9 Engineered Wood Fiber (EWF) Hybrid Surface Systems (HYB) DESCRIPTION ASTM defi nes EWF as processed wood ground to a fi brous consistency, randomly sized, approximately 10 Ɵ mes longer than wide with a maximum length of 2 inches. Free of hazardous substances. Not to be confused with wood chips. DESCRIPTION MulƟ -layer system where the base layer may consist of either contained or loose parƟ cles like shredded rubber or carpet pad. The top layers may be outdoor carpeƟ ng, arƟ fi cial turf, or rubber top mat. COST (Average market cost 2009-2012)(MATERIAL ONLY) $ 0.74 to $2.50/sq Ō COST (Average market cost 2009-2012)(MATERIAL ONLY) $7.50 to $12.65/sq Ō INSTALLATION Can be installed by contractor or park/facility personnel. INSTALLATION Installer must be specially trained/cerƟ fi ed by the manufacturer. REPAIRS Repairs may be completed by contractor or park/facility personnel. REPAIRS Usually repairs must be conducted by the installer. In some cases, park/facility personnel may be trained to make smaller repairs. COMMON ACCESSIBILITY ISSUES Improper installaƟ on and/or maintenance can result in undulaƟ on across the horizon of the surface aff ecƟ ng running slope, cross slope and change in level. Product material should be installed in layers and compacted in order to achieve an accessible route and level clear ground space at equipment. Surface material is likely to displace at heavy use areas with moƟ on, such as at swings, slides, sliding poles, climbers, spinners and teeter toƩ ers. Displaced material should be raked level and compacted before addiƟ onal fi ll is added. COMMON ACCESSIBILITY ISSUES Seams may separate or detach from the border creaƟ ng changes in level and openings aff ecƟ ng the accessible route. ShiŌ ing of loose fi ll in the base layer may aff ect running and cross slopes. The arƟ fi cial turf top layer may experience build-up of staƟ c electricity requiring applicaƟ on of anƟ -staƟ c soluƟ on. Longitudinal Research Study
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