Having sold composite decking for more than 15 years, we’ve amassed considerable knowledge about it. While we are ardent advocates for these decking solutions, it would be remiss of us not to share the various disadvantages they can present. Armed with this information, you can make a well-informed decision about whether composite decking is suitable for your project. The disadvantages listed below have been compiled over 15 years of both supplying and installing composite decking in residential and commercial properties.
15 Disadvantages of Composite Decking
Fading Due to Sunlight Exposure
Composite decking, while known for its durability and longevity, is not impervious to the effects of prolonged exposure to sunlight. Over time, the vibrant colour and finish of the decking can begin to fade, leading to a less aesthetically pleasing appearance. This fading is attributed to the UV rays in sunlight, which break down the chemical bonds in the decking material, causing a change in colour. While some newer models of composite decking come with UV-resistant coatings, the long-term exposure to direct sunlight can still diminish their vibrancy, making it an important consideration for outdoor spaces that receive ample sunlight.
Unsuitability for Painting
Unlike traditional wood decking, composite decking is not designed to be painted or stained. This is due to its unique composition, which includes a mixture of wood fibres, plastics, and binding agents. These materials are combined and colour-treated during the manufacturing process to provide a finished product that does not require additional painting. However, this means that once the composite decking is installed, the colour and finish are permanent, and any desire to alter the appearance or refresh the colour through painting is not feasible, limiting the customisation options for homeowners.
Warping in Hot Weather
Composite decking materials can be prone to warping and bending in extremely hot weather. This occurs because the plastic components within the decking expand at a different rate to the wood fibres when exposed to high temperatures, causing the material to distort. Such warping can lead to an uneven surface, which not only affects the aesthetics but can also pose a tripping hazard. While high-quality composite decking is engineered to minimise these effects, in climates with high temperature fluctuations, this can still be a significant disadvantage to consider.
Timber Subframe Rotting
One of the less obvious disadvantages of composite decking is its potential impact on the timber subframe beneath. Composite decking itself is resistant to rot, but if it is installed over a timber subframe, moisture trapped between the composite decking and the timber can lead to the subframe rotting over time. This is particularly problematic in areas with high moisture levels or inadequate drainage. Therefore, it’s essential to ensure that the subframe is treated for moisture resistance and that there is sufficient ventilation to prevent moisture accumulation.
Heat Retention in Prolonged Sunlight
Composite decking can become uncomfortably hot underfoot when exposed to prolonged sunlight, more so than traditional wood decking. The plastic content in composite decking absorbs and retains heat, which can make it difficult to walk on barefoot during sunny days. This can be a significant drawback for decking areas intended for relaxation or play during warm weather. Selecting lighter colours can help mitigate this issue to some extent, as they absorb less heat than darker shades.
Difficulty in Repairs
Repairing composite decking can be more challenging than fixing traditional wood decking. Due to its manufactured composition, individual boards of composite decking cannot be sanded down or refinished like wood. If a composite deck board becomes damaged, it often requires replacement of the entire board, which can be costly and may result in colour mismatches over time due to fading. This makes the repair process not only more difficult but also potentially more expensive and less aesthetically pleasing.
Higher Upfront Costs
One of the primary disadvantages of composite decking is its higher initial cost compared to traditional wood decking. The manufacturing process of composite decking, which combines wood fibres with plastic components, is more complex and resource-intensive, leading to a higher price point. While composite decking can offer long-term savings due to reduced maintenance requirements, the initial investment can be a significant barrier for some homeowners, making it important to weigh the long-term benefits against the upfront costs.
Limited Residual Value
While composite decking can enhance the aesthetic appeal and functionality of an outdoor space, it does not significantly increase the resale value of a property in the same way that natural wood decking might. This is partly due to the personal preferences of potential buyers, some of whom may prefer the natural look and feel of wood over composite materials. As such, the investment in composite decking should be considered more for personal enjoyment and less as a financial investment in property value.
Artificial Appearance Compared to Natural Wood
Despite advancements in manufacturing techniques that allow composite decking to closely mimic the look of natural wood, there remains a discernible difference in appearance. Some individuals find the composite decking to lack the authentic charm and warmth of real wood, which can be a drawback for those who value the natural aesthetic. The manufactured texture and uniformity of composite boards can sometimes appear too perfect or synthetic, lacking the unique variations and character found in natural wood grains.
