(19)

(11)

EP 2 235 281 A2

(12)

(88) Date of publication A3: 27.08.2009 (43) Date of publication: 06.10.2010 Bulletin 2010/40 (21) Application number: 08869157.1 (22) Date of filing: 18.12.2008

(51) International Patent Classification (IPC):  E04C 2/04(2006.01) E04C 2/38(2006.01) (86) International application number: PCT/US2008/087478 (87) International publication number: WO 2009/085981 (09.07.2009 Gazette 2009/28)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 28.12.2007 US 17343 (71) Applicant: United States Gypsum Company Chicago, IL 60661-3676 (US)	(72) Inventor: MCDONALD, David, Bruce Glenview IL 60025 (US) (74) Representative: Carpmael, Robert Maurice Charles et al Marks & Clerk LLP 90 Long Acre London WC2E 9RA 90 Long Acre London WC2E 9RA (GB)