Treated poles vs acacia poles
Even treated, the wood poles of resinous woods rot in time to the ground / air contact. This area where the water variations are most important promotes the development of xylophagous bacteria that will degrade the wood. Choose acacia poles to avoid this kind of surprise!
According to the European standard EN 335-2013, "black locust" wood is the only European wood without requiring treatment for use, in risk class 4 "Outdoor use in contact with soil and fresh water, permanently exposed to humidity "as well as tropical species such as iroko, Ipé. Nevertheless, these tropical woods arrive in Europe after thousands of miles traveled, which impacts their carbon footprint. In addition, the management of some of these forests is not always respected. At European level, two species are trying to compete with the acacia, these are oak and chestnut tree. However, these two species are classified as risk class 3, meaning they can be used outdoors but without contact with soil and permanent moisture.
In addition, in terms of the natural durability of wood, acacia is classified according to the European standard EN 350-2 as very durable, in class 1 with a durability of well over 40 years as well as Moabi, Teak or the Ipé (see table here).