DIY Builds
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How deep should a garden 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.

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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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Browse our list of 10 ways to improve your garden shed, below. Paint your shed. Fix a water butt to your shed. Use your shed to attract wildlife....

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Are shed plans easy to follow?
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These are! They guide you every step of the way to complete your dream shed.

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Is it OK if it rains after pouring concrete?

Rain falling on top of freshly laid concrete can damage the surface and compromise a level and floated finish. Even worse, if too much extra water works its way into the concrete mix, this can result in weak concrete overall.

MASTER MIX CONCRETE

Master Mix Concrete can save you money and time on your project. We do this in two ways; firstly, we offer same and next day delivery services to our customers in Watford, Harrow and the surrounding areas, and secondly, with our volumetric concrete service, you only pay for what you use. Do you need us to visit your site to supply a quote? Don’t hesitate to call us today and we can arrange a free of charge site visit, no strings attached! This means that you never have to go over budget by underestimating your concrete needs ever again, nor will you be pushed behind schedule by underestimating you requirements and having to wait for another delivery. Our service is quick, efficient and cost-effective, making the day-to-day running of your business that bit simpler.

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Yes, with the right plans you can build your dream shed.

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Shed Cost by Size Size Average Cost (Labor Included) 10' x 20' (200 sq.ft.) $10,000 12' x 16' (192 sq.ft.) $9,600 12' x 24' (288 sq.ft.) $14,400...

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