Revolving door - They provide entrance on one side and exit on the other simultaneously keeping the opening automatically closed when not in use. The door is so assembled as to exclude the wind draught.
Riser - The vertical portion of a step providing support to the tread.
Rise of steps - It is the vertical distance between the upper surface of the successive treads.
Rolling steel shutter doors - These doors are commonly used for show windows , stores , shop fronts and godowns etc. The door shutter acts like a steel curtain and provides adequate protection and safety against burglars and fire.
Roof - A roof may be defined as a covering provided over the top of a building with a view to keep out rain , snow and wind and to protect the building from the adverse effects of these elements.
Rough cast finishing - It is a finish in which the mortar for the final coat contains a proportion of fairly big size coarse aggregates.
Rough tooled surface - In this type of surface finish , the projection of the stone block are removed by means of chisels and the surface is nearly dressed true. The corners and the edges are made accurate , chisel-draughted margins sunk and the side and bed joints roughly treated to ensure proper bonding.
Template - Block of stone or concrete of designed dimensions used under a beam or girder to distribute the concentrated load at the end of the beam or girder over a greater area of bearing surface.
Textured finish - In this finish , ornamental patterns or textured surfaces are produced by working with various tools on the freshly applied final coat.
Through stone - A stone passing through a wall from front to back face and acting as a binder for the two faces of the wall is termed as through stone.