The firmer the base material under the block, compounding the amount of weight it can hold.

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The common deck blocks are typically 12 x 12 inches square with slots molded into the top to allow for the insertion of the foundation. Gravel provides the best drainage of the three options. However, most concrete deck blocks can only hold 4x4 posts, not 6x6s and they have no lateral strength at the base of the post.

For stronger build, dig deck blocks into the ground and level with gravel or limestone. Consult all local building codes. To make a better bond between the concrete and the block, wet the block.

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How to use concrete deck blocks for a shed base. These are deck blocks, which contain slots to hold the lumber framing the base of the shed. Supports corners and cross framing members.

Sand under a deck block. Measure the distance between two joists at the ledger or beam. Use a trowel to fill the hole and slots in the deck block with concrete.