Johannesburg - Wage talks between parking marshalls and their employer Ace Parking deadlocked on Thursday, the Commercial Services and Allied Workers' Union (Cosawu) said.
Union organiser Wilson Makola said shop stewards rejected another offer by the company on Thursday morning.
This meant the union would march to the department of home affairs to hand over a memorandum of grievances on Friday.
The march follows a two-day strike at the offices of Ace Parking in Johannesburg. The marshalls are demanding a minimum wage of R3 500, a provident fund and other benefits.
The were also demanding an end to privatisation of roads and parking services, Makola said.
Ace Parking managing director Juliet Paulsen said the company had held talks with union officials, shop stewards and other employees in an effort to avert the strike.
"We explained that our company was not in a financial position to accede to their demands and placed an improved compensation scheme on the table, which was rejected.
"We are also surprised that employees are now also striking in support of a demand to end privatisation of parking services.
"Our company is not the decision-maker as far as privatisation is concerned. However, the very privatisation was the direct cause of employment for our parking marshalls, " she said
The march starts at noon at Beyers Naude Square, in the Johannesburg CBD.