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How to make the first sheet lie flat, without overlapping, to get a flat cornice and gable overhangs, watch the video. ============================= 1, the rafters should be level 2. Sheathing, the distance from the rafters should be the same at the top and bottom, that is, the cornice overhang on the gable. 3. Measure the diagonal on the slope, 4 Lay the first sheet and pull the cord along the cornice.