While not required, we suggest a solid and secure perimeter frame to hold the stone in place.

Gravel under deck blocks. I live in pg county, md. The space is about 32 by 15. There is a significant amount of clay in the soil, so i am putting gravel under the pier blocks.

The common hollow core block that sizes out at 8 x 8 x 16″ is often used as a shed foundation. Compacted gravel around wood posts allows for adequate drainage and keeps water away from the wood which helps to prevent rot and extend the life of the deck. If your rocks are such that when you pour concrete, the rocks get fully.

I have been asking for estimates, and they are all over the place. It certainly possesses better drainage than topsoil, but it is naturally not as efficient as gravel in this respect. These are deck blocks, which contain slots to hold the lumber framing the base of the shed.

7 best weed barrier under gravel 2023. A concrete deck block can support quite a bit of weight as it normally has a footprint of 12 x 12 inches. If you’re unsure about which foundation is best for.

Options for the perimeter fram include pressure treated timber (4x4, or 4x6) secured. There should be a minimum of 4” of crushed stone under all. You can read a full overview of shed footings here.

Sand is a good compromise to use as a surface under your floating deck. The gravel will allow water to drain away from the base of the blocks, further decreasing the chance of frost heaving, and also give you an easy way to adjust the level of each block to get. To make a better bond between the concrete and the block, wet the block.