For sheets up to 1 8 in.
How to seam copper sheets.
The backhand method is preferred for thicknesses of 1 4 in.
The weld should be started again and continued until the seam weld is completed.
This video describes how to make a double lock standing seam with a seaming anvil and a hammer.
Tin edges and cleats to be soldered form seams and solder.
When welding thin sheets the forehand welding method is preferred.
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Where lapped or bayonet type expansion provisions in work cannot be used or would not be sufficiently water weatherproof form expansion joints of intermeshing hooked flanges not less than 1.
3 2 mm thick a plain butt joint with squared edges is preferred.
6 4 mm or more.
It is arguably the most time proven type of roof panel seam.