String and trimmer concrete stair

• Another construction is to form a RC frame of beams to landings supporting inclined beams to flights . 
• Landing beams are supported by side walls or the beams of a frame and in turn support inclined beams that support the steps . 
• This is a form of construction with a very untidy soffit or underside to the stair . 
• It is best suited to the use of precast concrete steps that bear on the inclined beam under the flight with step ends built into enclosing walls or on two inclined beams , and the use of precast landings .