A connecting means for connecting two corrugated sheets firmly to each other is made of a thin metal sheet folded into two portions one portion is shorter than the other portion and is parallel to one part of the second portion, forming a gap between the folded portions that fits the thickness of the corrugated sheets. A threaded hole is made in the other part of the second portion of the connecting means adapted to accept a fastening screw. The connecting means may be placed over an edge of one corrugated sheet, another corrugated sheet is placed over the one corrugated sheet and a fastening screw is inserted through concentric holes made in the two corrugated sheets and is firmly fastened in the threaded hole.