Press release, June 2, 2006

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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 May 29 and June 2, 2006:

Trading date		Number of shares	Weighted average price in euros	Amount in euros
May 29, 2006	bought	23,000	54.92	1,263,264
May 29, 2006	sold	0
May 30, 2006	bought	200,000	53.89	10,778,460
May 30, 2006	sold	0
May 31, 2006	bought	200,000	54.06	10,812,700
May 31, 2006	sold	0
June 1, 2006	bought	186,000	53.93	10,030,589
June 1, 2006	sold	0
June 2, 2006	bought	0
June 2, 2006	sold	0
Total of the period	bought	609,000	54.00	32,885,013
Total of the period	sold	0		0

June 2, 2006