Facing material with controlled porosity for construction...

B - Operations – Transporting – 32 – B

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B32B 13/14 (2006.01) B32B 13/02 (2006.01) B32B 17/02 (2006.01) D03D 15/02 (2006.01) D03D 15/12 (2006.01) E04C 2/04 (2006.01)

Patent

CA 2513508

A cementitious board (100) and a method for manufacturing the cementitious board (100) has a facing layer (105) having an areal weight of about 300 grams/M2, and an air permeability rating of no greater than about 300 CFM/ft2 (FG 436-910 test method). The facing layer (105) reduces the penetration of a slurry (28) of cementitious material during the manufacture of the board (100), and passes water vapor from the slurry (28) while the slurry (28) cures. Binders, coatings or saturants (107) decrease pore size, increase or decrease the contact angle of liquids, promote adhesion to cementitious cores (101), promote adhesion to the facing layer (105) and promote adhesion or affinity to adhesive compositions used to join cementitious boards to exterior insulation systems and exterior finishing systems (EIS and EIFS).

L'invention concerne un panneau en agglomérés (100) et un procédé de fabrication d'un tel panneau. Le panneau en agglomérés (100) présente une couche de surface (105) présentant une masse surfacique d'environ 300 grammes/M?2¿, et un taux de perméabilité à l'air inférieur ou égal à environ 300 CFM/ft?2¿ (selon méthode d'essai FG 436-910). La couche de surface (105) réduit la pénétration d'une bouillie (28) d'un matériau en agglomérés durant la fabrication du panneau (100), et laisse passer la vapeur d'eau provenant de la bouillie (28) pendant que la bouillie durcit. Des liants, des revêtements et des agents de saturation (107) diminuent les dimensions des pores, augmentent ou diminuent l'angle de contact des liquides, favorisent l'adhérence aux noyaux d'agglomérés (101), favorisent l'adhérence à la couche de surface (105) et favorisent l'adhérence ou l'affinité aux compositions adhésives utilisées pour la jonction des panneaux d'agglomérés aux systèmes d'isolation extérieurs et aux systèmes de finissage extérieurs (EIS et EIFS).

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