(19)

(11)

EP 3 371 388 A1

(12)

(43) Date of publication: 12.09.2018 Bulletin 2018/37 (21) Application number: 16864799.8 (22) Date of filing: 04.11.2016

(51) International Patent Classification (IPC):  E04B 9/00(2006.01) E04B 9/12(2006.01) E04B 9/30(2006.01) E04B 9/04(2006.01) (86) International application number: PCT/US2016/060438 (87) International publication number: WO 2017/083181 (18.05.2017 Gazette 2017/20)

(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: 09.11.2015 US 201514935551 09.11.2015 US 201514935562 (71) Applicant: Armstrong World Industries, Inc. Lancaster, PA 17604-3001 (US)	(72) Inventor: BERGMAN, Todd M. Lititz, Pennsylvania 17543 (US) (74) Representative: Jenkins, Peter David  Page White & Farrer Bedford House John Street London WC1N 2BF London WC1N 2BF (GB)