How much concrete do I need?

Slabs and bases

A shed base 3m x 2m at 100mm thick is 3 x 2 x 0.1 = 0.6 cubic metres. A driveway or anything carrying vehicles usually needs a thicker slab and often reinforcement, so check the design before ordering.

Strip footings

Multiply the trench length by its width by its depth. Trenches rarely come out exactly to size, so allow extra — over-dig in soft ground can add a surprising amount.

Post holes

For a round hole, volume is 3.14 x radius squared x depth, all in metres. Subtract nothing for the post itself on small sections; the allowance is useful spare.

Mixing on site or ready-mixed

Small volumes are usually mixed on site from cement and aggregate. Once you are into larger pours, a single continuous placement gives a better result than many small batches. Either way, work out the volume first — that decides which route makes sense.

Cold and wet weather

Avoid placing concrete on frozen ground or when frost is forecast before it has gained strength, and protect a fresh pour from heavy rain. In hot, dry weather, keep it damp so it cures rather than dries out.

Not sure what to order? Send your measurements through our quote form and we will work the quantities out with you, or call the yard on 01483359553.