More than 1,000 trade union health and safety representatives are signed up to take part as the summer heatwave continues.
The TUC says a maximum working temperature is needed to keep workers safe, as working in hot weather can lead to dehydration, tiredness, muscle cramps, fainting, and – in the most extreme cases – loss of consciousness.
Workers who are working for long periods in high temperatures are at serious risk of sunstroke, heat stress and even skin cancer.
During the “week of action”, trade union reps will check workplace temperatures and discuss the protective steps employers can take. This can include ways to keep workplace buildings cool, sensible hours, shaded areas for outdoor workers, allowing flexible working and temporarily relaxing workplace dress codes.
Unlike other countries, the UK doesn’t have maximum legal working temperatures. We do, however, have minimum working temperatures, with the HSE’s code of practice setting out that the temperature in a workplace should normally be at least 16°C.
The TUC is calling for the introduction of maximum workplace temperature guidelines, with employers taking steps to reduce temperatures if they get above 24°C and workers feel uncomfortable. The union body said work should stop above a maximum temperature of 30°C, or 27°C for those doing strenuous jobs.
Paul Nowak, TUC’s general secretary, said: “Everyone should be safe at work. But working in a heatwave can be dangerous – especially when your employer wants you to carry on regardless.
“That’s why union reps are taking action this week to keep their workmates safe in the heat. And it’s why we’re calling on the Government to strengthen legal protections with a maximum working temperature.
“A lot of the best safety steps are just common sense. For example, employers should allow flexible hours to avoid the hottest parts of the day. And indoor workplaces should be kept at comfortable temperatures, with relaxed dress codes.
“If you’re concerned about your working conditions, joining a union is the best way to make sure that your safety is respected by your employer.”
