Trellising on the front wall or roof

2163. The front or roof trellis generally extends under the whole of the roof, at a moderate distance from it, according to circumstances. It is generally formed of wires stretched horizontally at 6 or 8 inches' distance, and retained in their places by being passed through wrought-iron trellis-rods proceeding from the parapet to the back wall, or the lower edges of the rafters, when formed in a manner adapted for this end.