US 11,865,820 B2
Reinforcing layer, a cementitious board, and method of forming the cementitious board
Nancy E. Brown, New Braintree, MA (US); Matthew S. Goldhawk, Amherst, NY (US); Zhenpeng Li, Pitney Flats, TN (US); and Olivier Rosseler, Arlington, MA (US)
Assigned to SAINT-GOBAIN ADFORS CANADA, LTD., Grand Island, NY (US)
Filed by SAINT-GOBAIN ADFORS CANADA, LTD., Grand Island, NY (US)
Filed on Dec. 18, 2018, as Appl. No. 16/223,721.
Claims priority of provisional application 62/607,794, filed on Dec. 19, 2017.
Prior Publication US 2019/0193381 A1, Jun. 27, 2019
Int. Cl. B32B 27/12 (2006.01); B32B 37/15 (2006.01); B32B 13/14 (2006.01)
CPC B32B 27/12 (2013.01) [B32B 13/14 (2013.01); B32B 37/15 (2013.01); B32B 2307/7246 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A reinforcing layer for a cementitious board comprising an alkali-resistant fabric, a non-porous membrane, and a first non-woven mat, wherein the alkali-resistant fabric comprises a glass fabric laid scrim, wherein the first non-woven mat is directly in contact with the non-porous membrane and the alkali-resistant fabric and wherein the non-porous membrane comprises a polymeric film having a filler content of less than 5 weight % based on the total weight of the polymeric film, the non-porous membrane having a thickness of less than 5 mils, wherein the non-porous membrane has a breaking strength of greater than 170 psi as measured by ASTM D751.