Australia wide Readymix Concrete Suppliers
Australia wide Readymix Concrete Suppliers
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When calculating the amount of concrete you require the height of your slab is usually 100 mm (i.e., 4 inches). That is standard for driveways and house slabs. But if it is a shed slab or carrying heavy weight a thicker slab may be require.
Therefore when calculating cubic metres remember to multiply by .1, not 1
Example : if your concrete slab is 10m in length and 20 metres in width and 100mm high you require
10 x 20 x .1 = 20 cubic metres of concrete
It is difficult to calculate the exact amount of readymix concrete required in your concrete slab. The surface is often uneven, concrete can spill and slide out through your formwork. Therefore most concreting experts recommend you ADD 10% to the volume of concrete being ordered. Ordering small amounts of concrete to cover shortfalls can become very expensive.
Therefore your calculation should read
10 x 20 x .1 = 20 x 10% = 2
20 + 2 = 22 cubic metres
Check out this great video on how to calculate cubic metres
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Need more information about concrete?
Check out our Australian concrete dictionary
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