Changes to timber treatment standards, a critical view

摘要

In April 2014 a new version of BS 8417, the UK standard for treated timber was published, the main changes concerned a strengthening of the 30 year desired service life specification for use class k (in ground contact) treated timber. Changes to the standard focus on chemical penetration.For products in ground contact, with a desired service life requirement of 30 years, the standard requires 6mm penetration in exposed heartwood of Douglas fir and larch. It seems to imply that the only, or at least the best, route to compliance for achieving a 30 year desired service life is through incising.