Roofing materials suitable for roof greening have been studied, such as coating systems and sheet systems. When root resistance of the waterproof layer is not sufficient, plant roots breaks through the waterproof layer, which may lead to leakage. Especially directly on the waterproof layer, when planting laying soil. The purpose of this study is to clarify the roof resistance of FRP waterproof. In a way the same test method of JASS8T-401-2014, which was the bamboo plant, through the roots in the FRP waterproof was not confirmed. In JSTM G7101 method, the # 450 glass mat one or more thickness was confirmed to be at least 50 N.
