Stairway Roof Fire Rating

What i found is still somewhat inconclusive.

Stairway roof fire rating.

The slope of the test specimen is preselected and since steeper slopes are more of a challenge due to melting material feeding the fire the rating applies to the maximum slope passed. 6 usg fire resistant assemblies test certification test conditions and fire and sound tested assemblies listed in this selector are based on characteristics properties and performance certificationof materials and systems obtained under controlled test conditions as set forth in the appropriate astm standard in effect at the time of test. Openings in the roof shall not be located within 4 feet 1220 mm of the fire wall. Vertical exit enclosures four stories or mor e shall be 2 hour fire resistance rat ed.

Interior exit stair ways shall be enclosed. The lower roof assembly within 4 feet 1220 mm of the wall has not less than a 1 hour fire resistance rating and the entire length and span of supporting elements for the rated roof assembly has a fire resistance rating of not less than 1 hour. Certified 1 hour fire rating. In buildings four or more stories or more than 40 feet 12 192 mm in height above grade one stairway shall extend to the roof surface through a stairway bulkhead complying with section 1509 2 unless the roof has a slope steeper than 20 degrees 0 35 rad access to setback roof areas may be through a door or window opening to the roof.

Bessler be 119 series one hour fire rated wood attic stairs 350 lb capacity this patent pending stairway model meets the international builders code and complies with astm e 119 fire code. Bilco roof hatches provide safe and convenient access to roof areas by means of an interior ladder ship stair or service stair. National gypsum company fire and sound selector ul type designation product name 5 16 gold bondfsw brand fire shield gypsum board 5 8 gold bond brand fire shield gypsum board type x 5 8 gold bond brand fire shield exterior soffit board type x 5 8 gold bond brand hi abuse xp fire shield gypsum board type x 5 8 gold bond brand hi impact xp fire shield. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.

On this building the ibc allows for a rated lid as long as it matches the rating of the vertical walls ibc 2009 section 708 12. Ver tical exit enclosur es les s than f our stor ies shall be 1 hour f ire resistance rated. A variety of special sizes are also available to provide an accessible way to install or remove large pieces of equipment from a building. The number of stories shall be co mp uted as al l f loor lev els i ncludi ng bas ements but ex cludi ng mezzan ines.