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Vibration and Earthquake Isolation

Prefabricated-composite-building-panel-with-improved-fire-retardancy

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Prefabricated composite building panel with improved fire retardancy

Details

Inventors: Hesterman, Larry C.; Holzkaemper, Rolf C.;
Assignee: Pan-Brick, Inc. (Saskatchewan, CA)
Primary Examiner: Safavi; Michael
Assistant Examiner:
Attorney, Agent or Firm: Sterne, Kessler, Goldstein & Fox P.L.L.C.

A prefabricated composite panel of the type comprising a supporting plywood board, a foamed sheet of polyurethane and a covering layer on the front face of the polyurethane comprising a plurality of brick slices with an aggregate in the spaces between the brick slices which is bonded into the front face of the foam is improved in its fire retardancy by providing a plurality of vertical support metal strips on the inside face of the brick slices at spaced positions across the width of the panel. Each metal strip includes a hanger element at the top which engages over a portion of the foam and a plurality of punched tabs each of which engages under a respective one of the brick slices. The support strips prevent sagging of the brick slices when heat is applied to the front face of the panel since that sagging can allow the heat to penetrate cracks in the covering aggregate. The fire retardancy is further improved by the addition of gypsum to the aggregate which reduces the temperature by releasing water molecules. A yet further improvement provides a reinforcing element in the form of expanded metal embedded in the foam sheet behind those ones of the brick slices which project outwardly at the sides beyond the end of the board.

DETAILED DESCRIPTION According to one aspect of the invention there is provided a prefabricated composite building panel for attachment to a vertical wall of a building comprising a rigid sheet of cellular polymeric material having an outer face for facing outwardly of the wall and an inner face for facing inwardly of the wall, a plurality of rigid facing elements embedded to the outer face of the sheet so as to define an outermost surface of the panel, the facing elements being attached to the outer face in a pattern defining spaces between at least some of the facing elements and adjacent ones of the facing elements, a covering layer on the outer face of the sheet in the spaces and mechanical support means engaging the sheet and formed from a rigid material different from the cellular polymeric material and engaging a plurality of the facing elements to provide mechanical support of the facing elements to resist downward sagging of the facing elements on the sheet.
According to a second aspect of the invention there is provided a prefabricated composite building panel for attachment to a vertical wall of a building comprising a rigid sheet of cellular polymeric material having an outer face for facing outwardly of the wall and an inner face for facing inwardly of the wall, a plurality of rigid facing elements bonded to the outer face of the sheet so as to define an outer most surface of the panel, the facing elements being attached to the outer face in a pattern defining spaces between at least some of the facing elements and adjacent ones of the facing elements, and a covering layer on the outer face of the sheet in the spaces wherein the covering layer is formed from an aggregate monolithically foamed into the outer face, the aggregate including a weather resistant particulate material and gypsum.
It has been found surprisingly that the mechanical support of the facing elements prevents the sag of those elements which can otherwise occur on application of heat to the outside surface of the panel

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