Skip to main content

What makes Millboard composite cladding unique?

Millboard composite cladding is 100% wood-free, so it doesn't need sealing to prevent moisture ingress. Using a unique fiber-glass reinforced resin-mineral composition, Millboard achieves the finest quality of finish, balanced with usability and maximum durability.


This gives Millboard composite cladding many of the unique benefits our decking products have, allowing it to outperform even nature itself, with no other cladding solution being anything like Millboard - composite or otherwise. Read on to explore our two composite cladding ranges, Shadow Line and Board & Batten.

Envello Shadow Line

The grooved profile created between boards gives visual definition to the individual grain patterns.

The Shadow Line board has been designed to perfectly replicate smooth timber with a flat grained finish, giving a clean authentic look. The increased width of the Shadow Line board compared to standard timber boards means that there is larger grain detail. This gives an enhanced visual impact, without the risk of the board twisting or warping over time. The Shadow Line board has been profiled with oblique angles to prevent water collecting between two profiles, as well as helping rain water wash over the face of the cladding. The indent created between boards gives visual definition to the individual grain patterns.Typical usage requires 1.53 boards per m².


Envello Shadow Line+

An advanced offering over the standard Shadow Line, to provide a fire rated cladding system.

Shadow Line+ has been developed to look almost identical to our standard Shadow Line boards shown throughout this brochure, but with enhanced properties and a fire classification. Tested to the rigorous demands of BS EN 13501-1, the Shadow Line+ system achieves a classification of Euroclass D. The fire rating on the Shadow Line+ not only covers the cladding boards but also includes the accessory items through a full system build-up, this includes new Reveal Boards, Corner Profiles and Coloured Head Screws. The formulation of the Shadow Line+ still continues the unique overall Millboard composition of a resin mineral mix, however has now been specially formulated to achieve the fire rating.


Envello Board & Batten

A truly unique balance for both contemporary and traditional designs.

Our Board & Batten collection has been moulded from individual pieces of timber with a range of different masters, creating a truly unique balance for both contemporary and traditional designs. With a tongue and groove profile that only requires fixings through the tongue, the install time is dramatically reduced compared to the traditional method of timber batten-on-board cladding. The profiles on the Board & Batten are designed with differing angles to create shadow definition between the grain patterns, as well as facilitating drainage when used horizontally. Typical usage requires 1.53 boards per m².


Fire performance of the Envello cladding ranges

The Shadow Line+ cladding boards have been tested to BS EN 13501-1 and have a classification of D-s3, d0. The Board & Batten and Shadow Line ranges are also crafted with fire retardants in the board composition, but they are NOT fire rated and carry no ‘reaction to fire’ certificate.

The responsibility for the cladding’s suitability in the required location is to be determined by a certified building professional (building control, building insurance, fire officer, etc). Millboard will not be held responsible for incorrect specification, application, or product installation in areas not in accordance with government guidance, in the UK or abroad. Current guidance should be gained from the government website relating to the geographical project location, England’s building regulation Approved Document B can be found on - https://www.gov.uk/government/publications/fire-safety-approved-document-b

Back to top