Release no. 08 - 2009 To NASDAQ OMX Nordic Exchange Copenhagen A/S This is a translation of the Danish version. Only the Danish version is legally binding. ROCKWOOL INTERNATIONAL A/S Hovedgaden 584, Entrance C DK2640 Hedehusene Phone: +45 4656 0300 www.rockwool.com 04 June 2009 Major shareholder information from 15. Juni Fonden Pursuant to Section 29 of the Danish Securities Trading Act, Rockwool International A/S hereby announces that it has received information that 15. Juni Fonden (the Foundation of 15 June), CVR-nr. 15232102, in its capacity as the universal successor in the estate of Gerda Elisabeth Kähler has become the owner of 1,532,818 A shares of DKK 10 nominal value and 794,072 B shares of DKK 10 nominal value in Rockwool International A/S equivalent to 10.59% of the share capital and 11.55% of the voting rights. The estate left by the deceased Gerda Elisabeth Kähler hereafter does not hold any shares in Rockwool International A/S. The purpose of the foundation is to be of benefit to the Danish society by - as determined by the trustees of the foundation: a) supporting art and cultural initiatives; b) supporting research and education; c) supporting humanitarian and social initiatives; d) contributing to safeguarding Danish natural heritage and Danish flora and fauna; e) contributing to maintaining a fair balance in Denmark between hunting interests on the one side and considerations for wildlife on the other side, with due regard to both parties. Please direct any queries regarding the above change of ownership to: Niels Heering, Attorney-at-law Gorrissen Federspiel Kierkegaard +45 40 17 75 31