OSHA 29 CFR 1926.105 Safety Net Rules: Estimator How-To Guide
Estimating commercial projects or bridge structures involving high-elevation work requires a clear strategy for fall protection. When conventional fall protection options cannot be used, federal standards require the installation of safety nets. Navigating OSHA 29 CFR 1926.105 helps estimators and project managers ensure that safety nets are properly scoped, procured, and scheduled before field operations begin.
Determining When Safety Nets Are Required
Under 29 CFR 1926.105(a), safety nets must be provided when workplaces are more than 25 feet above the ground, water surface, or other surfaces. However, this mandate applies specifically where other protective methods are impractical. These alternate systems include:
- Ladders
- Scaffolds
- Catch platforms
- Temporary floors
- Safety lines
- Safety belts
When reviewing drawings and project conditions, estimators should assess whether any of those practical alternatives can be safely implemented. If jobsite geometry or structural access prevents their use at heights exceeding 25 feet, safety net installation must be planned as a mandatory protective measure.
Sizing Nets and Planning Vertical Clearances
Subcontractors and general contractors must price the correct size and layout of safety netting. The standard enforces strict physical placement rules that impact material quantities:
- Outward extension: Nets must extend 8 feet beyond the edge of the working surface where employees are exposed to fall hazards.
- Vertical position: Nets must be installed as close under the work surface as practical, but never more than 25 feet below that surface.
- Clearance below: The net must hang with sufficient clearance to prevent a falling user from contacting surfaces or structures below. Clearance distances must be determined through impact load testing.
- Bridge work: For bridge construction, the standard clarifies that only one level of nets is required.
Estimators reviewing takeoffs should confirm perimeter dimensions to ensure an extra 8 feet of net overhang is included along open working edges. If reviewing overall jobsite protection alongside other work packages, cross-reference these requirements with broader fall arrest and safety net considerations.
Verifying Net Hardware and Material Performance
Safety netting must comply with rigorous structural criteria under the standard. Failing to specify compliant hardware during procurement leads to rejected materials and jobsite delays. The regulation outlines several mechanical requirements:
- Mesh dimensions: Mesh size must not exceed 6 inches by 6 inches.
- Impact resistance: All new nets must meet accepted performance standards providing a minimum impact resistance of 17,500 foot-pounds, certified by the manufacturer.
- Certification labels: Every net must bear a label confirming proof testing.
- Edge ropes: Perimeter edge ropes must provide a minimum breaking strength of 5,000 pounds.
- Connections and hooks: Forged steel safety hooks or shackles must be used to attach the net to its structural supports, and connections between adjacent net panels must develop the full strength of the net.
Estimators should confirm that supplier quotes explicitly include forged steel safety hooks or shackles, proof-tested labeling, and matching edge rope ratings rather than generic rigging materials.
Factoring Safety Net Testing into the Project Schedule
Compliance under 29 CFR 1926.105 is not limited to buying materials; it directly influences schedule duration. The standard states that where safety net protection is required, operations shall not begin until the net is fully in place and has been tested.
Because clearances underneath must be verified by impact load testing before trade crews access the work area, schedules must reflect installation and testing windows. If work starts prematurely without completed tests, the project violates federal safety requirements. Estimators should account for these preliminary testing activities when putting together crew hours and general site overhead.
Allocating Net Costs in the Bid Structure
Because safety netting involves substantial materials, specialized rigging hardware, and preliminary load testing, estimators must assign these expenses correctly within the estimate. Rather than burying these items in broad trade line items, safety netting and impact verification are frequently tracked within the project general conditions estimate.
Clearly outlining who furnishes, installs, proof-tests, and moves the nets prevents disputes between general contractors and framing, steel, or specialty subcontractors on elevated builds.
Sources
Occupational Safety and Health Administration: 29 CFR 1926.105 - Safety Nets
Published October 28, 2026. No affiliate links on this page. Facts come from the sources linked above; check them for updates.