You can attach the post to a metal ground anchor that is driven into the ground and holds the post slightly above ground. Another option for soaking the post is to drill a hole in the post near the ground. Not a through hole but halfway and then fill with wood oil in the hole and then put a plug in the hole. In this way, it soaks itself.
If you are going to bury impregnated posts, you should buy pointed and impregnated posts that are ready-made. If you point them yourself, you cut away the impregnation.
In the past, before impregnation was available, a fire was made to char the part of the post that would be in the ground. This was done because charcoal is difficult for nature to break down, much harder than wood.
If you dig a hole and fill the bottom with gravel to drain it a bit, and char the post, it should last well enough. Not forever, but you should gain a few years from it.
Or you can bury concrete bases if you're not in the mood to experiment
In the past, before impregnation was available, a fire was made to char the part of the post that would be in the ground. This was done because charcoal is difficult for nature to break down, much harder than wood.
If you dig a hole and fill the bottom with gravel to drain it a bit, and char the post, it should last well enough. Not forever, but you should gain a few years from it.
Or you can bury concrete bases if you're not in the mood to experiment
Dig a hole about 60 cm. Screw some lag screws halfway down the post. Place the post in the hole and pour in coarse concrete. The lag screws act as reinforcement. The posts should not absorb water causing the paint to peel. However, I hope that before you painted your wood, you let it sit for about 2 summers? Otherwise, there is a high risk that the wood is "wet" after impregnation, meaning it won't absorb the paint properly. Therefore, the paint will start to peel.
Cutting a treated post shouldn't matter when you set it down, so you can definitely taper it yourself. The important thing is to choose wood that is NTR A-rated and not just AB, as most of it is. Posts in 70x70 and 95x95 are usually A-rated, while the rest of the beams and decking are normally AB. And for those curious, AB is above ground, and A is approved for ground contact, meaning it can be buried or lie directly on the ground.
Use Class A treated wood and then apply linseed oil to the part that will remain in the ground for an extended period by letting it stand in a bucket of linseed oil.
That way, it will last at least 15-20 years unless you live in a swamp.
That way, it will last at least 15-20 years unless you live in a swamp
.No French screws needed. Make a suitably sized hole, insert the post, brace with supports in two directions so that the post stands straight, fill the hole with concrete, let the concrete set for 3-4 days, remove the supports, done. Touch up with paint next summer when it's really dry.