Timber roof

Glossary

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A comprehensive guide to the most common timber terms.

Interlocked grain

Grain where the angle of the fibres periodically changes or reverses in successive layers.

Irregular grain

Grain where the fibres contort and twist around knots, butts, curls, and so on. Also called wild grain.

ISO 14000

ISO 14000 is a series of standards that help organisations minimise their environmental impact, comply with environmental laws, and continually improve their environmental performance.

Isotropic

An isotropic material behaves consistently in all directions, with no variation in mechanical or physical properties regardless of the direction of applied force or stress.