Top edge height of top rails or equivalent guardrail system members shall be 42 inches 1 1 m plus or minus 3 inches 8 cm above the walking working level.
Osha required roof parapet holddown.
The fall protection measures listed above are required for workers who operate felt laying machines or other equipment that is pulled backward no matter the potential fall height.
Intermediate structural members for example midrails or screens must be installed when there is no wall or parapet wall at least 21 inches high 29 cfr 1926 502 b 2.
This is in response to your fax submitted on september 2 2003 to the occupational safety and health administration osha and as a follow up to a telephone conversation on september 22 2003.
To meet osha requirements in the construction industry employers must provide workers with fall protection whenever they work at heights of six feet or more above a lower level 29 cfr 1926 501 b 1.
An exception to these measures is that the parapet must be at least 36 inches high and perpendicular to the direction of travel.
Fall protection requirements for construction workers doing work while on a roof.
Midrails when used must be installed midway between the top edge of the guardrail system and the walking working surface 29 cfr 1926 502 b 2 i.
If a parapet wall is a minimum of 30 high and the height plus the width of the wall is a least 48 then it was determined that the fall hazard was removed and this was a compliant method to protect construction employees.