Topping

topping

Angling part of a brightly-coloured feather, usually from a golden pheasant crest, used to top some artificial flies

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topping [′täp·iŋ]

(chemical engineering)

The distillation of crude petroleum to remove the light fractions only; the unrefined distillate is called tops.

(civil engineering)

A layer of mortar placed over concrete to form a finishing surface on a floor, driveway, sidewalk, or curb.

(textiles)

A step in the dyeing process in which a dyed material is placed in a bath of another color.

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topping

1. A layer of high-quality concrete or mortar placed to form a floor surface on a concrete base.

2. The mixture of marble chips and matrix which, when properly processed, produces a terrazzo surface.

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Topping 

a method of plant care that consists of removing the blossoms when they begin to bloom in order to achieve better leaf growth (for example, in tobacco growing).

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Topping 

a thin, strong layer used in multilayer structures in buildings to accept and transmit loads bearing on an underlying layer of thermal or acoustical insulation; occupants, stored material, and equipment bearing on roofs or floors are typical loads to be transmitted in this manner. When underlying layers are insufficiently rigid, topping is used to construct an even surface that facilitates installation of overlying layers, such as waterproof roof coverings or flooring. Topping may be either monolithic (sandcement mix, asphalt concrete, or similar composition) or prefabricated, in the form of thin (4–5 cm thick) slabs of gypsum cement or lightweight aggregate concrete.