A fully loaded concrete truck can carry up to 10 cubic yards of concrete. Depending on how thick the concrete slab is, 10 cubic yards of concrete can cover an area between 270 and 810 square feet.
Concrete contractors with a lot of experience know how important it is to order the right amount of concrete to finish a job, so they take care to get it right. Because job sites aren’t always perfect, contractors usually order 10–15 percent more concrete than they need to cover spills, uneven ground, and movement of the form.
This often means that there is extra concrete after a pour is done, but having too much is better than not having enough. When there isn’t enough concrete, workers have to wait around for the truck to come back and the contractor has to pay more.
When a contractor orders less than a full load of concrete, the concrete company adds an extra fee to the total bill. When a concrete truck drops off a load, it has to pay certain fixed costs. These costs are paid for when the truck is carrying a full load. When the truck isn’t carrying a full load, these costs aren’t covered. To cover the full cost of delivery, an extra fee is added.