Gable - It is the triangular portion of the end wall of a sloped roof formed by continuing the end wall up within the roof. Thus , the gable has two slopes with ridge in between.

Gallery - An intermediate floor or platform projecting from a wall of an auditorium or a hall providing extra floor area , additional seating , accomodation etc.

Garage - A building or portion thereof used for shelter , storage or parking of a wheeled vehicle.

Ground floor - Means the storey of the building which has its floor surface nearest to the ground around the building.

Garden wall bound - This type of bond is suitably adopted for one brick thick wall which may act as a garden wall or a boundary wall.

Gate valve - This type of valve is used to control flow of water or for completely stopping the flow of water in a pipe line.

Gauged brick arches - Gaiged bricks are those which have been accurately prepared to a wedge shape for the arch construction.

Geometrical stair - This is similar to the open-newel stair with the difference that the open well between the forward and the backward flight is curved.

Glass partitions - These are the partitions which are made either from the sheet glass or hollow glass blocks.

Glazing - Glazing consists in securing glass , in prepared opening in iron , steel , masonry or wood work.

Globe valve - This is the most commonly used type of valve for manually controlling or completely closing the flow of water in domestic water installation.

Going of step - The run of a step in a stair or the width of the tread between the direction of a stair.

Goose neck - This is 40 to 50 cm long flexible curved pipe made up of brass , copper or lead inserted between the ferrule and the service pipe.

Grease trap - These traps are especially designed for removing the grease content of waste water before discharging the same into the drain.

Grillage foundation - When heavy structural loads from columns , piers or stanchions are required to be transferred to a soil of low bearing capacity , grillage foundation is often found to be lighter and more economical.

Gully trap - Gully trap is a deep seal trap which is provided on the external face of the wall for disconnecting the waste water flowing from kitchen , bath , wash basin & floors from the main drainage system.

Guniting - This is a method to prevent the defect of dampness in the structure. This consists in depositing an impervious layer of rich cement mortar over the surface to be water proofed.