Abstract: The present invention provides a gypsum-based embedding material composition for casting useful for forming a rapid-heating type gypsum-based embedding material and a method for producing the same. The gypsum-based embedding material is formed of the gypsum-based powdery embedding material composition by adding a malaxation liquid into the composition and heating the mixture in a high-temperature furnace. The gypsum-based embedding material composition contains as main components, at least one co-pulverized material selected from a co-pulverized material of calcined gypsum and quartz, that of calcined gypsum and cristobalite, and that of calcined gypsum, quartz, and cristobalite. The composition further contains a powdery moisture-retaining component or a liquid moisture-retaining component having a low water content, and has an average particle diameter of 30 ?m or less.

Abstract: An insulated tank for storing flammable and combustible liquid comprises an outer containment tank and an inner storage tank that defines a reservoir for storing flammable and combustible liquid. The inner storage tank is received within the outer containment tank such that a space is defined between the walls of the inner storage tank and the walls of the outer containment tank. The space contains one or more perlite boards to insulate the inner tank.

Abstract: A wall panel system includes one or more building blocks, each of the one or more building blocks having a front face made of a first calcium silicate board; a back face made of a second calcium silicate board; and a core positioned between the front face and the back face, the core composed of cement/sand and expandable polystyrene foam; the one or more building blocks are used for building construction. In addition to this will produce panels without calcium silicate board just panels with cement/sand and expandable polystyrene.

Abstract: A method for continuously forming gypsum-based panels of high fixing strength comprises the steps of: • forming a mixture comprising stucco, non-pregelatinized migratory starch, glass fibre, fluidizer and water; • casting the mixture in a continuous band; • maintaining the band under conditions sufficient for the stucco to form an interlocking matrix of set gypsum; • cutting the band to form one or more wet panel precursors; and • drying the wet panel precursor to form one or more gypsum-based panels. • The weight ratio of water to stucco in the mixture is less than 0.7; • the stucco is present in the mixture in an amount of over 60 wt % relative to the total solids content of the mixture; • the starch is present in the mixture in an amount of over 3 wt % relative to the the stucco; • the glass fibre is present in the mixture in an amount of over 1 wt % relative to the stucco; • the fluidizer is is present in the mixture in an amount of at least 0.

Abstract: The present disclosure embraces cementitious panels, and systems and methods of manufacturing cementitious panels. An exemplary cementitious panel includes a cementitious core material, a plurality of sheets of facing material surrounding the cementitious core material, and a radiation-cured adhesive. An exemplary method of manufacturing a cementitious panel includes conveying a slurry of cementitious core material and a plurality of sheets of facing material, applying a radiation-curable adhesive to at least one of the sheets of facing material, forming a continuous length of cementitious panel material, at least partly curing the radiation-curable adhesive with one or more beams of radiation emitting from one or more radiation-emitting devices, and cutting the continuous length of cementitious panel material laterally to a desired length, providing a cementitious panel.

Abstract: A building product in the form of an internal lining board (10) made up of a mixture of hemp shiv (14) and a binder which may be clay based or lime based. The mixture is located between two layers (12) of lining paper (10).

Abstract: This invention provides low dust low density gypsum wallboard products having high total core void volumes, corresponding to low densities in the range of about 10 to 30 pcf. The wallboards have a set gypsum core formed between two substantially parallel cover sheets, the set gypsum core preferably having a total void volume from about 80% to about 92%, and made from a slurry including stucco, pregelatinized starch, and a naphthalenesulfonate dispersant. The combination of the pregelatinized starch and the naphthalenesulfonate dispersant also provides a glue-like effect in binding the set gypsum crystals together. The wallboard formulation, along with small air bubble voids (and water voids) provides dust control during cutting, sawing, routing, snapping, nailing or screwing down, or drilling of the gypsum-containing products.

Abstract: This invention provides gypsum wallboards with a unique microstructure where the walls between voids are enhanced in thickness and strength to substantially improve the strength and handling properties of the wallboards. A method of making lightweight gypsum wallboards is also provided.

Abstract: Disclosed herein are gypsum products with at least one high efficiency heat sink additive. The gypsum products, e.g., gypsum panels, are less susceptible to the damaging effects of extreme heat as the temperature rises due to the presence of the at least one additive.

