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Undercoat to Wood Rays

By The Old House Web

 

Undercoat. A coating applied prior to the finishing or top coats of a paint job. It may be the first of two or the second of three coats. In some usage of the word, it may become synonymous with priming coat.

 

Under layment. A material placed under finish coverings, such as flooring, or shingles, to provide a smooth, even surface for applying the finish.

 

Valley. The internal angle formed by the junction of two sloping sides of a roof.

 

Vapor barrier. Material used to retard the movement of water vapor into walls and prevent condensation in them. Usually considered as having a perm value of less than 1.0. Applied separately over the warm side of exposed walls or as a part of batt or blanket insulation.

 

Varnish. A thickened preparation of drying oil or drying oil and resin suitable for spreading on surfaces to form continuous, transparent coatings, or for mixing with pigments to make enamels.

 

Vehicle. The liquid portion of a finishing material; it consists of the binder (nonvolatile) and volatile thinners.

 

Veneer. Thin sheets of wood made by rotary cutting or slicing of a log.

 

Vent. A pipe or duct which allows flow of air as an inlet or outlet.

 

Vermiculite. A mineral closely related to mica, with the faculty of expanding on heating to form lightweight material with insulation quality. Used as bulk insulation and also as aggregate in insulating and acoustical plaster and in insulating concrete floors.

 

Volatile thinner. A liquid that evaporates readily and is used to thin or reduce the consistency of finishes without altering the relative volumes of pigments and nonvolatile vehicles.

 

Wane. Bark, or lack of wood from any cause, on edge or corner of a piece of wood.

 

Water.repellent preservative. A liquid designed to penetrate into wood and impart water repellency and a moderate preservative protection. It is used for mill. work, such as sash and frames, and is usually applied by dipping.

 

Weatherstrip. Narrow or jamb-width sections of thin metal or other material to prevent infiltration of air and moisture around windows and doors. Compression weather stripping prevents air infiltration, provides tension, and acts as a counter balance.

 

Wood rays. 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 to transport it horizontally in the tree.



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