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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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TOP OF THE TOWN Installation of cast iron ventilation grille and lead slate and sleeve at Cowane's Hospital, 49 St John Street FK8 1ED for patrons of Cowane's Hospital Trust.
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.