Abstract: A lightweight cementitious panel formed from a core mix is disclosed. The lightweight cementitious panel comprises one or more lightweight aggregate filler in the amount of 0.5 to 5 weight percent of the core mix, one or more binders in the amount of 35 to 75 weight percent of the core mix, rheological admixture in the amount of about 0.5 to 5 weight percent of the core mix, surfactant in the amount of 0 to 0.1 weight percent of the core mix, one or more normal weight aggregate filler in the amount of 5 to 50 weight percent of the core mix, and water in the amount of 5 to 20 weight percent of the core mix.

Abstract: Composite reinforcement “Astrofleks” is used in building structures for reinforcement of insulation wall panels, solid concrete and prefabricated buildings. The composite reinforcement comprises the outer layer (1), inside of which the inner layer (2) is placed, on the outer surface of outer layer (1) there are relief elements (3) to improve adhesion of nanocomposite reinforcement with concrete. According to embodiment number 1, layer (1) is made of nanocomposite carbon in which the polymer matrix is modified by carbon nanostructures. Layer (2) is made of lightweight highly mobile concrete, containing in its composition components in the following ratio (% wt.): Cement—20-50; filler—70-30; plasticizer—0.02-2.5; water—the rest. According to embodiment number 2, layer (1) is made of nanocomposite carbon in which the polymer matrix is modified by polyhedral multi-layered carbon nanostructures of fulleroid type at a ratio of 0.01-10% by weight of the polymer matrix.

Abstract: A self-confining structural article includes a ceramic matrix with a reinforcement member disposed within the ceramic matrix. The reinforcement member is continuous, and has a mesh with holes not exceeding 4 mm in size.

Abstract: The ceiling tile, in one embodiment of the invention, is a laminate of a rigid core layer, such as gypsum, having one surface covered by a display layer of plastic sheet material. An opposite surface of the core layer is covered by a layer of light reflective material. The design layer has a design surface that is viewable when the tile is installed in a ceiling, and the light reflective layer has an exposed light reflective surface. Both the design layer and the light reflective layer form leak tight seals on the opposite surfaces of the rigid core layer. The entire peripheral edge of the tile laminate and marginal portions of the design surface and light reflective surface are covered by a plastic leak tight tape that forms a gas tight seal at the peripheral edge of the tile laminate.

Abstract: A composite product includes gypsum in an amount of 60 to 90% by weight, fibers in an amount of 1.5 to 26% by weight substantially homogeneously distributed through the composite, and a rheology-modifying agent in an amount of 0.5 to 6% by weight. The composite is caused or allowed to cure to form a cured composite. The cured composite is a fire resistant component used in a fire-rated door core, a fire-rated door or a fire-rated building panel. The fire resistant component may include a building panel, a door panel, a door core, a door rail, a door stile, a door lock block, a door border, or a door insert.

Abstract: A modular construction system for quick and convenient construction of buildings, comprising construction panels generally in the order of 600 m wide. The modular construction system includes construction panels, framed construction panels, lintel panels, and framed lintel panels, that together allow a wide variety of building configurations to be assembled. The construction panel includes a cast cement wall member and partially embedded channel shaped sheet steel support members, with the wall member defining an extended portion that extends from the support member to the edge of a major face of the wall member. The framed construction panels is 600 mm wide and includes shaped sheet steel support members extending from a major face at least partially around its periphery.

Abstract: The ceiling tile, in one embodiment of the invention, is a laminate of a rigid core layer, such as gypsum, having one surface covered by a display layer of plastic sheet material. An opposite surface of the core layer is covered by a layer of light reflective material. The design layer has a design surface that is viewable when the tile is installed in a ceiling, and the light reflective layer has an exposed light reflective surface. Both the design layer and the light reflective layer form leak tight seals on the opposite surfaces of the rigid core layer. The entire peripheral edge of the tile laminate and marginal portions of the design surface and light reflective surface are covered by a plastic leak tight tape that forms a gas tight seal at the peripheral edge of the tile laminate.

Abstract: A presence detection system for detecting presence of a living being (2) within an area (4), the system comprising a first light source (6a) providing light of a first spectrum, a first sensing means (8a; 10a) which is arranged to filter the light of the first spectrum. The first sensing means produces a first presence detection signal (12a) based on the light of the first spectrum originated from the first light source and reflected from the living being (2). The presence detection system comprises a processor device (14) for concluding the living being's presence within the area (4) based on the first presence detection signal (12a). The processor device provides a position (22a) of the living being (2) within the area based on the intensity of the first presence detection signal (12a) and based on the known position of the first light source (6a) within the area (4). The invention further relates to a lighting system comprising the above described presence detection system.

