Requirement is something that is required in advance; "Latin was a prerequisite for admission".

Recording thermometer refers to one of several kinds of thermometer (liquid, metal, etc.) whose readings are recorded by a pen on a clockwork-driven drum carrying a ribbon of graduated paper.

Roof refers to a protective covering that covers or forms the top of a building.

Roof flashing can refer to the weatherproofing shielding put around objects which protrude from the the protective covering that covers or forms the top of a building (such as pipes and chimneys, or the edges of other roofs) to deflect water away from the seams.

Rubber refers to a material that is capable of recovering from large deformations quickly and forcibly, and can be, or already is, modified to a state in which it is essentially insoluble (but can swell) in a boiling solvent such as benzene, methyl ethyl ketone or ethanol toluene azeotrope.

The term roofer (also roof mechanic, roof carpenter) refers to a construction worker who specializes in the construction and maintenance of the roof of a structure. Roofers may be classified into four different types, depending on their specialty.

Recycling makes reference to the process of collecting, sorting, cleansing, treating and reconstituting materials that would otherwise become waste, and returning them to the economic stream as raw materials for new, reused or reconstituted products.

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