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Here is a series of photos showing the details of the copper flat-lock roof panel system, also known as flat seam copper roofing. Panels typically measure 18" x 24" nominal size. One long side and one short side are bent upward approximately 160 degrees to form a 3/4" fold. The remaining two sides are bent in the same manner, but are folded downward instead of upward. The choice of which short side to bend up depends upon the direction (left to right, or right to left) in which the panels are to be installed.
Eaves and rakes are fitted with custom fabricated style "T" drip edge, onto which the panels are crimped. Valley installation is performed with a V-shaped valley pan (or W-shaped if you prefer), usually 18" wide, with 3/4" folded edges, similar to the panels. All components are fastened in place by the use of clips that have an extra tab, which is folded over the heads of the copper nails used to attach them.
As installation progresses, the panels are hammered down flat, first with a rubber mallet, and then with a dead-blow hammer. This allows the seams to lay as flat as possible. All seams are then soldered with a propane-fired soldering tool.
Walls are flashed in a manner similar to that utilized with copper standing seam roofing. A custom copper wall flashing is fabricated and attached to the top or side row of the flat seam roof panels, and also attached to the wall. In the case of a masonry wall, such as brick, stone, or concrete, counter flashing is also fabricated and installed. To do this, a groove is cut into the masonry wall, that groove is then filled with a high-quality sealant, the flashing is inserted, and a final bead of sealant is applied. We prefer polyurethane sealant, but if you are comfortable with another product, we would certainly use that for you instead.
We perform both the manufacturing and installation phases of the soldered copper flat lock roof panel system (and everything else listed on this web site), but we can also do only the fabrication phase, if you desire. Either way, please send us pictures, drawings, measurements, and any other specifications you may have, and we would be happy to quote your project!