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Production of building board

  • US 4,378,405 A
  • Filed: 09/17/1981
  • Issued: 03/29/1983
  • Est. Priority Date: 05/30/1979
  • Status: Expired due to Term
First Claim
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1. A method for making a building board having a pervious fabric embedded in at least one face thereof, said method consisting essentially of advancing a first support surface and a second support surface in converging relationship to each other, applying a layer of a pervious fabric to at least one of the support surfaces, depositing an aqueous slurry of cementitious material such as gypsum plaster between the advancing support surfaces and vibrating the support surface in contact with the fabric until the slurry penetrates through the fabric.

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