SECA Thermo-Wood Double Rhombus is a type of wooden cladding material that has been heat-treated to improve its durability and stability. The term “double rhombus” refers to the shape of the individual boards, which have two parallel faces that are angled on both sides to form a diamond shape.

The heat treatment process, also known as thermal modification, involves heating the wood to a high temperature in a low-oxygen environment. This causes chemical changes in the wood that improve its resistance to decay, insects, and moisture. The process also changes the colour of the wood, giving it a darker, more uniform appearance.