In all but the lowest of decks, the minimum size for deck posts should be what dimension?

The minimum size for deck posts is crucial for ensuring the structural integrity and safety of the deck. A dimension of 6x6 inches is typically required for posts that support significant loads, which is often the case for decks that are elevated or intended for regular use. This size provides adequate strength and stability, capable of withstanding various environmental conditions, including wind and snow loads, as well as the weight of the deck and any furniture or occupants.

In contrast, smaller dimensions such as 4x4 inches may only be suitable for small, low decks with minimal loads. Using a larger size, like 8x8 inches or 10x10 inches, may provide more strength than necessary, but it also adds unnecessary weight and cost. Therefore, 6x6 inches strikes a balance between functionality, safety, and material efficiency for most typical deck constructions.