Method for producing glass fiber reinforced plasterboard

A method for producing glass fibre reinforced gypsum boards adapted for use as a wallboard having a uniform isotropic high break resistance comprising a single uniform layer of body material having a generally uniform density, said method including the steps of:

• a) forming a water-gypsum paste by adding water to a solid mixture, said solid mixture comprising gypsum and glass fibre, said glass fibre being added in an amount so as to constitute 0.3-3.0 weight percent of said gypsum board;
• b) adding a microfoam which forms voids in said paste having a diameter of 5-350 microns to said paste and evenly dispersing said foam and said solid mixture in said water-gypsum paste to reduce viscosity and density of said paste, said foam having an apparent density which does not exceed 0.12 g/cm.sup.3, said paste of water, gypsum, glass fibre and foam having a water to solid ratio of 0.4-0.60;
• c) pouring said paste into a form and subjecting said paste to vibrations to spread and shape said paste in said form;
• and
• d) cutting said paste into said gypsum board and subsequently drying said gypsum board.