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 Claridge's (Wikipedia)
Source Cordts Mansion (Wikipedia)
Source Dundas Castle (Roscoe, New York) (Wikipedia)
Source DuPont-Guest Estate (Wikipedia)
Source Escrick Park (Wikipedia)
Source Eshton Hall (Wikipedia)
Source Haus Carstanjen (Wikipedia)
Source Jan Pier House (Wikipedia)
Source Kenwood House (Wikipedia)
Source Oak Alley Plantation - Wikipedia
Source Plas Wilmot (Wikipedia)
Source Royal Courts of Justice - Wikipedia
Sources
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 DuPont-Guest Estate (Wikipedia)
Seen In: DuPont-Guest Estate, Article bodyQuote, Seen In: DuPont-Guest Estate, Article body
and a gabled, slate roof
Dundas Castle (Roscoe, New York) (Wikipedia)
Seen In: Dundas Castle (Roscoe, New York), Article textQuote, Seen In: Dundas Castle (Roscoe, New York), Article text
Dundas imported slate roofing from England, iron gates from France, and marble from Italy for floors, fireplaces, and staircases.
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.
Kenwood House (Wikipedia)
Seen In: Kenwood House, Article textQuote, Seen In: Kenwood House, Article text
This included repairing the Westmorland slate roof, redisplaying the Iveagh Bequest paintings in the south of the house, and redecorating the structure to closer resemble Adam's original design.
Haus Carstanjen (Wikipedia)
Seen In: Haus Carstanjen, Article textQuote, Seen In: Haus Carstanjen, Article text
The original castle consists of an angular, Neo-Gothic three-story building, with two circular turrets, roofed conically in grey slate, mullioned windows, and colonnaded galleries.
Cordts Mansion (Wikipedia)
Seen In: Cordts Mansion, LeadQuote, Seen In: Cordts Mansion, Lead
It features a centered tower, slate sloping concave mansard roof with headed dormer windows, iron roof cresting, a columned front porch verandah, and a bay window.
Claridge's (Wikipedia)
Wikimedia FoundationSeen In: Claridge's, Infobox: materialQuote, Seen In: Claridge's, Infobox: material
Red brick with red Mansfield stone, slate roofs and cast iron balconies
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