If penetrating the outside of the wall is not an option a freestanding non penetrating railing can be used to keep people back to from the roof edge.
Roof parapet height code.
The minimum height of a parapet above any wall anchor shall be 12 inches 305 mm.
Including parapets of sufficient height is also advantageous when green features.
The ontario building code parapet walls 9 20 6 5.
Osha guardrail height requirements.
Ibc guardrail height requirements.
However fall protection would still be required for work on roof top equipment design features at heights greater than 6 feet over the edge of the parapet on the face of the building and for work near unguarded roof openings and skylights.
If you can penetrate your roof parapet there are several roof parapet railing solutions.
Parapet walls 1 the height of parapet walls above the adjacent roof surface shall be not more than three times the parapet wall thickness.
Ibc guardrail is required to be a minimum of 42 above the leading edge of the tread or walking surface.
Osha also requires a top rail at 42 above the working working surface but allows for some flexibility of 3 inches from the 42.
If a reinforced concrete beam is provided at the top of the wall the minimum height above the wall anchor may be 6 inches 152 mm.
Install a non penetrating full height railing.
Parapet corrective work must be performed in conjunction with the installation of tension roof anchors.
2 parapet walls shall be solid from the top of the parapet to not less than 300 mm below the adjacent roof level.
Buildings greater than 22 feet 6706 mm in height with roof slopes less than 2 4 units vertical in 12 units horizontal 20 percent slope shall be provided with a parapet railing fence or combination thereof not less than 42 inches 1067 mm in height.
Perimeter of the parapet.
The minimum height of a parapet wall above the roof surface is 30 inches.
However when a roof slopes down toward an exterior wall and parapet with a slope greater than 2 12 further analysis is required to determine if a taller parapet is necessary.
Per asce 7 the mean roof height h is defined as the average of the roof eave height and the height to the highest point on the roof surface except that for roof angles of less than or equal to 10 the mean roof height is permitted to be taken as the roof eave height.
Employees shall be protected from falls from roofs that are of a height of more than 20 feet by the use of a roof jack system as provided in section 1724 a a minimum of 24 inch high parapet or other method affording equivalent protection.
