OSHA wind safety requirements for construction sites center on a general 40 mph stop-work threshold, with lower cutoffs for specific activities: 30 mph when workers handle materials with large surface areas, 25 mph for powered platforms used in building maintenance, and 20 mph when a crane is hoisting personnel. For cranes, aerial lifts, and scissor lifts, the manufacturer’s rated wind speed controls, and a designated competent person on site has the authority to shut work down whenever conditions warrant.
Wind Speed Thresholds at a Glance
There is no single blanket wind limit for construction. Several standards set different numbers depending on the task and the equipment:
- 40 mph: the general high-wind threshold. Most outdoor construction activity should stop at sustained winds this high unless specific protections are in place.
- 30 mph: the threshold when workers handle sheeting, panels, or other materials with large surface areas that catch wind like sails.
- 25 mph: the operating limit for powered platforms used in building maintenance, such as window-washing rigs.
- 20 mph: the trigger for a qualified-person evaluation when hoisting workers by crane in a personnel platform.
- Manufacturer’s limit: for cranes, aerial lifts, and scissor lifts, the number in the manual governs and overrides any general figure.
These are federal regulatory requirements, not suggestions. Violations lead to citations, fines, and liability when someone gets hurt.
The Competent Person Makes the Call
Nearly every OSHA wind rule places the real-time decision with a “competent person” the employer has designated. That person identifies hazards, assesses changing weather, and has authority to stop work immediately. When they say stop, work stops.
This role matters most in the gray zone below the hard thresholds. A steady 32 mph reading might not trigger the 40 mph rule, but gusts, elevated work surfaces, and lightweight materials can still make conditions dangerous. Gusts routinely exceed sustained speeds by 50 percent or more, and elevated locations see significantly higher wind than ground-level instruments record. Employers must monitor local weather conditions by subscribing to a weather service or using an equally effective method, so the competent person has reliable data to work with.1Occupational Safety and Health Administration. Interpretation on Standards for Use of Cranes During High Wind Conditions
Scaffold Rules in Wind
The federal scaffold standard prohibits work on or from scaffolds during storms or high winds unless a competent person has evaluated conditions and determined it is safe to continue. Workers who stay on a scaffold in marginal conditions must be protected by a personal fall arrest system or by wind screens.2Occupational Safety and Health Administration. 29 CFR 1926.451 – General Requirements
A detail worth flagging: the scaffold standard uses the term “high winds” without assigning a specific mph number. It relies on competent-person judgment. The 25 mph figure from the separate powered-platforms standard is sometimes applied informally to scaffolds as a best-practice benchmark, but that is not what the scaffold regulation itself requires.3Occupational Safety and Health Administration. 29 CFR 1910.66 – Powered Platforms for Building Maintenance
Wind screens and debris netting create a serious secondary hazard. Attaching tarps, mesh, or netting turns a scaffold into a large wind-catching surface. The standard prohibits using wind screens on a scaffold unless the scaffold has been secured against the additional wind forces they impose.2Occupational Safety and Health Administration. 29 CFR 1926.451 – General Requirements In practice, an engineer or qualified person needs to verify the scaffold’s capacity before screens go up. Many collapses happen when a crew installs debris netting for falling-object protection, an unexpected gust hits, and nobody checked whether the frame could handle the load.
Cranes and Hoisting
Crane safety in wind hinges on one principle: the manufacturer’s specifications control. Whatever the manual says about maximum wind speed for a given configuration, boom length, and load radius is the enforceable limit. Exceeding it violates the federal standard requiring employers to follow all manufacturer procedures for equipment operation.4Occupational Safety and Health Administration. 29 CFR 1926.1417 – Operation
When a local storm warning is issued, the competent person must decide whether to implement the manufacturer’s securing recommendations. Even without a formal warning, they must continuously evaluate how wind, ice, and snow affect the crane’s stability and rated capacity and adjust operations accordingly.4Occupational Safety and Health Administration. 29 CFR 1926.1417 – Operation Rated load charts typically do not account for wind acting on the load or the boom. Some manufacturers recommend reducing rated loads when wind exceeds 20 mph, but the specific reduction depends on the load’s surface area, the boom configuration, and the crane model.
Tower Cranes
Every tower crane must have a wind speed indicator mounted above the upper rotating structure. Self-erecting cranes must have the indicator at or above jib level.5Occupational Safety and Health Administration. 29 CFR 1926.1435 – Tower Cranes If one crane’s device fails, the regulation allows temporary use of a functioning indicator on another tower crane on the same site, or having a qualified person estimate the wind.
For erecting, climbing, and dismantling a tower crane, wind must not exceed the speed recommended by the manufacturer. If the manufacturer does not specify one, a qualified person must determine the safe limit.5Occupational Safety and Health Administration. 29 CFR 1926.1435 – Tower Cranes
Hoisting Personnel
Using a crane to hoist workers in a personnel platform triggers a stricter numerical trigger. When wind speed, whether sustained or gusting, exceeds 20 mph at the platform, a qualified person must evaluate whether it is safe to lift. If it is not safe, the lift cannot begin. If the platform is already in the air, the operation must be terminated.6Occupational Safety and Health Administration. 29 CFR 1926.1431 – Hoisting Personnel
Aerial Lifts and Scissor Lifts
The aerial lift standard at 29 CFR 1926.453 does not set a specific wind number. It requires that aerial lifts be operated in accordance with the manufacturer’s instructions. For most boom lifts and scissor lifts rated for outdoor use, manufacturers typically set a maximum operating wind speed of 28 mph. Above that, the operator must lower the platform and stop using the equipment until wind drops back below the rated limit.