Abstract: A reinforcement mesh, an architectural moulding reinforced by the mesh, and methods of making the architectural moulding and the mesh. The mesh is adhered by an adhesive to the architectural moulding. In the mesh, weft yarns bend relative to warp yarns to conform to and against a curved profile of the architectural moulding, and the warp yarns are unbent and adhered against the moulding.

Abstract: A knitted spacer fabric has a tightly knitted bottom layer, a more loosely knitted upper layer and linking fibers extending across the space between the lower and upper faces. Settable material, e.g. cement, is introduced into the space between the upper and lower faces and can be caused to set by the addition of a liquid, e.g. water. Until set, the fabric is flexible and can be shaped but after the material in space has set, the fabric is rigid and can be used as a structural element in a wide range of situations. The bottom layer has an extension that extends beyond the upper face and is connected to the upper face by elastic connecting fibers that draw the extension towards the other face, thereby at least partly closing the space at the edge of the cloth and preventing the settable material from spilling out.

Abstract: Building boards and method for manufacturing the same are provided. The building board comprises a cement layer (102) and a magnesium oxide layer (104). The method for manufacturing the building board comprises the steps of providing a cement board and a magnesium oxide board, dehydrating and binding the cement board and the magnesium oxide board. The performance of moisture proofing, fungus proofing, erode proofing, fireproof and others can be improved by utilizing the building boards.

Abstract: Disclosed herein are gypsum products with at least one high efficiency heat sink additive. The gypsum products, e.g., gypsum panels, are less susceptible to the damaging effects of extreme heat as the temperature rises due to the presence of the at least one additive.

Abstract: A knitted spacer fabric has a tightly knitted bottom layer, a more loosely knitted upper layer and linking fibres extending across the space between the lower and upper faces. Settable material, e.g. cement, is introduced into the space between the upper and lower faces and can be caused to set by the addition of a liquid, e.g. water. Until set, the fabric is flexible and can be shaped but after the material in space has set, the fabric is rigid and can be used as a structural element in a wide range of situations. The bottom layer has an extension that extends beyond the upper face and is connected to the upper face by elastic connecting fibres that draw the extension towards the other face, thereby at least partly closing the space at the edge of the cloth and preventing the settable material from spilling out.

Abstract: A knitted spacer fabric having a tightly knitted bottom layer, a more loosely knitted upper layer and linking fibres extending across the space between the lower and upper faces. Settable material, e.g. cement, is introduced into the space between the upper and lower faces and can be caused to set by the addition of a liquid, e.g. water. Until set, the fabric is flexible and can be shaped but after the material in space has set, the fabric is rigid and can be used as a structural element in a wide range of situations. The bottom layer has an extension that extends beyond the upper face and is connected to the upper face by elastic connecting fibres that draw the extension towards the other face, thereby at least partly closing the space at the edge of the cloth and preventing the settable material from spilling out.

Abstract: The ceiling tile, in one embodiment of the invention, is a laminate of a rigid core layer, such as gypsum, having one surface covered by a display layer of plastic sheet material. An opposite surface of the core layer is covered by a layer of light reflective material. The design layer has a design surface that is viewable when the tile is installed in a ceiling, and the light reflective layer has an exposed light reflective surface. Both the design layer and the light reflective layer form leak tight seals on the opposite surfaces of the rigid core layer. The entire peripheral edge of the tile laminate and marginal portions of the design surface and light reflective surface are covered by a plastic leak tight tape that forms a gas tight seal at the peripheral edge of the tile laminate.

Abstract: A previously formed unitary building exterior envelope product is provided, comprising: a mineral fiber insulation board including a binder having a hydrophobic agent and is resistant to liquid water-penetration and has first and second major surfaces, an exterior facing material, which resists air infiltration and liquid water penetration, laminated to the first major surface, the exterior facing material being permeable to water vapor, and a continuous interior facing laminated to the second major surface, so that the second major surface is resistant to liquid water-penetration and is permeable to water vapor. The section of product is mounted to an exterior side of a plurality of framing members of an exterior wall of a building, so that the interior facing faces the framing members. An exterior layer is mounted to the framing members using a connection device that passes through the section of product, with the facing material facing the exterior layer.

