Raked Joint 
A joint made by removing the surface of mortar, while it is still soft, with a square edged tool; is difficult to make watertight; produces marked shadows and tends to darken the overall appearance of a wall. *
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Rebar
A steel bar having ribs to provide greater bonding strength when used as a reinforcing bar in reinforced concrete. *
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Refractory
A material, usually non-metallic used to withstand high temperatures. *
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Reinforced Brick Masonry
Grouted brick masonry in which reinforcement is provided in the horizontal joints and in grouted vertical joints between withes. *
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Rowlock Arch
An area wherein the bricks or small voussoirs in separate concentric rings. *
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Rowlock, Rolok, Rollock
1. A brick laid on its edge so that its end is visible.
2. One ring of a rowlock arch.
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Rubble
Rough stones of irregular shapes and sizes; used in rough, uncoursed work in the construction of walls, foundations and paving. *
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Rubble Stone
Rough stones of irregular shapes and sizes; used in rough, uncoursed work in the construction of walls, foundations and paving. *
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Running Bond, Stretcher Bond
A bond in which bricks or stones are laid lengthwise; all courses are laid as stretchers with the vertical joints of one course falling midway between those of adjacent courses. *
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