Appearance
Brimstone sycamore is a consistent brown colouring with a silky grain pattern. The wood may contain occasional small sound knots.

Weathering
The modification process removes most natural extractives resulting in relatively consistent weathering that is largely free of staining. Weathering to a grey colour occurs more quickly than for non-modified timber. Surface mould sometimes grows on south facing elevations; this can be neutralised various treatments or white wine vinegar.

Desired service life
Occasionally wet 60 yrs. Frequently wet 30 yrs.

Movement class
Small

Resistance to impact
Medium

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.

Density
550 Kg / M3

Extractives
The modification process involves no chemicals and most naturally occurring chemicals in the wood are removed during the process. Thermally modified wood can be treated as inert.

How to fix
Hand nail with stainless steel nails through the face or through the tongue on suitable profiles. Alternatively use a second fix nail gun and insert two nail per batten at opposing angles. For more information, visit the resource centre.

Batten type
Treated softwood. 35mm thick x 50mm wide

Batten spacing
400 – 600mm

Nail type
Stainless steel only. 50mm ring shank nails for hand nailing or 50mm second fix brad nails if using a gun. Trim head stainless steel screws are also suitable.

When to fix
Year round. Very stable in all conditions.

Resistance to fixing
Medium. Modified wood is brittle and should be treated with care.