Abstract: Composite reinforcement “Astrofleks” is used in building structures for reinforcement of insulation wall panels, solid concrete and prefabricated buildings. The composite reinforcement comprises the outer layer (1), inside of which the inner layer (2) is placed, on the outer surface of outer layer (1) there are relief elements (3) to improve adhesion of nanocomposite reinforcement with concrete. According to embodiment number 1, layer (1) is made of nanocomposite carbon in which the polymer matrix is modified by carbon nanostructures. Layer (2) is made of lightweight highly mobile concrete, containing in its composition components in the following ratio (% wt.): Cement—20-50; filler—70-30; plasticizer—0.02-2.5; water—the rest. According to embodiment number 2, layer (1) is made of nanocomposite carbon in which the polymer matrix is modified by polyhedral multi-layered carbon nanostructures of fulleroid type at a ratio of 0.01-10% by weight of the polymer matrix.

Abstract: A flexible composite multiple layer fire-resistant insulation structure has a primary facing surface and a secondary facing surface. There is at least one dimensionally stable membrane having a primary membrane surface and a secondary membrane surface. At least a portion of the secondary facing surface is attached to the primary membrane surface. There is also at least one lofted insulative layer having a primary insulative surface and a secondary insulative surface. The at least one woven fabric facing layer may be formed of various materials, including amorphous silica glass and S-glass fiberglass. Different weaving patterns may be used to weave the facing layer. The facing layer may include a fire resistive treatment, which may in turn include a phosphate containing compound, and more particularly, may include dicalcium phosphate. In certain embodiments, multiple layers of the above are provided, and the structure may be enclosed in an abrasion resisting sheath.

Abstract: A construction board is formed from a composition comprising one or more of the following ingredients: magnesium oxide, magnesium chloride, a binding agent (e.g., perlite), wood shavings, recycled board scraps, and water. The construction board further includes fiberglass and polyester paper sheets on opposite sides of the construction board. A method of fabricating the construction board is also disclosed to include mixing magnesium chloride with water to form a solution, mixing the solution with magnesium oxide, perlite and a binding agent to form a paste, and pouring the paste onto a mold to form a construction board. The paste is poured onto a mold which is then passed through a series of rollers to spread out the paste evenly across the mold and to form the paste into the desired thickness. The resulting construction board is fire and water resistant and much more durable than conventional sheetrock.

Abstract: The present invention describes a fire resistant building material composition, useful for example as a fire door core and to a method of making this composition where the building material of the present invention is prepared from an aqueous slurry of calcined gypsum, paper fibers, a water insoluble organic binder, fiber reinforcement and a set retarder.

Abstract: A method for creating a three-dimensional solid freeform fabrication object includes spreading a reactive powder on a substrate, selectively dispensing a core binder in the reactive powder to form a core material, and selectively dispensing a shell binder in the reactive powder to form a shell on the core material.

Abstract: Sheathing panels are produced by methods which do not require natural resources such as wood and use significantly reduced embodied energy when compared with the energy used to fabricate gypsum sheathing panels. A novel binder, consisting in one embodiment of monopotassium phosphate and magnesium oxide, and combined with various fillers, is incorporated with hollow tubes or water soluble fibers to create a gypsum board-like core which can be formed into a suitable sheathing panel handled and installed in a typical manner. The panel is manufactured to have a desirable shear resistance and water vapor permeability, important performance elements in building envelope design. The manufacturing process results in a panel that does not require mature trees as source material, does not off gas, and involves much lower greenhouse gas emissions than the processes used to make traditional wood or gypsum-based sheathing panels.

Abstract: A PZT (lead zirconate titanate) element including one or more outside surfaces including a layer of encapsulation and metallization material and the method of making the same including at least the steps of providing a wafer of ceramic material including a base and one or more walls defining one or more recesses in the wafer which are filled with an encapsulation material. The encapsulation material is then cured and a layer of metallization is applied to one or more of the outside surfaces of the wafer and encapsulation material. Cuts are then made through the layer of metallization and cured encapsulation material to divide the wafer into a plurality of individual and separate ceramic elements with one or more surfaces including a layer of metallization and encapsulation.

