TS EN 844-10

TS EN 844-10 is the part of the round and sawn timber terminology series that defines terms relating to stain and fungal attack. It brings together the general commercial expressions used to describe discoloration, fungal effects and related conditions in timber products, helping technical communication remain consistent across languages and contexts.

Why these terms matter in timber practice

In timber trade and specification work, stain is not always the same as strength loss, but it can affect appearance, grading decisions and market acceptance. Fungal attack, by contrast, refers to biological influence on wood and may range from superficial effects to more serious deterioration depending on the situation. Standardised terminology is therefore important for classification, product description and reporting.

What this part covers

• This part of the standard covers terms and definitions relating to stain and fungal attack.
• The definitions are intended for general commercial use in European Standards.
• As a terminology standard, its main purpose is to define concepts rather than prescribe a test method or processing rule.
• It is Part 10 of the TS EN 844 series for timber terminology.

In broader technical context, separating discoloration from fungal damage helps avoid confusion in grading and trade descriptions. Some stains are associated with environmental exposure, while fungal effects are more closely linked to moisture, storage conditions and timber preservation. By setting common definitions, this standard supports clearer use of wood-technology language. TS EN 844-10 was adopted from EN 844-10:1998 and later withdrawn.