Our typical playground uses use Engineered Wood Fiber (EWF) surfacing. EWF is a processed wood (approx. 2" length max.), ground to a fibrous consistency, free of hazardous elements, and approved by the International Play Equipment Manufacturers Association (IPEMA). It is engineered specifically for playgrounds and free of twig and leaf material. However, each site will be evaluated to determine the best surface. Site conditions or programmatic needs may make poured in place a preferred surface. For example, a site that is in the flood plain may be a good candidate for PIP.