The level of preservative treatment is varied according to the Use Class situation that the timber is exposed to during its service life. Generally, a greater degree of protection is required as the Use Class increases. Use Class 4 is required for ground contact or fresh water contact. e.g. fence posts, decking joists and landscape sleepers.
Our range of fence posts and sleepers give added confidence to your fencing and landscaping project.
Our posts are incised prior to preservative treatment, which means we add small, uniform incisions into the post. This allows the treatment to penetrate the post and protect it against rot, making it suitable for ground contact – Use Class 4. If the posts are not incised, they will not be protected against decay and therefore won’t last as long, which is why all James Jones fence posts are incised as standard and come with a 15 year warranty.
James Jones pioneered the introduction of incising technology in the UK.
Preservative treatment provides wood with added durability. However, it’s a mistake to assume that
all pressure treated wood is the same. Whilst one piece of treated wood may look very much like
any other, the level of preservative protection could be very different. That’s because the British
Standard for wood preservation – BS 8417, requires that the loading and penetration of preservative,
impregnated into the wood, is tailored to the desired end use.
The Wood Protection Association in collaboration with Timber Trade Federation have published further information on understanding timber treatment, which can be downloaded below -
WPA guidance notes are also available
via the free online library