Millboard FAQ's

Please see below for some of the commonly asked questions, if you need more information please call or email us.


  • What is Millboard?
    Millboard is a game-changing decking product, hand made in the United Kingdom & molded from real oak timbers, creating an incredible realistic look that captures the natural beauty of wood. But unlike traditional timber - which needs regular on-going maintenance like oiling & sanding to try and stave off rotting, mould, stains, warping, cupping, fading, splinters & a host of other undesirable effects - Millboard is totally different!

    What Makes Millboard different? Unlike traditional timber, or even conventional composite decking WPC (which typically contain half timber fibre / flours / rice husks & half plastic) - Millboard contains no timber, nor any plastic. Millboard composite decking is made from a revolutionary Polyurethane resin, reinforced with mineral fibres plus a unique Lastane® coating. So what is Polyurethane then? It's a type of elastomer, which is a polymer about half way between a plastic and a rubber. It maintains the rigidity & longevity of plastic, with the suppleness of rubber. This means Millboard feels much more natural under foot, while still offering incredible durability.

    Find more about Millboard decking here:
  • Where can Millboard be used?
    Millboard decking is extremely versatile and can be used in practically every outdoor space imaginable - think decks, balconies, roof gardens, boardwalks, bridges, pontoons, seating, steps, planters and more. Millboard can also be used indoors for many applications.

    It is not recommended to use Millboard in structural applications. Millboard decking would need to be fixed to a structural frame, either made of timber or ‘Plas-pro’ recycled plastic.
  • Millboard vs Real Wood decking
    For an in-depth comparison between Millboard and real wood decking read here
  • Millboard vs Composite decking
    For an in-depth comparison between Millboard and traditional composite decking read here


  • How do we know Millboard will perform in NZ?
    Millboard was launched in the UK in 2006 and was designed with product performance in mind, unlike most traditional composite decking. Over the years Millboard has been used in projects from the cold of Scandinavia to the heat of Dubai and the humidity of Singapore with superior performance.

    Millboard has been successfully used in projects across Australia since 2012 and finally reached NZ in 2018. Why only in 2018? Prior to this Millboard couldn't keep up with the global demand for their product, and New Zealand wasn't a simply wasn't a priority. Now with a new high-yield factory in operation, Millboard is sold in over 16 countries worldwide and has been used in thousands of projects across the globe.
  • How will Millboard handle NZ's UV?
    In New Zealand's extreme conditions most decking materials will fade to some extent - whether natural or man-made. Millboard has been UV Stability tested to BS EN ISO 4892-2:2006 with a result of 2% LRV (shift over 5000 hours) which is deemed Exceptional. It's safe to say that in comparison to timber or other composites, Millboard offers best-in-class outdoor performance.
  • Does Millboard expand and contract?
    The expansion and contraction rate of Millboard planks is very minimal compared to solid timber decking and traditional composite decking. Millboard decking has a core made from a unique resin mineral composite which has a very low expansion and contraction rate of less than 0.1% (similar to concrete).

