Failure to do so can lead to blistering and cracking of the slab surface. Take care not to damage the plastic during construction. Ordering Check the weather forecast before ordering concrete. This information will help you decide if hot or cold weather precautions need to be made. As concrete temperatures increase, setting time shortens, leaving less time to complete the job.
Reduced temperatures lengthen setting time.
Concrete is ordered by the cubic yard. Errors are common when calculating the quantity required. To calculate the required volume, an irregularly shaped slab may be broken down into recognizable geometric shapes. These shapes are generally the rectangle, circle and triangle. Calculate the square feet of surface area for each individual section, and then add them to determine total surface area.