Gmax values increase with high usage, compaction, and infill segregation. These values can be reduced by grooming or top dressing your field. For optimum synthetic turf playing field performance, fields should have Gmax results between 120 and 145. It’s best to have your field tested once a year.
For synthetic surfaces, ASTM specifies that the reported Gmax value for all test points on a field should be less than 200 Gmax (as measured in accordance with ASTM procedures F355-A and F1936). If the standard isn’t met, the field is considered unsafe and remediation is required.
Gmax measurements change as the field ages. This suggests that regular Gmax testing is important - but how often is often enough? Among researchers and other industry experts, there is a general consensus that an annual test is most desirable.
Sports Turf Care, LLC offers several levels of services that will improve the performance of the Gmax test. Most importantly is to consider implementing periodic INFILL DECOMPACTION AND ADVANCED LEVEL SURFACE GROOMING followed by a scheduled grooming program that delivers on-going prevention of field hardening.