Tin edges and cleats to be soldered form seams and solder.
How to seam copper sheets.
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.
It is arguably the most time proven type of roof panel seam.
3 2 mm thick a plain butt joint with squared edges is preferred.
This type of seam is used wherever significant movement of the copper sheets is expected.
When welding thin sheets the forehand welding method is preferred.
For sheets up to 1 8 in.
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The backhand method is preferred for thicknesses of 1 4 in.
6 4 mm or more.
Fabricate nonmoving seams in copper sheet with flat lock seams.