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When laying out a roof in preparation for slating it, chalk lines across the entire roof area marking the top edge of every row of slate. No aluminum drip edges (as are commonly used on asphalt shingle roofs) are needed on slate roofs. When measuring for the starter slate and the first row, allow for the slate to hang beyond the drip edge of the fascia (or trim moulding) one and a half inches. The starter slates are usually made of the same size slates as those on the main roof, turned sideways and upside down (back facing out), and usually 1/4 of the length of the first one is trimmed off to allow the joints to be properly staggered in relation to the overlapping row. |
