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roofing slate

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roofing slate [′rüf·iŋ ‚slāt]
(materials)
Hard varieties of slate varying in size from 12 × 6 inches (30 × 15 centimeters) to 24 × 14 inches (60 × 35 centimeters), and from ⅛ to ¾ inch (3 to 19 millimeters) in thickness.

slate
A hard, brittle metamorphic rock consisting mainly of clay minerals, characterized by good cleavage along parallel planes; used extensively as dimension stone in thin sheets for flooring, roofing, panels (both decorative and electrical), and chalkboard, and in granular form as surfacing on composition roofing.


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All roofing slates, structural timber and floor boards are also saved for future use.
4) Ronnie Grayburt of Leading Way Construction cuts roofing slate for repairs on the fire station.
Dinorwig Quarry was, at its peak, the second largest producer of slate in North Wales next to Penrhyn Quarry, and could produce almost 90,000 tons of roofing slate every year.
 
 
 
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