The redwood's natural open cell structure allows better penetration of the treatment chemicals compared to other softwood species. Kiln drying enables deeper chemical penetration, thus offering enhanced protection against decay. This makes them ideal for fencing, landscaping, and structural applications, delivering reliable performance and a natural, attractive finish.
Understanding the stability of timber is crucial. Softwoods like redwood consist of a cell structure called tracheids. As the timber is kiln-dried, it loses free water from the sapwood, replaced by water from the heartwood until the fibre saturation point is reached. Once the free water evaporates, bound water starts to leave the cell walls, causing the timber to shrink and move. This process naturally occurs when non-kiln dried timber is exposed to varying conditions. Maintaining a constant moisture content is essential for timber stability.
Kiln drying ensures minimal movement and shrinkage by keeping the timber at equilibrium moisture content. However, timber will always adapt to the prevailing external conditions, whether it is during storage or after installation. These posts offer a superior choice for outdoor projects due to their stability and resistance to environmental changes.
