This video describes how to make a double lock standing seam with a seaming anvil and a hammer.
How to seam copper sheets.
Fabricate nonmoving seams in copper sheet with flat lock seams.
It is arguably the most time proven type of roof panel seam.
The backhand method is preferred for thicknesses of 1 4 in.
Expansion and contraction are a function of temperature change material properties and the dimensions of the material.
Tin edges and cleats to be soldered form seams and solder.
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.
The weld should be started again and continued until the seam weld is completed.
6 4 mm or more.