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0033 Slate Nailing Details for Slates 20 inches or Less in Length - Roofing - Slate
 
0033 Slate Nailing Details for Slates 20 inches or Less in Length - Roofing - Slate -

Image Text: Note: slates longer than 20 inches usually have 4 nail holes > 2 nails per shingle > shingle length > 3 inch headlap > exposure = (length - 3 inches) / 2 > for example: on a 20 inch slate the exposure should be (20 - 3) / 2 or about 8.5 inches > joints in every other course can line up > not less than 3 inch offset and as near to the centerline of the above shingle as possible

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