Multilayered structural insulated panel

Abstract

A structural insulated panel includes an internal foam (EPS) core, oriented strand board (OSB) faces on the core, and a sheet of magnesium oxide (MagOx) on one or both of the faces for environmental purposes of either weather resistance and/or fire protection. The outer faces incorporate interior and exterior surfaces that need little more than a finish top coat paint. The combination of core, oriented strand board, and outer sheets provide a thermally efficient insulating structure that is a fully nationally code approved building structure.

1 . A structural insulated panel (SIP) comprising:
 an internal foam (EPS) core, oriented strand board (OSB) structural faces on the core, and at least one sheet of non-cementous, fire retardant material on one of the faces.   
   
   
       2 . The panel defined in  claim 1 , wherein the at least one sheet of fire retardant material is attached to the oriented strand board with an adhesive that adds to the fire retardancy of the facing. 
   
   
       3 . The panel defined in  claim 2 , wherein the at least one sheet of fire retardant material is on the inside only. 
   
   
       4 . The panel defined in  claim 1 , where the sheet is made of magnesium oxide, gypsum composite, cellulose impregnated with ammonium phosphate or with amnonimun phosphate, or cellulose impregnated with phenolic. 
   
   
       5 . The panel defined in  claim 2 , wherein the at least one sheet of fire retardant material is on the inside and outside faces. 
   
   
       6 . The panel defined in  claim 5 , wherein each of the core, structural faces and at least one sheet add to the structural integrity of the panel. 
   
   
       7 . The panel defined in  claim 5 , wherein the panel is at least about 8 feet by 24 feet. 
   
   
       8 . The panel defined in  claim 1 , wherein the at least one sheet of fire retardant material includes sheets on the inside and outside faces. 
   
   
       9 . The panel defined in  claim 1 , wherein the panel is at least about 8 feet by 24 feet. 
   
   
       10 . The panel defined in  claim 1 , wherein the internal foam (EPS) core is at least about 3½ inches thick, and the oriented strand board (OSB) faces are about ⅜ inch to 1 inch thick, and the at least one sheet of fire retardant material is at most about 5 mm thick. 
   
   
       11 . The panel defined in  claim 10 , wherein the oriented strand board (OSB) faces are about ⅜ inch to ¾ inch thick, and the at least one fire retardant sheet is at most about 3 mm thick. 
   
   
       12 . A method comprising steps of:
 providing a foam core with oriented strand board faces; and   applying a thin layer of fire retardant sheet over the faces.   
   
   
       13 . A structural insulated panel comprising:
 a structural insulated panel (SIP); and   at least one thin layer of fire retardant material on at least one of the faces of the structural insulated panel.