The Cavan-based company said revenues slipped 8% to €2.07 billion in the six months ended June 30th from €2.24 billion during the same period last year.
Chief executive Gene Murtagh said: “We expect that the economic environment will remain weak, with confidence for businesses to make investment decisions curtailed."
Kingspan has more than €1 billion in cash and undrawn credit. So far in 2020 it has committed €400 million to acqusitions that have been completed or on which terms have been agreed.
This week the company announced a deal to buy Slovenian roof and facade manufacturer, Trimo.
Richard Flood, investment manager at Brewin Dolphin Ireland said the results, although down on last year "are well ahead of expectations".