Minimum Roof Hatch Opening Size

A common size of roof hatch is 36 x 30 for ladder access to the roof however that size does not meet this osha standard.

Minimum roof hatch opening size. In buildings without an occupied roof access to the roof shall be permitted to be a roof hatch or trap door not less than 16 square feet 1 5m2 in area and having a minimum dimension of 2 feet 610 mm. Or larger are available. Recent changes to the international building code require 16 sq. Roof hatches bilco roof hatches provide safe and convenient access to roof areas by means of an interior ladder ship stair or service stair.

The rough framed opening must measure a minimum of 22 by 30 inches. Per osha 1910 23 d 2 the minimum perpendicular distance from the centerline of the steps or rungs or grab bars or both to the nearest permanent object in back of the ladder is 7 inches. If movement of bulky materials through the hatch is anticipated double leaf hatches with openings up to 66 sq. A variety of special sizes are also available to provide an accessible way to install or remove large pieces of equipment from a building.

This 7 inch minimum stand off clearance protects the person climbing the ladder from likely trip hazards that would exist with less free space between the. Attics with mechanical equipment. Ft openings as the standard for various structures. 1009 16 2 protection at roof hatch openings.

Recommended minimum sizes for various types of roof access are shown above. Service full size stair roofhatchsizeis definedbymeasuringitsinsideframe opening andtheroofopeningshouldbe roughlythesameasthehatchsize some industry standardsizesfollow. If the opening is located in a wall it must be at least 22 inches wide and 30 inches high. 36by30inchesforladderaccess 30by54inchesforship orsteep stair access 30by96inchesforservicestairaccess abuilding stypeandsizegenerallywill determinethemethodofegress which in.