How big should a shed slab be?

How thick does the concrete slab for my shed need to be? The most common thickness for a shed slab is 150mm (6 inch), with one layer of reinforcing mesh. This is adequate for any farm machinery such as tractors.

actionsteel.com.au - What Is The Required Concrete Slab Thickness For A Shed? - Action Steel

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Can I build my own shed?

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If you think your shed will require a thicker slab, we can engineer a slab to suit whatever purpose.

How much will the concrete slab for my shed cost?

As a rough guide, a 150mm thick slab will cost between $90 – $120m² (in rural areas). Although a 125mm thick slab may be adequate in many situations, we believe it is best to go with a 150mm slab as the extra thickness is not overly expensive. For example, over 100m² of concrete slab, only another 2.5m³ of concrete is required to increase it from 125mm to 150mm thick – which only equates to about $500 difference! It also pays to keep in mind that thinning the slab out under workbenches and work areas requires more preparation, so it is normally more effort than it is worth. Repairing concrete slabs is also quite difficult, so ensure you don’t skimp on the thickness, as it could cost you more in the long term in maintenance – particularly in high-traffic machinery workshop sheds.

Should I install the concrete slab before or after my shed is built?

We generally recommend an ‘infill’ slab – which is poured after the shed is completed. This allows the concrete to form around the wall cladding at ground level and seal off the shed, helping to make the shed rodent-proof and help minimise the amount of dust and dirt that enters the shed. Installing an infill slab is a potential cost saving too, as this method can be easier for the concreter as it requires less boxing up.

Site and shed pad preparation

Remember that regardless of the slab thickness that you choose, it is essential to start with a well-prepared site. Your slab will only be as good as the foundation. You can learn about the top 10 tips for preparing a shed pad, in the video below.

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How far can a 2x4 floor joist span without support?

So, for 2x4 at 12” oc the maximum span is about 7'-6”, which is about the distance you need. (If you go to C24 it could be longer.)

diy.stackexchange.com - What is the max span that can be supported by 2x4 floor joists?

We had old 2x4 floor joists sitting in our bathroom that we ripped out as they were rotten and falling apart. 2x4 is ideally our limit of thickness, and I was thinking of having 4 or 5 2x4 joists going from one end of the wall to another (147cm / 58") bolted to a 2x4or 2x6 (not sure which one) bearer against all 4 walls. The bearers will be thunderbolted to the brick walls and joist hangers will be used for the 2 by 4s. I have a very poorly drawn picture from myself to illustrate the 2 by 4 joists. We're thinking about putting the joists 30cm (12") OC.

How much weight can this take? Is this adequate for a room that is 7 ft 9 inches?

Based in the UK.

See a video of the floor.

https://streamable.com/2wbrxk

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These are! They guide you every step of the way to complete your dream shed.

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