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| Raw water
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Water supplied to the plant before any treatment. |
| Rawhide
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Leather that is untanned. |
| Rayleigh frequency distribution
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A mathematical representation of the frequency or ratio that specific wind speeds occur within a specified time interval. |
| Rays, wood
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Strips of cells extending radially within a tree and varying in height from a few cells in some species to 4 inches or more in oak. The rays serve primarily to store food and transport it horizontally in the tree. On Quartersawn oak flooring, the rays form a conspicuous figure, sometimes referred to as Flecks. |
| Raze
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To demolish. |
| Re-cover (overlay)
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The installation of a new roof system over an existing system without removing an existing system. |
| Re-impregnate
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To replace oils and bitumen in the components of the BURM which through weathering and oxidation, have been lost. |
| Re-roofing
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The procedure of installing a new roof system. |
| Reactance
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A counter voltage occurring in AC circuits causing power loss. |
| Reaction flux
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A paste used in soldering that reacts chemically with the metal being soldered when heat is applied. |
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