A concrete-filled stair riser is supported by a steel channel stringer with a multi-rail guardrail system. The guardrail incorporates a 1-1/2 inch diameter painted steel handrail mounted 34 to 38 inches above the tread nosing, alongside 3/4 inch diameter painted steel rods and 5/8 by 2 inch painted steel flat bars. The top of the guardrail sits at 42 inches above the stair nosing, maintaining a maximum 4 inch spacing between vertical elements. Risers are detailed with a 4 inch minimum to 7 inch maximum height.
EQ EQ EQ EQ EQ EQ EQ EQ EQ EQ 34" MIN. - 38" MAX. NOSING TO TOP OF HANDRAIL 42" NOSING TO TOP OF GUARDRAIL 4" MAX. 5/8" X 2" PAINTED STEEL FLATBAR 3/4" Ø PAINTED STEEL RODS 1 1/2" Ø PAINTED STEEL HANDRAIL RISER 4" MIN. - 7" MAX. CONCRETE FILL STEEL CHANNEL STRINGER PAINTED STEEL RISER, TYP. 12" MIN. PER 2016 CBC SECTION 1014 1. HANDRAILS SHALL BE PROVIDED ON BOTH SIDES OF STAIR. 2. CIRCULAR HANDRAILS TO HAVE A 1-1/4" MIN. TO 2" MAX. DIAMETER. NON- CIRCULAR CROSS SECTIONS SHALL HAVE A PERIMETER DIMENSION OF 4" MIN. TO 6-1/4" MAX. AND A CROSS SECTION DIMENSION OF 2-1/4" MAX. 3. HANDRAIL GRIPPING SURFACES SHALL BE CONTINUOUS WITHOUT INTERRUPTION BY NEWEL POSTS OR OTHER OBSTRUCTIONS 4. THE HANDRAILS WILL NOT ROTATE IN THEIR FITTINGS 5. HANDRAILS ARE TO BE MOUNTED 34" TO 38" ABOVE NOSING TREADS 6. HANDRAIL TO EXTEND AT LEAST 12" BEYOND THE TOP RISER AND 12" PLUS THE TREAD DEPTH BEYOND THE BOTTOM NOSING 7. THE ORIENTATION OF AT LEAST ONE HANDRAIL EXTENSION AT THE BOTTOM OR TOP LANDING SHALL BE IN THE DIRECTION OF THE RUN OF THE STAIR, PERPENDICULAR TO THE DIRECTION OF THE STAIR NOSING, AND SHALL NOT REDUCE THE MIN. REQUIRED WIDTH OF STAIR 8. ENDS OF HANDRAILS TO RETURN TO WALL OR TERMINATE IN NEWEL POSTS OR SAFETY TERMINALS AS SHOWN IN PLANS AND ELEVATIONS/SECTIONS
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