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Pier Foundation for a Shed

by Bill
(Arlington, Texas, USA)

I have to build my 10' x 10' shed close to a tree with exposed roots so I am going to elevate it and I was thinking of using concrete blocks to build it on.

I bought a Heartland "Rainier" kit with 2x3 boards to make floor with but as it is rather large I am concerned about the blocks sinking into the ground and was thinking about putting the blocks on top of some sort of gravel after tamping down the ground with some sort of heavy object.

How many blocks should I use. Are blocks even a sound idea? I read about the plastic sheet under the shed and thought that was a good idea. does the plastic sheet go under the blocks or attached to the bottom side of the floor. There is standing water after it rains so that is also a consideration as I can not stop that. Also I have a clay soil.

Thank you for your consideration

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Pier Foundation for a Shed

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by: John - Admin

Hi Bill,
Thankyou for your question.
Firstly with regard to the option of whether to use concrete blocks or a plastic shed base I think that the concrete blocks sound better in this case as you will construct the base of the shed up of the ground so that it doesn't get soaked when water starts to pond.

For constructing the concrete block piers dig a hole 3" deep and 18" diameter, compact the soil in base with a tamper and place a 3" layer of gravel in the bottom. This will help drainage beneath the block and also help to spread the load into the soil beneath.

I would say that you would typically have 9 blocks arranged in 3 rows of three with a 6x2 on each row to support the 3x2 floor joists. However I am not exactly familiar with the type of floor you are using so you may want to ask a bit more on this or send me a sketch.

I hope this helps, let me know if you have any more questions.

All the best

John

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