Page 179

Landscape and exteriors Cladding

“Most modification processes enhance the durability of wood against decay fungi. Some modified woods can provide service lives equal to or longer than preservativetreated wood or some naturally durable timber species.”

T

imber is an excellent choice for an external cladding application. Providing the selected species meet the preferred natural characteristics that benefit the performance of a cladding system, a diverse selection of timber is available. There has been an increase in the range of material choice for external timber cladding in recent years given the growing trend for use of timber in this application. One particular sector of the timber industry that is soaring in popularity is the development of modified woods, which have several benefits that make them a preferred material for external timber cladding.

Benefits of modified woods One of the main drivers for wood modification has been to improve the decay resistance of low-durability timber species, including those grown in Europe. These species normally require preservative treatment to achieve acceptable service lives for many applications. However, apart from improving durability, wood modification may also result in several other beneficial changes to wood properties, including: • improved dimensional stability, and therefore minimal distortion risks • improved aesthetics • increased hardness. These changes have improved both the performance of particular timber species and their range of applications. In particular, the durability and the improved dimensional stability mean that modified woods are well suited to an external cladding application.

Durability Wood durability is the ability of wood to resist attack by wood-destroying organisms. More durable timber species will provide a longer service life. It is an important property to consider when using wood for applications where it is at risk from decay and, since decay fungi are considered the greatest pests of timber in service in the UK, testing the resistance of modified woods against these has received most attention. >> www.trada.co.uk

Timber 2019 Industry Yearbook

| 177

Profile for BM TRADA

Timber 2019 Industry Yearbook  

The annual publication of the Timber Research and Development Association (TRADA) includes topical and technical features on all aspects of...

Timber 2019 Industry Yearbook  

The annual publication of the Timber Research and Development Association (TRADA) includes topical and technical features on all aspects of...

Profile for trada
Advertisement