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-, I I . �� TREADS & RISERS: TNE NEIGHT OF RISERS SHALL NOT EXCEED 7 3/4 INCNES, AND TREAD (EXCLUSIVE OF NOSING) SHALL BE NO LESS THAN f 0 /NCHES WIDE. TREADS WITH A NOSING ARE ALLOWED A MAX. PROJECTION OF 1 /NCH OVER THE LEVEL IMMEDIATELY BELOW TNAT TREAD. OPEN RISERS ARE PERMITTED, PROVIDED THAT THE OPENING BE7WEEN TREADS DOES NOT PERMIT TNE PASSAGE OF A 4-INCN DIAMETER SPNERE. NANDRAILS: R311.7.7 HANDRAILS - NANDRAILS SHALL BE PROVIDED ON AT LEAST ONE SIDE OF EACH CONTINUOUS RUN OF TREADS OR FLIGNT WITN FOUR OR MORE RISERS. R311.7.7.1 HEIGHT - HANDRAIL HEIGNT, MEASURED VERTICALLY FROM SLOPED PLANE ADJOINING THE TREAD NOSING, OR FlNISH SURFACE OF TNE R,4MP SLOPE, SHALL BE NOT LESS THAN 34 /NCNES AND NOT MORE THAN 38 INCHES. R311.7.7.2 CONTlNUITY - HANDR,4/LS FOR STAIRWAYS SHALL BE CONTINUOUS FOR THE FULL LENGTH OF THE FLIGHT, FROM A POINT DIRECTLY ABOVE THE TOP RISER OF THE FLIGHT TO A POINT DIRECTLY ABOVE THE LOWEST RISER OF THE FLIGHT. HAILR.4/LS ENOS SHALL BE RETURNED OR SHALL TERMlNATE /N NEWEL POSTS OR SAFETY TERMINALS. HANDRAILS ADJACENT TO A WALL SNALL HAVE A SPACE OF NOT LESS TNAN 1 1/2 INCH BETWEEN THE WALL AND THE HANDR.4/LS. R311.7.7.3 GRIP-SIZE - ALL REQUIRED HANDR,4/LS SHALL BE ONE OF TNE FOLLOWING TYPES OR PROVIDE EQUIVALENT GR,4SPABlLITY. 1) 7YPE l. HANDR,4/LS WITH CIRCULAR CROSS SECTION SHALL HAI/E AN OUTSIDE DIAMETER OF AT LEAST 1 1/4 /NCNES AND NOT GREATER THAN 2 /NCNES. lF THE HANDR,4/L lS NOT CIRCULAR, IT SNALL HAVE A PERIMETER DIMENSION OF AT LEAST 4 INCHES AND NOT GREATER TNAN 6 1/4 /NCHES WITH A MAXIMUM CROSS SECTION OF TNE DIMENSION OF 2 1/4 INCNES. EDGES SHALL HAVE A MlNIMUM R.4DlUS OF0.01 lNCN. 2) TYPE ll. HANDRAILS WITH A PERIMETER GREATER THAN 6 1/4 /NCHES SHALL HAVE A GR,4SPABLE FINGER RECESS AREA ON BOTH SIDES OF TNE PROFILE. THE FINGER RECESS SHALL 8EGlN WITHIN A DISTANCE OF 3/4 /NCH MEASURED VERTICALLY FROM THE TALLEST PORTION OF TNE PROFILE AND ACHIEVE A DEPTH OF AT LEAST 5/16 /NCH WITHIN 7/8 /NCH BELOW THE WIDEST PORTION OF THE PROFILE. TNE REQUIRED DEPTH SHALL CONTINUE FOR AT LEAST 3/8 /NCH TO A LEVEL THAT lS NOT LESS THAN 1 3/4 INCHES BELOW THE TALLEST PORTION OF THE PROFILE. THE MlNIMUM WIDTH OF TNE NANDR.4/L ABOVE TNE RECESS SHALL BE 1 1/4 /NCHES TO A MAXIMUM OF 2 3/4 INCNES. EDGES SNALL NAVE A MINIMUM RADIUS OF 0.01 /NCH. R311.7.7.4 EXTERIOR WDODfPLASTIC COMPOSITE GUARDS - WOOD/PLASTIC COMPOSITE GUARDS SHALL COMPLY WlTN THE PROVISIONS OF SECTION R317.4 GUARDRAILS: B312.1 WHERE REQUIRED - GUAROS SHALL BE LOCATED ALONG OPEN-SIDED WALKING SURFACES, INCLUDING STAIRS, R.4MPS AND LANOINGS, THAT ARE LOCATED MORE THAN 30 /NCHES ME4SURED VERTICALLY Tl TNE FLOOR OR GR,4DE BELOW AT ANY POINT WITHIN 36 /NCNES HORIZONTALLY TO THE EDGE OF THE OPEN SIDE. INSECT SCREENING SHALL NOT BE CONSIDERED AS A �UARD. 8312.2 HEIGHT - REQUIRED GUARDS AT OPEN-SIDED WALKING SURFACES, INCLUDING STAIRS, PORCHES, BALCONIES OR LANDINGS, SNALL BE NOT LESS THAN 36 /NCNES HIGH MEASURED VERTICALLY ABOVE THE ADJACENT WALKlNG SURFACE, ADJACENT FIXED SEATING OR THE LINE CONNECTING THE LEADI/JG-EDGES• OF THE TREADS. R312.3 OPENING LIMITATIONS - REQUIRED._,GUARC_-SHALL NOT NAVE OPENINGS FROM THE WALKING SURFACE TO THE REQUIRED 'GUAf?D HElGH7 WHICN ALLOW PASSAGE OF A SPHERE 4 /NCNES IN DIAMETER. � _ �- -- -_ = �--'- - � - =- - 4 0 OOD PLASTIC tifPOSI GU - OOD/PtASTlC COMPOSITE GUARDS SHALL COMPLY WITH E PROV7SlONS QF_SE_ 0 R.317,.;4_ - : � _� � � _- �-` ✓_ --- - ` � DAV10 NORRIS ENGINEERING ' ` � -- j( ( / _, 112 COLEMAN RD. , . `�_. Y � � �/ WINTER HAVEN, FL 33880 (B63) 299-1048 P.E. 32186 Pg. J�-B C.A. 8283