ThermoWood® Pine Decking

Silva ThermoWood® Pine is an attractive, sustainable solid wood decking material produced using a chemical-free natural process involving heat and steam. Finnish-grown European Redwood (Scandinavian Pine) is heat-treated to temperatures in excess of 200 degrees Centigrade. This thermal modification process makes it durable, dimensionally stable, resin-free, and even changes its colour to a pleasing warm brown. The improved properties of Silva's ThermoWood Pine make it an ideal material for use in exposed external areas such as decking. 

Silva’s ThermoWood Pine decking is smooth all round and has grooves on the sides to accept a clip system (also available). The side grooves make it possible to install with no fixings visible on the surface of the deck. It can also be installed in the conventional method using deck screws fixed through the face of board.

Silva’s ThermoWood Pine decking has a stylish appearance and feels pleasant underfoot, even in hot conditions. No chemicals are used in the production process, so it is entirely free of toxins, making it a safe play surface for children.

Thermal properties: According to VTT tests, ThermoWood Pine’s thermal conductivity λ10 is in the region of 0.099 W/(m K). The corresponding value for untreated kiln-dried European Pine is 0.12 W/(m K).

Raw material: Silva ThermoWood Pine is produced from high-quality PEFC certified Nordic Pine (Pinus Sylvestris). It is grown in the central belt of Finland, one of the best areas in the world for tree growth. Sub-zero winters alternate with short warm summers, which results in slow growth.

The slow growth provides the best possible straight-grained timber: branches and therefore knots are few, and those that exist are small. Growth is symmetrical, and trunks are straight and round. Growth rings are thin and tightly-packed. The amount of juvenile wood is little and heartwood high. The result is a hard, robust, and straight-grained timber with low internal tension and minimal cracks. The low-resinous, evenly patterned Finnish wood is first-class material for ThermoWood Pine production.

Grading: To ensure Silva ThermoWood Pine decking meets the highest quality standards, only specially selected sound (live) knotted wood is used in the production process. The quality of sawn timber is controlled with a general grading system according to the number, quality, location, and size of the knots and other features. The quality grade used to produce Silva ThermoWood Pine is A/B. Read more about grading and quality here.

Sourcing/certification: The raw material is sourced from well-managed and sustainable forests fully certified under the Pan European Forestry Certification (PEFC) scheme.