Abstract: A construction board is formed from a composition comprising one or more of the following ingredients: magnesium oxide, magnesium chloride, a binding agent (e.g., perlite), wood shavings, recycled board scraps, and water. The construction board further includes fiberglass and polyester paper sheets on opposite sides of the construction board. A method of fabricating the construction board is also disclosed to include mixing magnesium chloride with water to form a solution, mixing the solution with magnesium oxide, perlite and a binding agent to form a paste, and pouring the paste onto a mold to form a construction board. The paste is poured onto a mold which is then passed through a series of rollers to spread out the paste evenly across the mold and to form the paste into the desired thickness. The resulting construction board is fire and water resistant and much more durable than conventional Sheetrock® brand plaster wallboard.

Abstract: A method of continuously forming a multilayer panel includes making a gypsum slurry, then dividing the gypsum slurry into at least a primary gypsum slurry and a secondary gypsum slurry. An additive slurry having water and an intumescent material is created, then added to the secondary gypsum slurry to make an expandable layer slurry that is spread over at least a portion of a facing material. The primary gypsum slurry is distributed over the secondary gypsum slurry over the facing material and the expanding layer slurry to form a core. Optionally, another layer, an edge coating, is applied to the expanding layer for additional fire protection. The edge coating includes a second intumescent material. During a fire, the expanding layer expands to increase the thickness of the fire exposed gypsum panel and the edge coating expands to seal the gap between adjoining gypsum panels.

Abstract: Sheathing panels are produced by methods which do not require natural resources such as wood and use significantly reduced embodied energy when compared with the energy used to fabricate gypsum sheathing panels. A novel binder, consisting in one embodiment of monopotassium phosphate and magnesium oxide, and combined with various fillers, is incorporated with hollow tubes or water soluble fibers to create a gypsum board-like core which can be formed into a suitable sheathing panel handled and installed in a typical manner. The panel is manufactured to have a desirable shear resistance and water vapor permeability, important performance elements in building envelope design. The manufacturing process results in a panel that does not require mature trees as source material, does not off gas, and involves much lower greenhouse gas emissions than the processes used to make traditional wood or gypsum-based sheathing panels.

Abstract: A lightweight masonry compound (027) including the wrapping or protector cover (024, 025), said compound in a band form with particular dimensions in thickness, width and length; ready to use on site without the need of any equipment or tools; preferably having bonding strength and compressive strength equivalent or better than standard conventional mortar or dry premix or wet premix; capable of bonding masonry products.

Abstract: A construction board is formed from a composition comprising one or more of the following ingredients: magnesium oxide, magnesium chloride, a binding agent (e.g., perlite), wood shavings, recycled board scraps, and water. The construction board further includes fiberglass and polyester paper sheets on opposite sides of the construction board. A method of fabricating the construction board is also disclosed to include mixing magnesium chloride with water to form a solution, mixing the solution with magnesium oxide, perlite and a binding agent to form a paste, and pouring the paste onto a mold to form a construction board. The paste is poured onto a mold which is then passed through a series of rollers to spread out the paste evenly across the mold and to form the paste into the desired thickness. The resulting construction board is fire and water resistant and much more durable than conventional sheetrock.

Abstract: A gypsum board having roughened surface glass fiber reinforcement. The roughened surface of glass fiber is created by incorporating nano or micro particles of colloidal silica or clay or other inorganic particles in a silane based sizing composition. The sizing coating is partially or completely cured and incorporated in gypsum wet mix either as additions of chopped fibers or as placement of roughened surface glass fiber mats at selected locations within a cast gypsum sheet. The roughened surface of glass fiber with nano or micro particles compliantly bonded with silane polymer transfers load from gypsum to glass fibers providing improved strength and flexure resistance of gypsum boards.

Abstract: A laminar mat comprises a rigid planar tile of moulded plastics material having on respective faces a planar layer integrated therewith during moulding of the tile, the planar layers each being of similar material. Non-adhesive integration of the planar layers during moulding eliminates the need for adhesive. The mat may be moulded so as to include one or more projections, recesses and living hinges.

Abstract: A heat shield suitable for motor vehicles and a method for manufacturing the heat shield is provided. The heat shield is intended to protect temperature-sensitive assemblies, components and connection lines from the direct impact of heat radiation and, possibly, acts as insulation. Moreover, the heat shield may also provide advantageous soundproofing properties. The heat shield is comprised of first and second plates that are at least partially deformable and an insulating material positioned between said plates. Preferably, at least a portion of said insulating material is in the form of compacted powder or flakes.

