This European Standard specifies a method for determining the resistance to peeling of joints between two adjacent sheets of the same plastic or rubber sheets for waterproofing. This test method is used mainly for testing the joints in mechanically fastened plastic or rubber sheets for waterproofing. The peel strength characterises the optimum joint strength which can be reached for a membrane and a joint technique under laboratory conditions. On roofs the joint strength could be clearly reduced due to the nonoptimal conditions (for instance pressure, temperature, humidity, pollution, workmanship). The requirement for the joint technique at the site shall ensure a permanently tight joint.