95x95 posts screwed into brackets that are themselves cast. Around the posts, there will be topsoil (bed). Since the height of the bed will be higher than the concrete brackets, these and the post will end up under the soil, which of course is not optimal. Any tips on how best to protect the post that ends up underground? One idea is to place draining stones around instead of topsoil where the actual post stands, but it might not have any effect.
The best option is to extend or modify the footing to make it higher. The next best is to have drainage. NTR-A wood can technically be below ground, but I think it still rots after a couple of years. Time flies, and it's frustrating to spend time fixing things instead of doing something new. Do it properly from the start.
This is how I've done it with my posts that had wood in the ground. The wood wasn't treated and started to rot at the bottom. The red parts are new iron extensions that make the post higher.
The best option is to extend or redo the pier so it becomes higher. The next best is to have drainage. NTR-A timber is technically capable of being underground but I think it still rots after a few years. Time flies and it's boring to spend time fixing instead of doing something new. Do it properly from the start.
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Concrete tube around the pier and iron, concrete casting around?
NTR-classified wood has a 20-year warranty, NTR-A is classified for direct contact with the ground, so that is the minimum time you can expect it to last.
That said, it's still wise to place non-moisture binding materials around, such as gravel or lecakulor. Encasing in concrete is a poorer solution.
Saw off the top of the foundation so that it becomes higher and then attach the post above ground. Encasing the post in concrete will only trap moisture, as mexitegel points out.
What type of fastening is there between the foundation and the post?