    Thanks to the minimal expansion and contraction, Millboard planks (176 and 200mm wide) can be installed with as little as 4mm gap between lengths, which is very minimal for the width of the planks. In comparison, a 6-8mm gap between lengths is recommended for most solid timber decking planks between 130-140mm wide, and a 5mm gap between lengths is commonly recommended for traditional composite decking between 136-140mm wide. With Millboard you get wider boards and narrower gaps - a better look overall!
  • Does Millboard decking get hot in the sun?
    CAUTION – In high temperatures or prolonged bright sunlight Millboard decking (especially the darker colours) can become hot. Please exercise caution before walking barefoot on to Millboard decking in circumstances where the decking is in high temperatures and exposed to sunlight. In these circumstances, it may be necessary to use footwear. Special caution should be taken when using Millboard decking in areas where there is heat/UV reflective glass.
  • Can Millboard be used in snowy or icy conditions?
    Yes! You can use a small amount of granulated white salt to keep your Millboard decking ice-free. Please don’t use rock salt, as this contains clay and grit and can be abrasive. When winter’s over, clean the surface with soapy water and a soft broom.
  • Can I use a fire pit / bowl or patio heater on my deck?
    In instances where there is burning wood or coal they will need to sit the fire bowl / brazier onto a porcelain or cement tile / slab. The slabbed area needs to extend about 1m outside the fire bowl / brazier. Any embers or burning material needs to be removed immediately to prevent any damage or lasting marks to the Millboard surface. Patio heaters or infra red heaters are not know to affect the Millboard.
  • Is Millboard slip-resistant?
    Yes, Millboard's unique Lastane® surface – a soft elastomer coating – has been carefully developed to provide a tough surface that greatly enhances slip resistance in wet conditions. In BS79.76 slip resistance tests, all styles of Millboard decking achieve one of the highest possible slip-resistant ratings. Millboard is also resistant to algae growth which can often contribute to slipperiness with other decking types.
  • Does Millboard Decking mark?
    The Lastane® finish is highly resistant to scratches, food and drink stains, and everyday wear and tear. Sharp objects such as unprotected table or chair legs, spiked shoes or metal planter bases can leave marks if dragged across the surface, so take care when moving these items around. As with most decking products there is a risk of marking from strong dyes and stains such as berries and animal droppings, however the risk can be reduced if the item of concern is removed as soon as possible.
  • Are the Millboard colours consistent between batches?
    Millboard batches can vary slightly in colour due to the complicated process used to achieve the depth and variation of colour across the boards. As with all decking it is best to buy all you need at one time. If working with different batches we recommend distributing the different boards evenly throughout the area you are installing.
  • What impact does Millboard have on the environment?
    Millboard decking boards are ideal for use as part of a sustainable design strategy. Their extended design life dramatically reduces the need for repair and replacement. Millboard as a company is focused on continued sustainability and have become the first premium outdoor flooring company in the world to have their carbon footprint independently verified. The embodied carbon of Millboard decking has been verified as 1.31kg / CO2e per m2. Millboard is an ISO 14001 certified company, complying with international environmental management practices. They are the only carbon-verified premium timber-free outdoor flooring material in the entire world.
  • How long will Millboard last?
    Millboard decking boards can typically last up to 35-40 years (subject to environment), whereas timber typically lasts 10-15 years.

Care & Maintenance

  • Do I need to seal my Millboard deck?
    No, all Millboard decking is surface-sealed in the factory to ensure they arrive in premium condition. In the first few weeks of use, rainwater will sit on the surface in globules, but don’t worry – this is normal and will stop once the temporary surface seal breaks down.
  • Does Millboard require maintenance?
    Unlike wood decks that require continuous maintenance, there is no need to restain, apply weather protectants or water seal products to Millboard Decking - Millboard decking is designed to stay looking fabulous year after year.
  • How do I clean my Millboard deck?
    Over time, dirt, dust, leaves and other debris may accumulate on the surface of your Millboard deck. To clean your deck you can simply use washing up liquid mixed with water and and a stiff bristle broom - there’s normally no need for pressure washing. To remove spills and marks, simply use a mild detergent and a brush. Beware of using any solvents, chemicals or abrasive cleaners that could damage the surface. For more information on Maintenance click here to watch Millboard's maintenance video.
  • What happens if a Millboard plank gets damaged?
    Millboard supply touch-up paints for each decking colour they produce - this can be applied to smaller surface scratches as a means of repair. If a board is seriously damaged you may prefer to removed it and replace it with a new board. A board can be removed by prising the board up, allowing the fixings to pull through the bottom of the board. The fixings should then be unscrewed from the subframe. Finally, a new board can be installed. For more information on replacing a board click here to watch Millboard's informative video.


  • How does the price of Millboard compare to timber decking?
    Upon purchasing, Millboard may appear more expensive than timber decking. However, if you take into account its greater durability, increased lifespan and reduced maintenance requirement, the life cycle cost of Millboard is considerably less than that of timber decking. Timber decking boards typically last 10-15 years, and would need to be replaced more than once over the life-span of a single Millboard decking board. In addition to this, a Millboard deck will never need to be restained, painted, varnished or sealed.

