Search Results for V valley The place where two planes of a roof meet at a downward, or V, angle. vapor barrier Material used to prevent the passage of vapor or moisture into a structure or another material, thus preventing condensation within them. variable air volume (VAV) An air distribution system capable of automatically delivering a reduced volume of constant temperature cool air to satisfy the reduced cooling load of individual zones. veneer A masonry facing attached to the backup, but not so bonded as to act with it under load vent system Piping that provides a flow of air to or from a drainage system to protect trap seals from siphonage or back pressure. veranda A covered porch or balcony along the outside of a building, intended for leisure. vermiculite A group name for certain clay minerals, hydrous silicates or aluminum, magnesium, and iron that have been expanded by heat. Vermiculite is used for lightweight aggregate in concrete and as a loose fill for thermal insulating applications. vestibule An anteroom or foyer leading to a larger space. vibrated concrete Concrete compacted by vibration during and after placing. vibration Energetic agitation of freshly mixed concrete during placement by mechanical devices, either pneumatic or electric, that create vibratory impulses of moderately high frequency that assist in evenly distributing and consolidating the concrete in the formwork. vibration isolator A flexible support for any form of vibrating or reverberating machinery, piping, or ductwork, serving to reduce the remainder of the building structure. vinyl tile A floor tile similar to vinyl-asbestos floor tile, but which does not contain mineral or other fibers. visual inspection An inspection made without the use of instruments. vitrified-clay pipe Glazed earthenware pipe favored for use in sewage and drainage systems because it is impervious to water and resistant to chemical corrosion. void ratio In a mass of granular material, the ratio of the volume of voids to the volume of solid particles. volume damper Device installed in a duct system circuit to add resistance to the circuit for air volume balancing. Search Again