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Roof flashing/plumber's lead is usually nearly 100% lead and is viewed by bullet casters as too soft to use alone as a bullet alloy. Lead roof flashings/lead pipes have not been used for some time now. Any solder joints would be likely to be tin-lead solder, but not enough tin to harden the large amount of lead in the flashings/pipes.
The threaded portion that had a higher melting point likely was lead/tin/antimony. In any event, if you melted it into the melt it is too late if it contained zinc anyway...the first bullets you try to cast with it will tell you if they contain zinc.
A note about lead roof flashings and other sources of "pure" lead, almost all sources of lead can be utilized for good bullets with the addition of some tin and can be heat treated (hardened) with the addition of anatomy and arsenic (in "chilled" lead shot).
If one has shooting friends who are more inclined to shoot muzzle loaders, often they are inclined to trade harder alloys for pure lead.
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