what the manufacturer covers and to ensure there are no surprises down the road.
