Book or website on lead roofing?

Can anyone point me at one?
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There is a section on how to make them in the City & Guilds plumbing book, which my local library used to carry. There is also a display about lead and how it is used in building at the Weald and Downland Open Air Museum northish of Chichester in West Sussex.
Colin Bignell
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http://www.leadsheetassociation.org.uk /
Lots of info on the site.
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From there...
"Lead is the most recycled and recovered building material in use today"
That fits so nicely with the thread about stripping lead from roofs!
--
Skipweasel
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Guy King wrote:

Much roofing lead is primary lead, not recycled. To make ductile sheet it's important that the alloy is pure and low in antimony. Scrap lead, unless it's clean roofing or gaspipe, is full of antimony that was either added as a hardening agent, or was just ignored in cast "ballast" lead. Given the relatively low cost of lead these days it's cheaper to use primary lead than to refine the scrap well enough for sheet grade.
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