An astragal is molding profile composed of a half round surface surrounded by two flat plains (fillets). An astragal is sometimes referred to as a miniature torus.
Ridge Tile A specially shaped angular or half round tile for covering and making weather-tight the ridge of a roof.
Riser The vertical part of a step or stair.
Rising Damp Moisture soaking up a wall from the ground by capillary action.
Round top A generic term referring to any of a variety of window units with one or more curved frame members, often used over another window or door opening. Also known as Round Top or Half Round.
Half round tiles are still in use laid alternatively face up and face down and are referred to as "Spanish tiles", "over and unders" or less reverantly, "monks and nuns", they are suitable for low pitches but are not easily cut.
 See also: System, Profile, Member, Brick, Moulding
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