SIPTU has rejected a call by the Construction Industry Federation for a 12-month pay freeze and a 30% cut in entry rates for construction workers.
SIPTU General President Jack O'Connor said that the call from CIF General Director Tom Parlon had the potential 'to turn building sites into battle grounds'.
He said that proposals such as those from the federation were 'neither morally justifiable nor economically advisable'.
Speaking on RTÉ Radio's Morning Ireland, Mr Parlon said the aim was to protect jobs in construction.
Mr O'Connor was speaking ahead of a meeting in Mullingar yesterday evening as part of a series of meetings in a campaign for equal treatment for agency workers in sectors such as construction.