    Millboard decking also provides a consistent quality, appearance, strength and stability, as opposed to timber decking which can vary wildly in quality and appearance, planks are not equally strong or stable, and there's always the risk of warped or bowed boards.
  • How much does Millboard cost to install?
    The subframe material and installation labour costs of Millboard are comparable to traditional decking.


  • How is Millboard installed?
    Millboard decking is incredibly easy to install. Using standard tools and Millboards 'How to' video to guide you, you'll be able to construct an amazing outdoor space that will last for years to come!
  • What tolerances should be allowed?
    There will always be a slight variance in the board’s dimensions due to the fact that we mould from natural oak, and due to the pressure of the foam. Despite this we calibrate the boards to maintain as consistent a profile as possible. The tolerances to allow are: Width: ± 3mm. Length: ± 5mm. Thickness: ± 2mm The dimensions of the Weathered Oak style may vary more between moulds due to the fact that they are moulded from timeworn oak with minimal changes to the dimensions.
  • What fixings should be used to install Millboard?
    Millboard is recommended to be fixed with ‘Durafix’ self drilling stainless steel screws. With these ingenious screws there is no need for pre-drilling or countersinking and the unique Lastane® surface coating covers back over the screw hole, leaving a virtually indistinguishable mark. Click here to watch Millboard's disappearing screws in action.
  • Can Millboard decking be cut just like wood?
    Millboard decking can be cut with standard saw blades, although we recommend a carbon-tipped, multi-purpose chop saw. As the formed end of the board is lost when cut, these can be placed in less visual areas against a wall or edging profile. Matching Touch-up Coating for exposed ends is available to buy separately.
  • Can I use an impact driver?
    We advise against using an impact driver to fix the Durafix® screws to the decking as this can break the drive bit and screw head, as well as impede the board from being fixed directly against the subframe.
  • What sub-frame base system should be used with Millboard decking?
    The ideal companion is our all-weather composite decking is Plas-Pro, a durable, hard-wearing and practical sub-frame material for spaces exposed to damp such as jetties, fishing platforms, pools, roof terraces and boardwalks. The Plas-Pro Millboard sub-frame system is made from 100% recycled plastic, which means it won’t rot, split or crack.
  • What is the different between Timber Joists and Composite Joists?
    Timber is the most commonly used sub frame material, and most have a 15 year warranty. However this is only under ideal circumstances and if the cut elements are retreated. In applications where the timber is in contact with the ground or has limited airflow then this will impede on the durability, and in some cases reducing it down to 1/3 or it’s intended lifespan. At Millboard we recommend to use a wood free alternative to maximise the durability of your sub frame system. We have provided the Plas-Pro system, and 100% recycled plastic non-rot profile. When using this as an alternative to timber bear in mind that the structural spans are not equivalent. Please refer to the Plas-Pro brochure or Installation Guide for further details. If in doubt then contact a member of our technical team on [email protected].
  • Can I use a standard board as an edging piece?
    Yes you can, where the edge is merely aesthetic, such as a balcony edge, if this is your preferred finishing option. However, where the edge is likely to sustain impact, such as a step, we do not recommend using a standard board. Our edging boards have been specifically designed with high impact in mind and as such have a thicker Lastane® surface to withstand the knocks and scrapes associated with step edges and other associated applications.


  • Fire Safety
    All types of Millboard decking has been tested by BBA, certificate 17/5409 for use as Decking Boards and certification and testing has been to this end.

    Millboard decking has been tested to BS EN ISO 13501-1:2007+A1:2009 and has a Bfl-S1 reaction to fire classification (fire test for flooring). Millboard decking is not recommended for use as cladding on buildings 18m (6 storeys) or above, and for other cladding use, it should be subject to Building Regulations to check suitability, use and proximity.

    For a full Fire Safety report see here
  • Slip Ratings
    In BS79.76 slip resistance tests, all styles of Millboard decking achieve one of the highest possible slip-resistant ratings. Millboard is also resistant to algae growth which can often contribute to slipperiness with other decking types.


  • Does Millboard Decking have a Warranty?
    Yes, you can register for a warranty from Millboard within 90 days of your Millboard installation. You will be issues with either a 25-year Residential Warranty or a 5-year Limited Warranty depending on the installation application of the boards. For more information on Millboard warranties, click here.

Samples & Purchasing