Construction work is inherently dangerous and various high-risk activities are performed every day. This can become even riskier when the weather changes for the worse. It is therefore vital to include potential adverse weather conditions in any risk assessment and address mitigating factors.
The main aspects include rain, strong wind, lightning and thunder. But further to these, temperature extremes, poor visibility and even hail, can have an impact on operations. Risks associated with temperature extremes can include dehydration, hyperthermia or on the opposite side of the spectrum, hypothermia. During such conditions, working hours should be carefully regulated and workers allowed to take frequent breaks in order to limit exposure.
Workers should be specifically aware of hazards such as slips, trips and falls caused by wet or icy conditions. Working at heights during strong winds and also the fact that the weather conditions can change very quickly, must be considered. Ideally, and most probably on larger projects, the weather should be monitored by means of daily/hourly updates or by setting up small weather stations.
Most large plant items such as tower cranes, mobile cranes and concreting equipment have certain limitations related to strong wind and operating limits during rain or lightning. These have to be considered and included in training and risk assessments. It is recommended to also have a formal adverse weather conditions plan or policy, documented and communicated to all employees. It’s best to take a pro-active approach and not to wait until the weather changes. Contingencies should be well planned and available.
As a last resort, personal protective equipment (PPE) can be used, such as good quality rain suits, gumboots and warm clothing, but in most conditions, the best remedy is normally to stop work until the weather improves.
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