A temporary protection for an opening in a frame of a building component includes flexible sheet material spanning the opening between opposite sides thereof. Each end portion of the sheet material is connected to a frame member at a respective side of the opening, the flexible sheet material being of an open structure and the connection with the frame member being by adhesive which permeates the material from one side to the other. The connection of the sheet material to the frame members is such as to resist loading applied by an adult person acting against the sheet material. The sheet material can be cut by a sharp blade for subsequent removal of the temporary protection from the opening when no longer required.