Fed-up public sector workers have taken aim at a state government's billion-dollar stadium spend, warning their fight for better pay and conditions is far from over.

Thousands of teachers, health workers, firefighters and other state servants rallied outside Tasmania's parliament house on Thursday.

The stop-work action, which followed protests in the state's northwest and north on Tuesday and Wednesday, forced schools to open several hours late.

The government has offered a one-year, three per cent pay rise across the public sector while longer-term deals are negotiated.

Unions say the offer is not up to scratch and doesn't address specific issues, such as overtime and leave, in each sector.

Jake, a teacher, said workloads were unsustainable, classrooms were unsafe and his colleagues

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