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3308.1 Scope
Safety netting systems and guardrail systems shall be provided as required by this section to protect unenclosed perimeters. Except where this section authorizes the temporary removal of unenclosed perimeter protection, no work shall occur, nor shall materials be stored on any level where required unenclosed perimeter protection is not installed.
3308.2 Permit
A permit is not required for the installation of safety netting systems and guardrail systems that are in accordance with this section. A permit is required for alternative methods granted under Section 3308.8, including but not limited to cocoon systems, climbing formwork, and enclosure panels.
3308.3 Safety Netting Design and Documentation
Safety netting shall be designed and provided with documentation in accordance with Sections 3308.3.1 through 3308.3.5.
3308.3.1 Design
Safety netting systems shall be designed by a registered design professional to meet temporary loads, including but not limited to wind, as prescribed in Chapter 16. The registered design professional shall take the supporting structure into account when designing the installation and shall include details of connections, anchorages, and supports. The minimum loads for vertical net cables required by Section 3308.5.3 need not be added to wind loads in determining the maximum lateral force, but in no event shall the maximum design load for the cables be less than that required by Section 3308.5.3. A reduction in the surface area due to the openings in vertical or horizontal net fabric or partially enclosed perimeter panel is permitted provided that the force at design wind speed is derived from manufacturers' test data or other testing or methods acceptable to the commissioner.
3308.3.2 Site Safety Plans
Details of the safety netting system shall also be shown on the site safety plan, where such plan is required by Section 3310.
3308.3.3 Make and Model
The make and model of vertical and horizontal netting, along with the connections and supports, shall be acceptable to the registered design professional responsible for the design of the safety netting systems in accordance with Section 3308.3.1. The make and model, along with acceptance of the make and model by such registered design professional, shall be indicated as a note on the drawings, or in the form of a signed, sealed, and dated letter from such registered design professional that is kept with the drawings.
3308.3.4 Flame Retardant
Vertical and horizontal safety netting shall be flame retardant in accordance with NFPA 701. Documentation of such shall be provided by the manufacturer and shall be noted on the drawings by the registered design professional responsible for the design of the safety netting systems in accordance with Section 3308.3.1, or shall be recorded by such registered design professional in the form of a signed, sealed, and dated letter from such registered design professional, with such letter kept with the drawings.
3308.3.5 Tensile Strength
The tensile strength for the structural net utilized in connection with the horizontal safety netting system shall be noted on the drawings by the registered design professional responsible for the design of the safety netting systems in accordance with Section 3308.3.1, or shall be recorded by such registered design professional in the form of a signed, sealed, and dated letter from such registered design professional, with such letter kept with the drawings. Where required by Section 3308.6.3, the strength shall be confirmed by testing; the results of the test shall be documented in the form of a signed, sealed, and dated letter from the registered design professional responsible for the design of the safety netting systems in accordance with Section 3308.3.1. Such letter shall be kept with the drawings.
3308.4 Responsibility and Supervision
The permit holder for the project, or where a permit is required by Section 3308.2, the permit holder of such, shall be responsible for complying with the requirements of Section 3308. A competent person designated by such responsible permit holder shall supervise the installation, inspection, adjustment, maintenance, repair, and removal of all safety netting systems and guardrail systems, along with any support, connection, or component, or alternative methods granted under Section 3308.8.

Exception: Where this section requires another entity to perform an inspection.
3308.5 Vertical Safety Netting Systems
Vertical safety netting shall be installed and maintained to cover all unenclosed perimeters.

Exceptions:
  1. Vertical safety netting is not required at the:
    1. Story at grade; or
    2. The working deck; or
    3. Any story in concrete construction where the formwork has not been stripped, provided such floor is no more than four stories or 40 feet (12 192 mm) below the working deck; or
    4. Any story in steel construction where the slab has not been poured.
  2. Vertical safety netting is not required at a level where a supported scaffold covers the full width of the unenclosed perimeter, provided the scaffold is decked and flush against the building at such level where the unenclosed perimeter exists, with no gap between the scaffold and the building greater than 3 inches (76 mm), and also provided that the scaffold is provided with netting and guardrails in accordance with Section 3314.8.