In the 15-to-28 mph range, conditions can still be dangerous depending on the specific machine, its height, and the terrain. Postponing work when gusts land in this range is often the right call. The indoor-versus-outdoor rating matters, too: scissor lifts rated only for indoor use carry a 0-mph wind rating and should never be operated outdoors in any wind. Using one outside on a windy day violates manufacturer specifications and creates a serious tip-over risk.
Roofing and Leading Edge Work
Roofing crews face compounding risk in wind. They are elevated, often near unprotected edges, and handling lightweight materials. OSHA’s fall protection standards require guardrails, safety nets, or personal fall arrest systems for anyone working six feet or more above a lower level on a leading edge, low-slope roof, or steep roof.7eCFR. 29 CFR Part 1926 Subpart M – Fall Protection
Where an employer uses a safety monitoring system in place of physical fall protection, the system must be suspended when wind is strong enough to cause loads with large surface areas to swing out of control, or when weather makes walking surfaces slippery. For roof sheathing operations conducted under a fall protection plan, OSHA’s sample plan in Appendix E calls for suspending work when winds exceed 40 mph unless wind breakers are erected.7eCFR. 29 CFR Part 1926 Subpart M – Fall Protection Appendix E is a sample rather than a mandatory provision, but it reflects what OSHA considers reasonable practice and is likely to be cited if an accident occurs during high-wind roof work.
Masonry Walls and Loose Materials
Unsupported masonry walls are especially vulnerable to wind-driven collapse. Any masonry wall over eight feet tall must be adequately braced to prevent overturning, and the bracing must stay in place until permanent structural supports are installed.8Occupational Safety and Health Administration. 29 CFR 1926.706 – Requirements for Masonry Construction A limited-access zone must surround the wall until it is stable. Wind does not need to be extreme to topple an unbraced masonry wall; even moderate gusts can push an eight-foot block wall past its tipping point.
The same logic applies to other temporary structures: fencing, signage, portable toilets, and form panels. Employers must anchor or secure anything that could blow over, blow away, or become a projectile. Items that seem too heavy to move at ground level behave differently when wind catches a flat surface.
Wind does not need to reach a specific threshold to turn loose materials into projectiles. A scrap of plywood or an unsecured tool can injure or kill someone at surprisingly low wind speeds if the right gust catches it. Tools should be stored or tethered, sheeting stacked and secured, and debris cleared throughout the day rather than only at shift end.
When no specific standard covers a wind-related hazard, the General Duty Clause still applies. It requires every employer to provide a workplace free from recognized hazards likely to cause death or serious physical harm.9Occupational Safety and Health Administration. OSH Act of 1970 – Section 5 Duties If a reasonable employer in that industry would recognize the wind hazard as dangerous and could take steps to reduce it, the duty exists regardless of whether a specific regulation names a wind speed.
Your Right to Refuse Dangerous Wind Work
You are not required to risk your life because a supervisor tells you to keep working in dangerous wind. Section 11(c) of the OSH Act prohibits employers from retaliating against any employee who reports unsafe conditions or files a safety complaint.10OSHA. Investigator’s Desk Aid to the OSH Act Whistleblower Protection Provision That protection covers oral and written complaints to OSHA, state safety agencies, and NIOSH.
You may also have the right to refuse dangerous work outright when all four of these conditions are met:
- You asked your employer to fix the hazard (where possible) and they did not.
- You genuinely believe an imminent danger of death or serious injury exists.
- A reasonable person would agree the danger is real.
- There is not enough time to get the hazard corrected through normal channels like requesting an OSHA inspection.
If all four conditions are met, tell your employer you will not perform the work until the hazard is corrected, and stay on the jobsite unless ordered to leave. High-wind situations often satisfy these criteria because the danger is immediate, conditions can change fast, and waiting for an inspector is not practical when a gust could blow someone off a scaffold in the next ten minutes. If your employer retaliates, you have 30 days to file a complaint with OSHA.11Occupational Safety and Health Administration. Workers’ Right to Refuse Dangerous Work
Penalties for Wind-Hazard Violations
OSHA does not treat wind-hazard violations as a paperwork issue. A citation for failing to halt work or secure equipment during dangerous wind can fall into several categories:
- Serious violation: a hazard the employer knew or should have known about and that could cause death or serious injury. Maximum fine of $16,550 per violation as of the most recent adjustment.
- Willful or repeated violation: the employer intentionally disregarded a known requirement or has been cited for the same violation before. Maximum penalty of $165,514 per violation.
These amounts adjust annually for inflation.12Occupational Safety and Health Administration. 2025 Annual Adjustments to OSHA Civil Penalties When a specific regulation applies, the citation references that standard. When no specific standard exists but the hazard was clearly recognizable, OSHA cites the General Duty Clause.9Occupational Safety and Health Administration. OSH Act of 1970 – Section 5 Duties A crane operator ignoring the manufacturer’s wind limits and an employer sending roofers up in 45-mph gusts could both draw willful citations if OSHA finds the decision was deliberate.