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Our Wootton Bassett showroom is open for visitors by appointment. 

For cladding, beams, plank and flooring we take orders by phone and email. For collections and self-selected timber please make an appointment. Deliveries are limited to sites with easy access and forklift offload or a minimum of two people on site for manual offload.

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Brimstone Sycamore

Weathered Brimstone Sycamore CladdingBrimstone Sycamore Cladding

Weathered Brimstone sycamore cladding Brimstone sycamore | VHL7

Considered a weed by gardeners, the hardy sycamore can be found in many hedgerows and most British mixed woodland. Prized by furniture makers of old for its creamy white timber, the popularity of sycamore has waned over recent decades, leaving little demand for this fast growing white hardwood.

Brimstone Sycamore makes use of the British sycamore as a base timber to produce a silky and beautifully textured cladding and furniture timber that is ideal for external use. Being both durable and stable Brimstone sycamore is attractive and functional. As a bonus the natural ripple often found in the grain of sycamore, is accentuated by the thermal process resulting in a stunning visual affect when the sun catches the surface of the boards.

Brimstone Sycamore is a few shades lighter in colour than the Brimstone Ash (think 40% cocoa) and is ideal where a less grainy appearance is desired. The durability and colour of thermally modified sycamore make it an ideal alternative to Canadian western red cedar and tropical cladding species. However when designing pieces remember the product is more brittle than natural wood and may require different jointing and gluing techniques.

Like all thermally modified timber, Brimstone is durable above ground but it will not last well when in contact with the ground.

Brimstone overview


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 Sycamore
Base timber English sycamore
Species Acer pseudoplatanus
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 light chocolate brown colouring with a silky grain pattern. 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.
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
Resistance to impact* Medium
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

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