Insulated rim board and building structure employing same

Abstract

A three-piece insulated rim board for use in a building structure comprises first and second elongate structural layers and an intermediate elongate insulating layer sandwiched between and bonded to the first and second structural layers.

1 . A three-piece insulated rim board comprising:
 first and second elongate structural layers; and   an intermediate elongate insulating layer sandwiched between and bonded to said first and second structural layers.   
   
   
       2 . An insulated rim board according to  claim 1  wherein said intermediate layer is formed of foam material. 
   
   
       3 . An insulated rim board according to  claim 2  wherein said foam material is one of expanded polystyrene foam, urethane foam, polyurethane foam and isocyanurate foam. 
   
   
       4 . An insulated rim board according to  claim 2  wherein said intermediate layer has a thickness in the range of from about 2½″ to about 7⅜″. 
   
   
       5 . An insulated rim board according to  claim 3  wherein said intermediate layer has a thickness in the range of from about 2½″ to about 7⅜″. 
   
   
       6 . An insulated rim board according to  claim 1  wherein the rim board is symmetrical about vertical and horizontal planes coincident with the central longitudinal axis of the rim board. 
   
   
       7 . An insulated rim board according to  claim 2  wherein the rim board is symmetrical about vertical and horizontal planes coincident with the central longitudinal axis of the rim board. 
   
   
       8 . An insulated rim board according to  claim 7  wherein said foam material is one of expanded polystyrene foam, urethane foam, polyurethane foam and isocyanurate foam. 
   
   
       9 . An insulated rim board according to  claim 7  wherein said intermediate layer has a thickness in the range of from about 2½″ to about 7⅜″. 
   
   
       10 . An insulated rim board according to  claim 1  wherein said first and second structural layers are formed of material selected from plywood, oriented strandboard (OSB), metal sheet or other suitable material. 
   
   
       11 . An insulated rim board according to  claim 10  wherein each of said first and second structural layers has a thickness in the range of from about  1 / 8 ″ to about 1⅛″. 
   
   
       12 . An insulated rim board according to  claim 2  wherein said first and second structural layers are formed of material selected from plywood, oriented strandboard (OSB), metal sheet or other suitable material. 
   
   
       13 . An insulated rim board according to  claim 12  wherein each of said first and second structural layers has a thickness in the range of from about  1 / 8 ″ to about 1⅛″. 
   
   
       14 . An insulated rim board according to  claim 7  wherein said first and second structural layers are formed of material selected from plywood, oriented strandboard (OSB), metal sheet or other suitable material. 
   
   
       15 . An insulated rim board according to  claim 14  wherein each of said first and second structural layers has a thickness in the range of from about ⅛″ to about 1⅛″. 
   
   
       16 . A floor structure for a building structure comprising:
 insulated rim boards running around the perimeter of said building structure and sitting on sill plates; and   joists framed by said rim boards, wherein said insulated rim boards are alterable in vertical dimension without changing the symmetry of the rim boards above the sill plates when looking at the rim boards in side elevation.   
   
   
       17 . A floor structure according to  claim 16  wherein each rim board is of a three-piece construction comprising first and second elongate structural layers and an intermediate elongate insulating layer sandwiched between and bonded to said first and second structural layers. 
   
   
       18 . A floor structure according to  claim 17  wherein the intermediate layer of each rim board is formed of foam material. 
   
   
       19 . A floor structure according to  claim 18  wherein said foam material is one of expanded polystyrene foam, urethane foam, polyurethane foam and isocyanurate foam. 
   
   
       20 . A floor structure according to  claim 19  wherein the intermediate layer of each rim board has a thickness in the range of from about 2½″ to about 7⅜″. 
   
   
       21 . A floor structure according to  claim 17  wherein each rim board is symmetrical about vertical and horizontal planes coincident with the central longitudinal axis of the rim board. 
   
   
       22 . A floor structure according to  claim 17  wherein the first and second structural layers of each rim board are formed of material selected from plywood, oriented strandboard (OSB), metal sheet or other suitable material. 
   
   
       23 . A floor structure according to  claim 22  wherein the first and second structural layers of each rim board have thicknesses in the range of from about ⅛″ to about 1⅛″.