1. What do you need to look out for? Ordering in good time
Since the posts are salt-impregnated using the boiler pressure method, a so-called “setting time” (which can last to 6 weeks, according to the specific requirements of the respective manufacturers of the wood preserver and also according to weather conditions) must be adhered to before installation, during which time the wood preserver components merge with the wood fibre. If the setting-time is not adhered to, the wood preserver can wash out, with the consequence that the protective effect is no longer guaranteed.
There is no difference whether the wood in question is pine or spruce – both types of post have the same described advantages. For the lifespan and consequently the productivity of vines and fruit trees, the quality of the untreated wood and the impregnation are important. The latter is essentially determined by the radial penetration of the wood preservative into the wood. Before purchase make a sample cut (never at the top end-high penetration depths are always reached here!), or take a sample with you. Test the penetration depth, which should amount to several millimetres!