Prevent lateral movement by digging the higher part of the gradient deeper than the lower end so that the deck can level out. If the ground slopes slightly downward, no matter the material used for foundation, there’s a high chance for lateral movement. Level ground is ideal, but not always possible. On the other hand, heavy clay soils will hold too much water affecting the integrity of the deck block foundation. These soils will let the excess water drain away during autumn and prevent frost heaving during the winter, remaining largely unchanged despite the seasonal freeze and thaw cycle. Deck blocks placed on sandy or gravel-like soils work best. Here’s a good explanation video showing how to use deck blocks to give you an idea of how these are used.Īll things being equal, deck blocks are safe.
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