Potential for Slippery Surfaces
Composite decking can become slippery when wet, posing a safety risk in rainy climates or around pool areas. This is due to the smooth, plastic-based surface of the decking, which can lack the natural friction provided by traditional wood grain. Manufacturers often address this issue by incorporating textured finishes or anti-slip coatings, but the effectiveness can vary, and some products may still present a hazard in wet conditions. It’s essential for homeowners to consider the slip resistance of composite decking, especially in areas where water exposure is frequent.
High Stain and Scratch Potential
Despite its reputation for durability, composite decking is not immune to stains and scratches. The surface can be particularly susceptible to marks from heavy furniture, pet claws, and general wear and tear, which can mar the appearance over time. While some higher-end composite decking options come with protective coatings to mitigate this issue, the potential for damage requires consideration, especially in high-traffic areas or homes with pets and children.
Maintenance-Free Claims Aren’t Entirely Accurate
Although composite decking is often marketed as a low-maintenance alternative to wood, it’s not entirely maintenance-free. It requires regular cleaning to prevent the buildup of dirt, debris, and mould, especially in shaded or damp areas. While it doesn’t need sanding, staining, or sealing like wood, neglecting basic maintenance can lead to issues that compromise the deck’s appearance and longevity, making it important for homeowners to understand the level of care required.
Immense Quality Variation
The quality of composite decking can vary significantly between manufacturers and product lines, leading to disparities in durability, appearance, and longevity. Some lower-quality composite decks may fade, scratch, or degrade faster than higher-quality options, making it crucial for consumers to conduct thorough research and select products from reputable manufacturers with solid warranties and proven track records of performance.
Damage from Expansion and Contraction
Composite decking materials can expand and contract with temperature changes, which may lead to cracking, splitting, or warping over time if not properly accounted for during installation. The expansion and contraction can also affect the integrity of the deck’s structure, necessitating precise spacing and installation techniques to accommodate these movements. This characteristic underscores the importance of professional installation and may add to the overall cost and complexity of the decking project.
Susceptibility to Mould and Mildew
While composite decking is resistant to rot and decay, it can still be susceptible to mould and mildew growth, especially in damp or shaded areas. The porous nature of the composite material can trap moisture, providing a conducive environment for mould and mildew to thrive. Regular cleaning and ensuring adequate ventilation and drainage can mitigate this issue, but it remains a consideration for homeowners, particularly in moist or humid climates.
Mitigate These Disadvantages with Co-extruded Composite Decking:
Wood and Beyond’s Supremo WPC Decking leverages cutting-edge co-extruded technology to address many of the common disadvantages associated with traditional composite decking. This advanced approach in the composite decking industry combines unique properties and high resistance with a wood brushing effect, crafting a product that is both aesthetically pleasing and exceptionally durable. Unlike conventional composite decking, our co-extruded boards exhibit minimal colour fade, ensuring the decking retains its character and appeal over time. Key advantages of our Co-Extruded Decking, compared to standard WPC decking, include significantly enhanced anti-scratch performance—approximately 3-4 times better. Moreover, our Co-Extruded boards boast 0% water absorption, starkly contrasting with the 2% absorption rate of typical WPC boards, thereby mitigating the risk of mould and mildew growth. Additionally, the expansion rate of our decking is notably lower, reducing the likelihood of damage due to temperature-induced expansion and contraction. With these superior qualities, Supremo WPC Decking by Wood and Beyond stands out as an exemplary choice for those seeking to overcome the traditional limitations of composite decking.
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FAQ
Can composite decking fade over time when exposed to sunlight?
Yes, composite decking can fade over time due to prolonged sunlight exposure. UV rays from the sun can break down the chemical bonds in the decking material, leading to a less vibrant appearance. However, selecting composite decking with UV-resistant coatings can help mitigate this effect.
Is it possible to paint or stain composite decking?
Composite decking is typically not designed for painting or staining. Its composition includes a blend of wood fibres, plastics, and binding agents that are colour-treated during manufacturing, making the colour and finish permanent once installed.
How does composite decking respond to high temperatures?
In extremely hot weather, composite decking can be prone to warping and bending due to the expansion of plastic components at a different rate than the wood fibres. High-quality composite decking is engineered to minimise these effects, but it’s still a consideration in areas with significant temperature fluctuations.
Does composite decking get hot when exposed to the sun for extended periods?
Yes, composite decking can become hot underfoot in prolonged sunlight, more so than traditional wood decking. The plastic content in composite decking absorbs and retains heat, but selecting lighter colours can help reduce heat absorption.
Are there challenges associated with repairing composite decking?
Repairing composite decking can be more challenging than repairing traditional wood decking because individual boards cannot be sanded down or refinished. Damaged composite deck boards often require complete replacement, which can be costly and result in colour mismatches due to fading.