First, tiles direction, should be based on the roof slope to determine, on the roof slope is less than three percent, coils should be parallel to the roof tiles, in three percent to fifteen percent of the time, perpendicular to the ridge, when more than fifteen percent of the slope should be perpendicular to the roof of asphalt paving, the other based on the actual situation, consider parallel or perpendicular to the ridge.
Second, iron sheet in order, when the waterproof layer construction, should first make node, roof drainage is relatively concentrated parts processing, followed by the bottom upward construction, paving multi span and height span roof, should be in accordance with the high to low, far after the first in order of construction.
Methods the coiled material and width, tiles with overlapping method, the adjacent joints should be staggered, parallel to the ridge lap joint along the direction of flow, each layer of membrane laminated paved gutter and roofing, connected by cross lap joint, joint stay fit roof don't fit in gully bottom, avoid the short edge lap, must when used in the short side lap to prevent roll down measures.