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2021 Lockdown update

Following Government guidelines we are open to service trade customers, who can select and collect timber by appointment. We ask that all visitors wear masks indoors and outdoors when on our premises.

Our customer showroom is closed. For cladding, beams, plank and flooring we can take orders by phone and email. Collections only by appointment. Deliveries are limited to sites with easy access and forklift offload or a minimum of two people on site for manual offload.

Please do not visit our sites without an appointment and a mask.

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    Brimstone Poplar

    Brimstone Poplar Cladding VHL6Thermally Modified Poplar Cladding

    Brimstone poplar | VHL6 Thermally modified poplar cladding

    Brimstone poplar is a thermally modified timber-cladding made of British grown wood.

    It is durable, beautiful, truly sustainable and the lowest priced specie in the Brimstone range. Brimstone uses hardwood sourced exclusively in Britain, helping support our woodland economy. It is a renewable material, responsibly harvested and Grown in Britain certified.

    Being relatively free of knots, very durable and stable, Brimstone poplar is a great British grown alternative to imported Canadian cedar and slow grown tropical timbers.

    The poplar grows abundantly in the UK and was traditionally used for making paper and matches. It’s been under-used since those industries declined, which is unfortunate, as this species is particularly efficient at absorbing water and carbon.

    Poplar is less strong than other woods, but thermal treatment converts it into a beautiful and durable timber cladding. Poplar is the softest specie in the Brimstone range, and we recommend Brimstone Ash if a stronger material is required for decking or joinery.

    Brimstone poplar is transformed by thermal modification, a chemical free process that reconfigures wood by superheating it to over 200 degrees centigrade. The result is a stable and durable material, highly resistant to pests and rot, and certified to withstand the weather for over 30 years.

    Naturally beautiful with no maintenance

    Brimstone poplar does not require a maintenance cycle and will naturally silver over time. Thermal modification helps the timber to weather evenly, enhancing its naturally silky appearance.

    Available in a range of profiles, the clean lines of Brimstone poplar are well suited to contemporary cladding applications, and it can be fitted vertically or horizontally.

    Contact us to find out more about Brimstone, or request a quote for your project.

    Technical Specification

    Produced to comply with the harmonised standard for construction products regulation BSEN14915:2013 and to conform with BS8605-1:2014 External timber cladding: Method for specifying.

    Trade Name Brimstone Poplar
    Base timber English poplar
    Species Populus (Hybrid)
    Process Thermal modification. 210 degrees centigrade.
    Origin Legal and well-managed forests in England and Wales.
    Intended use External cladding
    Other uses External joinery and furniture
    Appearance Consistent dark chocolate brown colouring with a silky grain pattern and regular birds eye pips. The colour is further enhanced by the application of a clear oil such as Osmo UV resistant oil.
    Weathering The modification process removes most natural extractives resulting in relatively consistent weathering largely free of staining. Weathering to a grey colour occurs more quickly than on non-modified timber. When wet Brimstone poplar returns to a walnut colour.
    Profiles All machined profiles
    Dimensions 20 x 70mm, 20 x 95mm, 20 x 145mm
    Lengths Random. 1.5 – 3.0mt+
    Moisture content 2-4% (Moisture content is stable in exterior conditions)
    Natural durability (EN350-2) Very durable. Class 1
    Insect attack Thermally modified wood is resistant to insect attack when used above ground contact.
    Desired service life (BS8417) Occasionally wet 60 yrs
    Frequently wet 30 yrs
    Treatability class Resistant
    Movement class* Small (Negligible)
    Resistance to impact* Low
    Resistance to fixing High. Modified wood is brittle and should be treated with care.
    When to fix Year round. Very stable in all conditions.
    Grading BS1186-3 1990 Class 1. EN942:2007. J20. CE grade A. Clean with a few small sound knots.
    Working properties Thermally modified woods are more brittle than untreated wood. Care should be taken when cutting and nailing to prevent chipping and break out. Pre-drilling is advised. Test glues before large-scale use. Water based glues do not work well. PU glues have tested well. Otherwise treat as a normal hardwood.
    Extractives The modification process involves no chemicals and any natural chemicals in the wood are removed during the process. Thermally modified wood can be treated as inert.
    Emission of formaldehyde (EN14915) E1 (Not significant)
    Reaction to fire (EN14915) Euroclass F (Untested). D-s2, d0
    Fire treatment Untested
    CE compliant Yes

    While the utmost care has been taken to provide accurate information, Vastern Timber shall not be held responsible for any consequences arising from any errors or omissions on this website nor for any damages resulting from the use of the information.