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An insulating board is formed of a low density insulating material, such as polystyrene foam. The board has apertures therein and a plurality of slots on its upper and its lower surfaces, the slots in the lower surface being offset from those in the upper surface. A high density material, such as gy

An insulating board is formed of a low density insulating material, such as polystyrene foam. The board has apertures therein and a plurality of slots on its upper and its lower surfaces, the slots in the lower surface being offset from those in the upper surface. A high density material, such as gypsum or artificial resin or a cement fills the apertures and slots and extends over the upper and the lower surfaces of the board and, if desired, over it edges to form a composite sheet. Sheets of paper, plastic or metal may be fixed to the top and to the bottom of the composite sheet. A tile may be provided by affixing a planar sheet or the like to the top side of the composite sheet, the planar sheet, when in place, conforming to the upper surface of the composite sheet. A method of making the sheet involves bringing the board of low density material into contact with the material of higher density and allowing it to set or cure. The method of producing the composite sheet involves filling the apertures and slots on the insulating board with the high density material so as to cover at least one of the upper or lower surface thereof. The depth of the slots are at least slightly greater than the thickness of the board. Some or all of the apertures are defined by intersections between slots in the upper and lower surfaces of the board.

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An article comprising an insulating board having a plurality of apertures therein, said board being formed of low density material and having an upper surface and a lower surface, said upper surface having a first plurality of slots therein defining a plurality of areas of reduced thickness separate

An article comprising an insulating board having a plurality of apertures therein, said board being formed of low density material and having an upper surface and a lower surface, said upper surface having a first plurality of slots therein defining a plurality of areas of reduced thickness separated by areas of at least a given thickness greater than said said reduced thickness, at least some of said apertures being coincident with at least some of said slots, and a second plurality of slots in said lower surface, wherein said board has a given thickness, wherein said slots have depths at least slightly greater than one-half said given thickness and wherein at least some of said apertures are defined by intersections between slots of said first and said second pluralities of slots.