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Traditional batten seam roofing
For traditional batten seam roofing of copper, terne, stainless or zinc, determine the location of the clamps on the seam before closing the seams. At clamp locations use a hand seamer to hold the seam open to a single fold as shown. If desired, following clamp installation, the seam can be dressed to the clamp.

If the system is being retrofitted to an existing roof of this type, use a de-seaming tool to open the seam to a horizontal, single fold at clamp locations.