Abstract: The microporous heat insulation body consists of a compressed heat insulation material containing from 30 to 90% by weight of a finely divided metal oxide, from 0 to 30% by weight of an opacifier, from 0 to 10% by weight of an inorganic fibrous material, and from 0 to 15% by weight of an inorganic binder, and additionally from 2 to 45% by weight, preferably from 5 to 15% by weight of xonotlite.

Abstract: The present invention provides a reinforced article with an injected inner reinforcing mixture layer deposited between a covering material and a core material.

Abstract: A mold-resistant gypsum panel includes a core of an interlocking matrix of calcium sulfate dihydrate crystals, a facing material on at least one side of the panel and a salt of pyrithione dispersed through both the core and the facing materials. A method of making a mold-resistant gypsum product is also provided. A slurry of calcined gypsum, water and a water-soluble pyrithione salt is formed, then deposited on a sheet of facing material. The slurry on the facing material is shaped into a panel and maintained under conditions sufficient for the calcined gypsum to react with the water to form a core comprising an interlocking matrix of set gypsum crystals. Heating of the panel causes evaporation of the water that did not react with the calcined gypsum.

Abstract: The microporus heat insulation body consists of a core of a compressed heat insulation material containing from 30 to 90% by weight of a finely divided metal oxide and further additives, wherein one or both surfaces thereof have a cover of a heat-resistant material and where the covers are the same or different and at least one side consists of prefabricated mica sheets.

Abstract: A composition including, but not limited to, a mixture of a calcium sulfate material, water, and a tetrametaphosphate compound is disclosed. Desirably, the inclusion of the tetrametaphosphate compound (e.g., salt or ion) in a pre-set treatment of a calcium sulfate material enhances the resistance to permanent deformation (e.g., sag), dimensional stability, and/or compressive strength of the composition while also preferably avoiding any significant retardive effect on the rate of hydration of calcined gypsum to calcium sulfate dihydrate. A set gypsum-containing product and a method for producing a set gypsum-containing product having increased resistance to permanent deformation are also disclosed.

Abstract: An apparatus and method for applying reference or grid markings to wallboard during the manufacturing process is disclosed. Reference or grid markings are applied to one sheet of cover paper at a location between the originating cover paper rolls and the cover paper creaser or creasers. This is accomplished by locating and aligning multiple print heads across the width of the continuously passing cover paper, such that markings are ejected onto the cover paper in a specific and coordinated fashion. In addition to using any suitable commercially-available computer equipment to coordinate printer head activity, this function is accomplished by attaching each print head to a common horizontal support element and provide individual adjustments that are perpendicular to, and with the directional flow of the passing cover paper.

Abstract: A novel gypsum board having antifungal properties is disclosed. The board comprises a gypsum core, front and back paper facings and an antifungal agent effective at inhibiting fungal growth. A preferred antifungal agent is cetyl pyridinium chloride. The antifungal agent can be present in the gypsum core and/or on one or both of the paper facings. In addition, the antifungal agent may be encapsulated in a material that releases the antifungal agent over time and/or upon exposure to moisture. Also disclosed are methods for preparing the aforementioned antifungal gypsum board.

Abstract: A gypsum wallboard that exhibits antimicrobial characteristics is disclosed. A method for making the wallboard is also disclosed. Suitable antimicrobial agents that may be applied to the wallboard or any components thereof include propiconazole, sodium pyrithione, tolyl diiodomethyl sulfone; tebuconazole; thiabendazole; 3-iodo-2-propynyl butylcarbamate; and mixtures thereof.

Abstract: A resin mixture for forming a stable closed cell foam contains a phenolic resole, a chain extending agent, and as curing agents, a base, and an ester and/or an aliphatic carbonate. The chain extending agent is especially an epoxy resin and/or a phenolic novalak resin.

Abstract: A method is provided for continuous production of gypsum boards which comprises forming a laminate of gypsum slurry between a facing paper and a backing paper and continuously forming a longitudinal recess along the side edges of the laminate surface, and a lateral recess at spaced intervals on the laminate surface thereby producing a four-tapered edge gypsum board which is uniquely suitable as a material of construction in the building industry.