12.6. Diagonal Flat Lock Systems

Description: Diagonal flat lock panels are usually constructed of relatively small, 8 to 12 inch, square copper pieces. They are very often used on curved surfaces, such as domes, spires and vaults.

There are two slightly different patterns of panels. Their differences are presented below. All panels can be attached to the substrate with cleats or they can be nailed at their upper vertex with a single copper, brass, bronze, or stainless steel nail.

Corner and base conditions use transition and termination strips, respectively.

The minimum recommended thickness for these panels is 16 ounce copper.

The number of cleats per panel is determined by panel size.

Substrate: Continuous nailable substrate.

Fastening Method: Cleats or nails.

12.6A. Flat Seam - Diagonal Lock

The corners of the square panels are trimmed as shown. Notice the corners on the right and left are cut deeper than the top and bottom. This small difference results in the joints aligning as shown in the elevation. Sections 1 and 2 show that copper flashing is used at transitions, such as corners and base conditions.

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12.6B. Flat Seam - Diagonal Lock - Alternate

These panels are trimmed equally at all four corners. The result is joints that are offset, as shown in the elevation. Sections 1 and 2 from Detail A, also apply to this panel pattern.

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