How to build base foundation for shed?

jim6

Hi All,

I am planning on putting a shed at the back of my property and need to decide on the base to use. The shed is 2.8m x 2.2m and the land has a decline of 25cm. The two options I am currently thinking about is to either a low profile deck using something like tuff blocks but I am questioning whether it will not get enough airflow and be still too high to put the mower in and out or build up the base using sleepers to fill with road base and concrete pavers on top.  Any suggestions on the best way or if there are other options?

EricL

Hello @jim6 

Shed manufacturers have very definite requirements when it comes to shed bases. I recommend looking at the assembly manual and see what they suggest. I would recommend going with a concrete base for two main reasons. First is longevity, there is no reason to worry about rot, mould or mildew affecting the concrete base. Second, if the base is constructed properly with a raised floor no rainwater will enter the shed.

In regards to the slope, this will be the only thing you'll need to address when building the slab. I propose cutting into the soil and building a low-level retaining wall to support the area that has been dug out. Once you have the soil level this can serve as the base for the concrete base for the shed. 

Here is a handy step-by-step guide: How to pour a concrete slab by @tom_builds 

I've placed a sample image of the slab with a raised section to give you an idea of how it can be built. You'll notice that there is a raised section of the slab this is the interior size of the shed floor. In essence when the shed is assembled this raised section is inside the shed thereby preventing any rainwater from flowing in. You can also see the small retaining wall at the back.

If you have any other questions we can help with, please let us know.

Eric