One of Ireland's biggest companies, CRH, has reported pre-tax profits of 25m euros for the six months to June - a 77% drop on the 108m euros reported for the same time last year.
In Northern Ireland the company owns Northstone, Tyrone Brick and Springvale EPS.
Revenues fell by 8% to 7.6bn euros from 8.2bn euros.
CRH said that construction activity in Ireland continued to run well below last year's levels.
It said that European economic indicators have been more encouraging although uncertainties remain.
It added that concerns relating to the recovery in the US have increased with a continuing flow of disappointing economic data in recent weeks.