DECLARATION OF TRANSACTIONS INVOLVING TREASURY STOCK


In accordance with the regulations regarding share buybacks (Article 241-5 of the general regulations issued by the AMF), Compagnie de Saint-Gobain hereby announces that the following transactions involving treasury stock were carried out between August 1 and August 5, 2005:

Trading date Number of shares bought back Number of shares sold Weighted average price in euros

Amount in euros

August 1, 2005 0 0 0.00 0
August 2, 2005 0 0 0.00 0
August 3, 2005 0 0 0.00 0
August 4, 2005 0 0 0.00 0
August 5, 2005 100,000 0 49.33 4,932,800
Total of the period 100,000 0 49.33 4,932,800

August 5, 2005