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How to solder copper roofing.
Check the slate roof warehouse for tools materials and supplies.
The solder should be 50 50 tin lead solder in either 1 pound or 1 4 pound bars.
This is the one of the most comprehensive resources available on metal roofing.
Solder much prefers bright copper with a very close fit.
Assuming the copper is relatively clean and bright first brush or squirt on the liquid flux hold the hot soldering iron on top of and against the seam then add additional solder when the metal gets hot enough to melt it until the joint is filled.
Generally ruby fluid works fine for new copper soldering but if you are having issues try a flux specifically made for copper.
Dipping a heated copper soldering tip while in use into a 1 2 mix of water and 1 2 ruby fluid is a good way to remove any debris from the tip which causes dirty joints.
Picture taken out copper and common sense by revere.
It may help to pre tin the sheet edges to facilitate soldering.
Install only as much copper as can be soldered by the end of the day.
Make your seams tight clean clean and tight seams are essential.
When soldering copper 50 50 lead tin solder is preferable and a multitude of fluxes are available.