R Architectural Abbreviation

Riser

When referring to drywall, this means to install drywall to the walls and ceilings (with nails and screws), and before taping is performed. Each of the vertical boards closing the spaces between the treads of stairways. Vertical board rising from the back of one tread of a staircase to the front of the next. Reservoir of molten metal from which casting feeds as it shrinks during solidification. A riser is a power line pole that connects an overhead system to an underground system.