Poured in place rubber has been used in playgrounds throughout the world as a safety surface for decades now.
Poured in place rubber should be installed on a hard surface like asfalt or concrete, but it can also be mounted on a base of crushed stone. If you are choosing poured in place rubber for playground sites then it is a great choice.
It consists of two layers:
1) The bottom layer is usually referred to as SBR or Buffing consists of shredded rubber and acts as a cushion. The thickness of this layer depends on the height falls in the area. It also depends on the manufacturer of the material. For example, in areas where there is play equipment that is 4 feet tall, the manufacturer may recommend that the buffing should be 1.5 inches thick.
2) The top layer is called layer of clothing, and usually consist of so-called EPDM (ethylene propylene diene monomer), which is a type of synthetic rubber.
First buffing is mixed with a binder, usually in a mortar mixer, and packed down to the required height.. This layer is usually cure for 24 hours.
The second layer is then mixed with the same binder and troweled above the first layer. The second layer takes about 48 hours to cure.
With Proper Installation, a poured in place rubber will last for more than a decade. If there are holes appear in their systems they should be patched as soon as possible otherwise they only going to get bigger.