  3. Vertical safety netting is not required to protect an unenclosed window opening, provided such window opening is enclosed with a sill not less than 2 feet 6 inches (762 mm) in height and protected with vertical mullions or piers with a maximum opening of 5 feet (1524 mm) and a noncorrosive wire cable capable of withstanding a load of at least 200 pounds (890 n) applied in any direction except upward.
  4. Vertical safety netting is not required for a building whose final height will be 4 stories or 40 feet (12 192 mm) or less in height.
  5. Vertical safety netting is not required for a minor alteration or ordinary repair.
3308.5.1 Openings
The largest opening area for debris netting when used vertically shall not be larger than 1 square inch (25.4 mm2).
3308.5.2 Height
Where required, vertical safety netting shall extend to cover all openings in the unenclosed perimeter to a height of at least 60 inches (1524 mm) above the floor or, where installed at the roof level, the roof.
3308.5.3 Cables
Vertical safety netting shall be secured to noncorrosive wire cable capable of withstanding a load of at least 200 pounds (90.7 kg) applied in any direction except upward. The cables shall be located at a height of 60 inches (1524 mm), 42 inches (1067 mm), 21 inches (533 mm), and 0 inches (0 mm) above the level of the floor or, where installed at the roof level, the roof. Where the vertical safety netting extends above 60 inches (1524 mm) in height, a cable shall also be placed at the top of the netting, with intermediate cables between the 60 inch (1524 mm) cable and the top cable as needed to satisfy the design requirements of Section 3308.3.

Exceptions: In lieu of a cable:
  1. At 60 inches (1524 mm) or above, a toprail made of wood, pipe, or structural angle meeting the requirements of Section 3308.7.3.
  2. At 42 inches (1067 mm) and 21 inches (533 mm), midrails made of wood, pipe, or structural angle meeting the requirements of Section 3308.7.3.
  3. At 0 inches (0 mm), a toeboard meeting the requirements of Sections 3308.7.2 and 3308.7.3, provided the net is secured to the toeboard.
3308.5.4 Taut Systems
Where the vertical safety netting relies upon a taut system, the net and cables shall be maintained taut. A positive tensioning system such as a turnbuckle shall be provided to keep the cable taut.
3308.5.5 Friction Connections
Wood installations that utilize a friction connection are not permitted.
3308.5.6 Temporary Removal
Vertical safety netting may be temporarily removed in the immediate area where active loading or unloading operations are occurring, or where perimeter work is occurring, provided that:
  1. A controlled access zone is established to prevent unauthorized personnel from entering the area where the nets are removed; and
  2. Immediately prior to the removal of the nets the floor is broom swept and cleared of all material, equipment, and debris to a distance of at least 10 feet (3048 mm), in all directions, from the area where the vertical nets will be removed.
Exceptions: The following material does not have to be removed to a distance of at least 10 feet (3048 mm), in all directions:
  1. Material and equipment related to the loading or unloading operation or perimeter work.
  2. Stored materials in accordance with Section 3303.4.5.2.
3308.5.6.1 Restoring Nets
The vertical safety nets shall be reinstalled immediately following the end of active loading or unloading operations, or active work, or at the end of the workday, whichever occurs sooner.
3308.5.7 Permanent Removal
Vertical safety netting systems may be removed from floors where the façade has been installed and all such openings in the façade, including for windows, have been permanently enclosed to a height of at least 60 inches (1524 mm) above the floor. Vertical safety netting systems may be removed from the roof where the final parapet or guardrail has been installed.
3308.6 Horizontal Safety Netting Systems
Horizontal safety netting shall meet the requirements of Sections 3308.6.1 through 3308.6.4.
3308.6.1 Where Required
Horizontal safety netting shall be installed and maintained as follows.
