The pilot was asked to reposition the helicopter on the helideck to make room for a helicopter that was coming in to land. He performed a walk around inspection of the area, and was aware of the location and height of the helideck safety skirting. During the repositioning landing, the pilot felt a high frequency vibration and the helicopter began to shudder. After the accident, a piece of tail rotor skin was found lodged in the skirting. The tailrotor had impacted the skirting. Substantial damage occurred to the helicopter's tailboom. The pilot reported that there were no mechanical malfunctions with the helicopter in reference to the accident flight.