Trade unions are warning that up to nine construction sites in Dublin could disrupted today by the ongoing crane drivers dispute.
The Unite trade union is picketing three sites as part of industrial action, which began last week.
Pickets have been put in place at sites on Sir John Rogerson’s Quay, Windmill Lane and City Quay - with the knock-on effects expected to be felt at other sites across the city.
A decision on whether to extend the action is expected this evening.
Members were asked to vote on further measures last Friday - with results of the ballot expected by 5pm.
Unite's regional officer for construction, Tom Fitzgerald said today's action is the second in series of strike days aimed at achieving pay rises for workers that "reflect their level of skill and responsibility."
“It is time for construction workers to start sharing in the construction sector’s recovery," he said.
"Since 2012, profits per employee in the sector have more than doubled, while wages are still below 2004 levels in real terms.
"Unite is determined to ensure that construction jobs are decent jobs paying decent wages.”