Full Description ADOPTED_FROM:CEN/TS 14416:2014 This Technical Specification describes a laboratory procedure for the rapid testing of the resistance of polymeric, bituminous or clay geosynthetic barriers to root penetration. It is suitable for testing of welded seams or other areas of potential weakness. A longer test that may be more suitable for testing the long-term resistance of geosynthetic barriers is described in EN 13948.