Rail - 12ft (75mm x 38mm)

Measuring the area you want to add aggregate to can be quite daunting, we have added some information here that may help you.
It is very important that you order approximately 5% - 10% extra aggregate for filling odd spaces and to cover the inaccuracy of measurements.
To measure the area, its a good idea to make a sketch to assist you with your calculations, multply the average length by the average width and depth to determine the amount of aggregates you will need.

The factor used in the calculations is 1.6 and all values are rounded up to the nearest full bag.