3308.6.1.1 During Construction
When, during the course of new building construction, or during the vertical or horizontal enlargement of an existing building, the uppermost walkable floor reaches a height of six stories or 75 feet (22 860 mm) above the level of the ground or an adjoining roof, horizontal safety netting shall be provided at a level not more than two stories or 30 feet (9144 mm) below:
  1. In concrete structures: the stripping floor; or
  2. In steel structures: at the uppermost story where the concrete floor slab has been poured.
Exception: When tarpaulins encase one or more floors immediately below the finished concrete floor in order to maintain temporary heat, the horizontal netting may be located no more than three floors below the finished concrete floor.
3308.6.1.2 During Demolition
When the demolition of the exterior walls or the roof of a building occurs at a height greater than 6 stories or 75 feet (22 860 mm), horizontal safety netting shall be provided at a level not more than two stories or 30 feet (9144 mm) below the story from which the exterior walls and roof are being removed.

Exception: Demolition of exterior walls only for the purposes of the alteration, maintenance, or repair of a façade shall be in accordance with Section 3308.6.1.3.
3308.6.1.3 During Façade Construction, Alteration, Maintenance, or Repair
Where unique hazards associated with the construction, alteration, maintenance, or repair of a façade exist to the public and property, horizontal safety netting shall be provided as required by the commissioner.
3308.6.1.4 Supported Scaffold Alternative
In lieu of horizontal safety netting in accordance with Sections 3308.6.1.1 through 3308.6.1.3, a supported scaffold may be utilized provided such supported scaffold covers the full width of the unenclosed perimeter, the scaffold is decked and flush against the building at the level where work is occurring, with no gap between the scaffold and the building greater than 3 inches (76 mm), and also provided that the scaffold is provided with netting and guardrails in accordance with Section 3314.8.
3308.6.1.5 Hoisting Area
Where approved by the commissioner, horizontal safety netting may be omitted in designated crane, derrick, or hoisting areas.
3308.6.1.6 Temporary Removal
Horizontal safety netting may be temporarily removed in the immediate area where active loading or unloading operations are occurring, or where perimeter work is occurring, or to relocate the nets to a higher level, provided that no concrete work, including formwork placement or stripping, no structural steel placement or assembly, and no work within 10 feet (3048 mm) from an unenclosed perimeter of the building occurs on levels above the horizontal safety netting. Horizontal safety nets shall be reinstalled immediately following the end of active loading or unloading operations, or active work, or at the end of the workday, whichever occurs sooner.
3308.6.1.7 Permanent Removal
Horizontal safety netting systems may be permanently removed as follows:
  1. Horizontal safety netting systems installed for the construction of a building in accordance with Section 3308.6.1.1 may be removed after all concrete has been poured at the highest level and all concrete stripping work at the highest level has been completed.
  2. Horizontal safety netting systems installed for the demolition of a building in accordance with Section 3308.6.1.2 may be removed after the demolition has progressed to within six stories or 75 feet (22 860 mm) above the ground or adjoining roof level.
  3. Horizontal safety netting systems installed for façade work in accordance with Section 3308.6.1.3 may be removed after all façade work above the level of the nets has been completed.
3308.6.2 Horizontal Safety Netting Systems Requirements
Horizontal safety netting systems shall meet the requirements of Sections 5, 6.3, 6.4, 6.5, 6.6, 7, 8, 10.1, 10.4, 10.5, 10.6, 10.7, 11, and 13 of ANSI/ASSE A10.11, as modified as follows.
3308.6.2.1 Personnel Net
Throughout the standard, the term "personnel net" shall be amended to read "structural net."
3308.6.2.2 Should and Shall
Throughout the standard, the term "should" shall be amended to read "shall."
3308.6.2.3 Entanglement
The phrase, "and to minimize entanglement of the persons head, arms, and legs when arresting the fall," shall be deleted from Section 6.3 of ANSI/ASSE A10.11.
3308.6.2.4 Arresting a Fall
The phrase "when arresting a fall," shall be deleted from Section 6.4 of ANSI/ASSE A10.11.
3308.6.2.5 Size of Debris Net Openings
Section 6.6 of ANSI/ASSE A10.11 shall be amended by adding a new sentence at the end of the section, as follows, "However, in no case shall the largest opening area for debris netting when used horizontally be larger than 1/2 square inch (12.7 mm2)."
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