A roll-off bin is a usually open top rectangle shaped dumpster sometimes with wheels to allow for easy placement of the dumpster. These containers are designed to be delivered and removed by roll-off trucks. Roll-offs dumpsters are commonly used to contain and remove loads of construction and demolition waste, concrete or and soil. Some roll-off containers are not open top and are used with commercial or industrial trash compactors.
Construction debris may originate from a building site where something is being built, renovated, or demolished. Roll-off dumpsters are also used for various jobs that need a great deal of material to be taken away. The material in the roll-off bin may be taken to a landfill, recycled or disposed/recovered of in some other way.
Typical container sizes are 10 yard, 15 yard 20 yard, 30 yard, and 40 yard. While the roll-off bins may be rented by volume, there may be weight limitations. Weight limits may be necessary to ensure compliance with road and safety regulations.
Most roll-off providers will have a weight limit for each container size. Containers loaded with more weight than allowed typically result in an overage charge. The maximum weight is specified at the beginning of the job. In cases where the material to be disposed of is especially dense, such as concrete, a container with lower sidewalls is used, to help reduce the risk of exceeding the weight limit.
After the container is picked up, it is taken to a disposal facility where it is weighed before (gross) and after (tare) dumping. The difference is the net weight, and is used to calculate charges to the customer. In order to save time, some facilities pre-record weights of trucks and containers. This allows the tare weight to be looked up and eliminates the need for a second weighing.
Roll-off dumpsters are delivered and placed by a roll-off truck. As the roll-off truck raises its hydraulically operated bed, the roll-off container slides off of the truck bed. A cable is used to slowly lower the container. After the waste container is loaded, the roll-off truck pulls the filled container onto the roll-off truck by using a cable and winch system. When being transported, the roll-off must be covered.
One problem often encountered with roll-off containers is the potential of scratching or damaging the surface they are placed on. Most roll-off containers now have metal rollers for wheels, which can at times scratch or be abrasive to a concrete or asphalt surface. It is recommended to place a protective board such as plywood under the container to avoid and situation where the placement surface can be damaged. Most roll-off companies do not offer plywood, but will place the container on the wood if supplied. The roll-off must be placed on a hard surface other than dirt. Gravel, asphalt, and concrete are all acceptable. If the container is placed on dirt the bin may sink after a rainfall and the truck could get stuck.
There are many items that are not accepted by roll-off bin rental companies. These items include but are not limited to chemicals, including paint and petroleum products, tires, and electronics.
The prohibition of items is often to comply with laws and regulations concerning disposal of hazardous materials. Roll-off drivers may refuse to pick-up loads containing prohibited materials. If the load is picked up, the roll-off rental company may charge the customer additional for cleaning the load and proper handling of the contaminating material.
Most cities do not require permits to have a dumpster delivered.