You will find different types of stones and rocks used for rock pavement.
4 to 5 inches rip rap rock is the smallest available. It is screened down and crushed to 4 to 5 inches in size. Due to its smaller size, the rock is a good option for making a reliable and stable base. This kind of rock might be used near ditches.
6 to 9 inches rip rap rock is somewhat bigger and is the commonly used type of rip rap construction stone for shoreline erosion prevention. This rock is not suitable for walking on and can be utilized to discourage people from going to particular areas. Rocks in this size can also be great options for making a retaining wall.
9 inches rip rap rock is a bigger construction stone. They are picked for projects where land sliding or erosion is a big problem. Big rip rap rock might be placed together with areas with fast currents or places prone to high volumes of mudslides and precipitation.