The key benefit of using softwood for applications that demand high durability while maintaining its ecologically benign qualities is that softwood can be thermally treated.

Characteristics of thermally modified wood:

• According to European Standard EN 350-2, non-durable (class 5) softwood species can be used to produce durability classes 1-3.
• The biological resistance to the majority of microorganisms and insects has improved.
• Swelling and shrinkage are minimised by 50% to 90%.
• The hue of the treated wood has deepened.
• In contrast, there is a 30% reduction in bending strength.
• In principle, all wood species can be subjected to the heat treatment procedure.

The following dimensions of thermally treated ash decking are available from the ZIRO firm.

• 1800 / 2400 x 112 x 20mm (Brushed)
• 1800/ 2100/ 2400 x 132 x 20mm (Smooth)