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.
Osha required roof parapet holddown.
For general industry employers must ensure that workers are protected at heights of 4 feet or more 1910 28 b 1 i.
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.
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.
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.
Fall protection requirements for construction workers doing work while on a roof.
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.
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.
When conditions warrant the height of the top edge may exceed the 45 inch height provided the guardrail system meets all other criteria of this paragraph.