Slate is a fine-grained metamorphic rock that splits along parallel planes into thin, durable sheets, a property called cleavage that has made it architecture's classic roofing material for centuries, alongside use as flooring, cladding and writing surfaces. Its low water absorption and resistance to frost damage give a well-laid slate roof a service life measured in generations rather than decades, and its natural gray, green, purple or black coloring, depending on mineral content and quarry origin, needs no applied finish. Wales, Vermont and Pennsylvania have historically been major slate-producing regions supplying roofing across Britain and the northeastern United States.
Slate
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Source 31 and 33 Dee Banks, Chester (Wikipedia)
Source Allan Bank (Wikipedia)
Source Baston Lodge (Wikipedia)
Source Escrick Park (Wikipedia)
Source Eshton Hall (Wikipedia)
Source Jan Pier House (Wikipedia)
Source Oak Alley Plantation - Wikipedia
Source Plas Wilmot (Wikipedia)
Source Royal Courts of Justice - Wikipedia
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Wikipedia
Wikimedia FoundationWikipedia: Slate, introductory paragraph, https://en.wikipedia.org/wiki/Slate
Slate is a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade, regional metamorphism.
Wikipedia: Slate, Construction section, on roofing suitability
Slate is particularly suitable as a roofing material as it has an extremely low water absorption index of less than 0.4%, making the material resistant to frost damage.
View the Source Royal Courts of Justice - Wikipedia
Seen In: Royal Courts of Justice, infobox material field: Portland stone ashlar and red bricks with granite, marble and red sandstone dressings and slate and lead roofingView the Source Escrick Park (Wikipedia)
Seen In: Escrick Park, IntroductionQuote, Seen In: Escrick Park, Introduction
It is built of brick with stone dressings, rendered on the front, and with a Welsh slate roof.
Eshton Hall (Wikipedia)
Seen In: Eshton Hall, IntroductionQuote, Seen In: Eshton Hall, Introduction
The hall is built of stone with slate roofs.
Plas Wilmot (Wikipedia)
Seen In: Plas Wilmot, Wikipedia leadQuote, Seen In: Plas Wilmot, Wikipedia lead
The house was originally constructed c.1829 of red brick with slate roof, with additions in the late 19th and early 20th centuries.
Baston Lodge (Wikipedia)
Seen In: Baston Lodge, Wikipedia leadQuote, Seen In: Baston Lodge, Wikipedia lead
The architecture is in the Italianate style, with coursed stone, chamfered quoins, and plain stone architraves and bands.
Jan Pier House (Wikipedia)
Seen In: Jan Pier House, Wikipedia leadQuote, Seen In: Jan Pier House, Wikipedia lead
It is a one- to two story, asymmetrical stone building built into a hillside.
Oak Alley Plantation - Wikipedia
Seen In: Oak Alley Plantation, Wikipedia articleQuote, Seen In: Oak Alley Plantation, Wikipedia article
The roof is made of slate and originally had four dormers, one on each side of the hipped roof.
Allan Bank (Wikipedia)
Seen In: Allan Bank, Wikipedia articleQuote, Seen In: Allan Bank, Wikipedia article
Allan Bank is designed in a "bleakly Italianate" style according to Pevsner, faced with scored stucco and roofed with slate; it has been described as "large, though not handsome".
31 and 33 Dee Banks, Chester (Wikipedia)
Seen In: 31 and 33 Dee Banks, Chester, Wikipedia articleQuote, Seen In: 31 and 33 Dee Banks, Chester, Wikipedia article
It is constructed in brown brick with diapering in blue brick and some stone dressings; the roof is of grey-green slate.
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