Technical drying

Technical drying (kiln drying, KD) refers to the controlled removal of moisture from wood in enclosed chambers. It shortens drying times, reduces residual moisture, and increases dimensional stability—crucial for decking, furniture panels, and substructures.

Why Technical Drying is Important

Technical drying takes place in drying chambers or continuous systems where temperature, humidity, and air circulation are precisely controlled. This allows residual moisture to be set accurately (typical for decking boards: ~14% ±2%), which significantly reduces warping, cracking, and dimensional changes. Compared to air drying (AD = air dried), drying times are shorter and the final result is more uniform, which is particularly important for long-format boards or glued panels.

Differences: Kiln Drying (KD) vs. Air Drying (AD)

With kiln drying (KD), wood dries in a controlled manner in heated chambers; with air drying (AD), moisture reduction occurs through natural air and weather conditions. KD enables precise target values for moisture content and shortens storage time before further processing. AD can be sufficient when long storage times are possible and no very precise moisture profile is required, but the risk of uneven drying and greater warping remains higher.

Brief definition:
Air dried (AD) = natural air drying outdoors;
Kiln dried (KD) = technical, kiln-supported drying.

Technical Details and Effects on Wood Quality

Drying is often a two-stage process: pre-drying outdoors followed by final drying in the kiln. Modern KD processes use temperature and humidity sensors and controlled air exchange, sometimes also steam cycles to relieve stress in the wood. The result: better dimensional stability, less movement, and reduced shrinkage/swelling—factors that are crucial for decking, furniture making (e.g., teak panels), and load-bearing substructures. For outdoor constructions, a precisely set moisture content is important, as the wood adapts to the local climate and initial shrinkage is reduced.

Practical Tip: What Does This Mean for Planning and Processing?

When purchasing and installing decking or furniture panels, it’s worth asking about the drying process: KD woods are more dimensionally stable and work less after installation. At Betterwood, decking boards are typically kiln-dried (residual moisture ~14% ±2%), and controlled drying in drying rooms usually takes place before further processing. This means all boards and most of the substructure offered are kiln-dried, which increases their suitability for deck construction and outdoor applications. For detailed questions about individual wood species, gluing, or care, we recommend checking the respective product pages.

Sources:
BauNetz Wissen – Holztrocknung,
Holz vom Fach – Fachwissen/Glossar