Offer Update

Compagnie de Saint-Gobain
02 December 2005

Not for release, publication or distribution, in whole or in part, in, into or
from Australia or Canada

2 December 2005

                           Compagnie de Saint-Gobain


                      Successful Recommended Offer for BPB


                      Offer declared wholly unconditional


Saint-Gobain announces that all conditions of the Recommended Offer have been
satisfied or waived. Accordingly, the Recommended Offer has been declared
unconditional in all respects and will remain open for acceptance until further
notice.

As at 1.00 p.m. today, valid acceptances of the Recommended Offer had been
received in respect of 432,761,504 BPB Shares, representing 86.12 per cent. of
the issued BPB Shares (1).  All of these acceptances counted towards the
satisfaction of the acceptance condition and of these acceptances, acceptances
in respect of 127,778 BPB Shares were received from the BPB Directors,
representing 0.03 per cent. of the issued BPB Shares.

The consideration will be despatched by first class post on or before 16
December 2005 to BPB Shareholders who have validly accepted the Recommended
Offer on or before the date of this announcement. Thereafter, consideration will
be despatched to BPB Shareholders who validly accept the Recommended Offer,
within 14 days of receipt of an acceptance valid in all respects.

Enquiries

Saint-Gobain (for analysts and investors)

Florence Triou-Teixeira, Head of IR                  Tel: [phone]
Alexandre Etuy, Deputy Head of IR                    Tel: [phone]

BNP Paribas (joint financial adviser to Saint-Gobain)

Thierry Dormeuil                                     Tel: [phone]
Oliver Ellingham                                     Tel: [phone]

UBS Investment Bank (joint financial adviser and broker to Saint-Gobain)

Charles-Henri Le Bret                                Tel: [phone]
Liam Beere                                           Tel: [phone]

Brunswick (PR adviser to Saint-Gobain)

John Sunnucks                                        Tel: [phone]
Sophie Fitton                                        Tel: [phone]

Notes

(1) As disclosed in the Offer Document, prior to the commencement of the Offer
Period, BNP Paribas and its affiliates, who are acting in concert with the
Offeror, held (through BNP Paribas Arbitrage SNC) a long position of 8,000,000
BPB Shares, representing 1.59% per cent. of the issued BPB Shares, as a hedge in
relation to an open interest in an equity swap that consists of a basket of
shares which includes 8,000,000 BPB Shares. As the equity swap matured on 5
September 2005 and its hedge was unwound, the 8,000,000 BPB Shares were sold and
BNP Paribas Arbitrage SNC no longer hold the long position.

Copies of the Recommended Offer Document and the New Form of Acceptance are
available for collection (during normal business hours) from Capita Registrars
at PO Box 166, The Registry, 34 Beckenham Road, Beckenham, Kent BR3 4TH.

Further information on Saint-Gobain is available on Saint-Gobain's website
www.saint-gobain.com

Terms used in this announcement shall have the meaning given to them in the
Recommended Offer Document.

The Recommended Offer in the United States is made solely by the Offeror and
neither BNP Paribas, UBS nor any of their respective affiliates is making the
Offer into the United States.

The Saint-Gobain Directors and the Offeror Directors accept responsibility for
the information contained in this announcement. To the best of the knowledge and
belief of the Saint-Gobain Directors and the Offeror Directors (who have taken
all reasonable care to ensure that such is the case), the information contained
in this announcement for which they are responsible is in accordance with the
facts and does not omit anything likely to affect the import of such
information.

BNP Paribas and UBS are acting exclusively for Saint-Gobain and the Offeror in
connection with the Recommended Offer and no one else, and will not be
responsible to anyone other than Saint-Gobain and the Offeror for providing the
protections afforded to respective clients of BNP Paribas and UBS nor for
providing advice in relation to the Recommended Offer or any other matter
referred to herein.

This announcement does not constitute an offer to sell or an invitation to
purchase any securities or the solicitation of an offer to buy any securities.


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            The company news service from the London Stock Exchange