ROCKWOOL INTERNATIONAL A/S Hovedgaden 584, Entrance C DK 2640 Hedehusene Phone: +45 4656 0300 www.rockwool.com Release no. 13 - 2007 To the Copenhagen Stock Exchange This is a translation of the Danish version. Only the Danish version is legally binding. 31 August 2007 Major shareholder announcement Rockwool International A/S Pursuant to section 29 of the Danish Act on Securities Trading we hereby announce that the major shareholders ATP and ATP Invest have informed Rockwool International A/S that they now jointly hold less than 5% of the share capital. Further information: Per Palludan, Vice President, Group Legal Department.