Cementitious boards with reinforced edges that resist impact...

E - Fixed Constructions – 04 – C

Patent

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E04C 2/04 (2006.01) E04C 2/38 (2006.01)

Patent

CA 2710834

A cementitious board reinforced on its edges by a coating of an elastic composition that provides improved nail pull strength to the board. In a preferred em-bodiment, the coating provides additional protection of the edges of the board from impact damage and cracking or 'spalling' of the board during handling and installation e.g. nailing, particularly when the board is nailed to a structure near the edges of the cementitious board. The cementitious board typically include gypsum fiberboard, paper covered gypsum wallboard and cement board having a core layer of a lightweight cement composition. On the edges of the board, the coating is applied to cover the portion of the board from the edge to a distance of about 0.635 cm. to 5.08 cm. (one fourth inch to two inch) typically 0.635 cm. to 2.54 cm. (one fourth inch to one inch) from each of the edges on both the top and bottom outer surface layers of the cementitious board to form rounded edges.

Panneau cimentaire à bords renforcés par un revêtement d'une composition élastique qui assure au panneau une résistance améliorée à l'arrachement de clous. Selon un mode de réalisation préféré, le revêtement assure une protection supplémentaire des bords du panneau contre les dommages provoqués par des impacts et la fissuration ou « l'éclatement » du panneau pendant la manipulation et l'installation, par exemple pendant le clouage, en particulier quand le panneau est cloué à une structure près des bords du panneau cimentaire. Le panneau cimentaire comprend typiquement un panneau de fibres de gypse, un panneau de revêtement en gypse recouvert de papier, et un panneau de ciment ayant une couche formant âme faite d'une composition de ciment léger. Sur les bords du panneau, le revêtement est appliqué de sorte à recouvrir la partie du panneau s'étendant à partir du bord sur une distance d'environ 0,635 cm à 5,08 cm (un quart-de-pouce à deux pouces), typiquement de 0,635 cm à 2,54 cm (un quart-de-pouce à un pouce), depuis chacun des bords sur les deux couches de surface externe, supérieure et inférieure, du panneau cimentaire, pour former des bords arrondis.

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