Page 30 - directory final 2014/2015

Air Conditioning Contractors

APRROACH - The area between the sidewalk and the street that leads to a driveway or the transition from the street as you 29
approach a driveway.
ARCHITECT - A tradesman who designs and produces plans for buildings, often overseeing the building process.
ARCHITECTS RULE (ruler) - Three sided ruler with different scales on each side. Also referred to as a “scale.”
ASPHALT - A dark brown to black, highly viscous, hydrocarbon produced from the residue left after the distillation of petro-
leum. Asphalt is used on roofs and highways as a waterproofing agent.
AUGER – In carpentry, a wood-boring tool used by a carpenter to bore holes
B
BACKER ROD – In glazing, a polyethylene or polyurethane foam material installed under compression and used to control
sealant joint depth, provide a surface for sealant tooling, serve as a bond breaker to prevent three-sided adhesion, and provide
an hour-glass contour of the finished bead.
BACKFILL – (1) filling in any previously excavated area. (2) in carpentry, the process of fastening together two pieces of
board by gluing blocks of wood in the interior angle.
BACKFLOW- The flow of liquids through irrigation into the pipes of a potable or drinking water supply from any source
which is opposite to the intended direction of flow.
BACKFLOW PREVENTER - A device or means to prevent backflow into the potable water supply.
BACKHOE - Self powered excavation equipment that digs by pulling a boom mounted bucket towards itself. It is used to dig
basements and/or footings and to install drainage or sewer systems.

See page 52

Product & Material Suppliers Chamber of Construction Industry Sri Lanka