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Exhaust- Catwalk / Platform OSHA and IBC/ASCE Compliance Criteria



  1. Railing overall height is 42 inches per OSHA standard (section 1910.23(e)(1)). 
  2. Top railing is smooth surfaced throughout the length per OSHA standard (section 1910.23(e)(1)). 
  3. The ends of the top railings do not overhang the terminal posts per OSHA standard (section 1910.23(e)(1)). 

Intermediate Railing

  1. Railing separation (from top railing to intermediate railing) is 20.5 inches, centerline to centerline, per OSHA standard (section 1910.23(e)(1)). 

Vertical Members

  1. Vertical members are constructed of 1.5x1.5x0.1875" square tubing with section modulus of 0.314 in3 per OSHA standard (section 1910.23(e)(3)(iii)). 
  2. The vertical member was also failure tested by applying a 200 lb load to the end while fixing the opposite end as outlined in section 1910.23(e)(3)(iv). The member did not incur any plastic deformation. 
  3. Placed not more than 8 feet apart, centerline to centerline, per OSHA standard (section 1910.23(e)(3)(iii)).


  1. Every ladderway floor opening or platform shall be guarded by a standard railing with standard toeboard on all exposed sides (except at entrance to opening), with the passage through the railing either provided with a swinging gate or so offset that a person cannot walk directly into the opening (section 1910.23(a)(2)).


  1. Toeboards are 4 inches tall, constructed of 4x0.125" solid steel strap per OSHA standard (section 1910.23(e)(4)). 
  2. Bottom of toeboard sits at level of walkway and extends upward 4 inches with not more than 0.25 inches of clearance above the floor level per OSHA standard (section 1910.23(e)(4)).

Catwalk and Platform Frame

  • a. Catwalk and platform frame structures are designed for an operating load of (also with a safety factor applied):
  1. 40 lb/ft2 uniform live load per IBC standard (section 1607) and ASCE 7-10 (section 4.4).
  2. 300 lbs concentrated live load located so as to produce the maximum load effects in the structural members , distributed over an area of 2.5 ft by 2.5 ft per IBC standard (section 1607) and ASCE 7-10 (section 4.4).
  • When loaded with the design loads stated above, the deflection of the floor members does not exceed 1/240th of the span per IBC standard (section 1604.3).

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