lead slate

lead slate, copper slate, lead sleeve

A cylindrical sleeve, formed of sheet lead or sheet copper, used around a pipe where it penetrates a roof to make the intersection watertight.
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Underneath the tarpaulin, a team of 10 roofers, 10 carpenters, four stone masons, four specialist lead slate workers and four labours, have worked on the restoration project.
The raiders wrecked the Kilwinning Masonic Lodge in Dalkeith, Midlothian, while ripping away lead slates.