More than 500 university staff members have signed an open letter demanding action over workload following the death of a lecturer earlier this year.
In the letter they say their workload is 'simply too high' and it is affecting the physical and mental health of some staff.
The letter was drafted by the Cardiff University branch of the University College Union after business tutor Malcolm Anderson was found dead outside his office on 19 February.
An inquest heard he had been “silently struggling” with his workload.
A staff survey showed that 4 in 5 staff regularly work unpaid overtime in the evenings or at the weekend in order to keep on top of their workload.
Half of all UK academics suffer stress-related mental health problems. At Cardiff this has even been a factor in colleagues taking their own lives.
The university says several measures are already in place to ensure staff are supported. It says it has not formally received the letter but will release an official response once it does.