Roof Parapet Height Requirements

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.

Roof parapet height requirements.

E slopes 0 12 through 5 12 multiple unit roof coverings. 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. 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. Parapet corrective work must be performed in conjunction with the installation of tension roof anchors.

The minimum height of a parapet above any wall anchor shall be 12 inches 305 mm. Where building parapet heights exceed 42 inches special provisions shall be employed to provide a safe means of access to the top of the parapet for rigging purposes if such access is necessary to the safe performance of the work. 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. Has your company ever utilized the height width calculation for parapet walls to be used for fall protection.

G parapets of excessive height. This is in response to your letter of january 28 1983 concerning perimeter protection at setback roof levels. 1910 29 b 1 the top edge height of top rails or equivalent guardrail system members are 42 inches 107 cm plus or minus 3 inches 8 cm above the walking working surface. This new r value is r 33 which is an increase in insulation thickness.

A parapet height of 29 inches where employees are exposed to falls from a roof does not comply with the height requirement in 29 cfr 1910 23 e 1 and can not be considered acceptable by osha. The new parapet wall must not only meet the 42 height requirement but also account for the new energy code that was implemented on may 12 2020 for roof systems. 2015 ibc code commentary.