Building Construction
The type of pointing in which upper side of mortar joints is kept about 12 mm inside the face of the masonry and bottom is kept flushed with face of wall, is

Truck pointing
Recessed pointing
Struck pointing
Grooved pointing

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Building Construction
Slate

Is a metamorphic rock
Possesses good water absorption capacity
Splits into thin sheets along its bedding planes
Has a smooth surface and contains alumina and silica

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