KD (Kiln Dried)
Timber dried in a controlled kiln to a target moisture content, typically 10 to 15 percent, producing dimensionally stable boards suited to interior or fine work.
Drying timber in a heated, humidity-controlled chamber to a specified moisture content target rather than relying on air drying. Kilns reduce drying time from months to days, kill borers and lyctine eggs, and produce a more uniform moisture distribution. For Australian framing pine, target moisture content is generally below 15 percent; for hardwood flooring and joinery the target is typically 10 to 12 percent to suit interior conditioning. AS/NZS 4787 covers kiln-drying performance assessment. KD timber is more dimensionally stable in service than green timber, with reduced shrinkage, cupping, and twist. For buyers, kiln-dried timber commands a premium but minimises callbacks for nail-pop, gaps in flooring, and warping. Confirm the moisture content meets the application before installing in conditioned interior spaces.
Values and references on this page are indicative and drawn from common industry sources. Always verify the current AS/NZS standard, manufacturer data sheet or NIAA policy publication before relying on figures for design, specification or compliance work.
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