Tanalised timber.
TANALISED, is timber which has been impregnated with TANALITH (a combination of copper and organic biocide) wood preservative. See VAC-VAC.
Timber treated in the same pressurised chambers as for the Vac-Vac process
and is more associated with sawn timber and coloured green or brown.
Generally used for external works such as fencing, sheds, posts and cladding.