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(11)

EP 3 268 553 A1

(12)

(43) Date of publication: 17.01.2018 Bulletin 2018/03 (21) Application number: 16708859.0 (22) Date of filing: 19.02.2016

(51) International Patent Classification (IPC):  E04B 9/00(2006.01) E04B 9/06(2006.01) E04B 9/24(2006.01) E04B 9/04(2006.01) E04B 9/12(2006.01) (86) International application number: PCT/US2016/018650 (87) International publication number: WO 2016/144504 (15.09.2016 Gazette 2016/37)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA MD (30) Priority: 10.03.2015 US 201514643453 10.03.2015 US 201514643536 (71) Applicant: Armstrong World Industries, Inc. Lancaster, PA 17604-3001 (US)	(72) Inventors: PHAM, Phi-Oanh, R. Lancaster, PA 17601 (US) ROBERTS, Jeffrey, Scott Columbia, PA 17512 (US) (74) Representative: Jenkins, Peter David  Page White & Farrer Bedford House John Street London WC1N 2BF London WC1N 2BF (GB)