Building party wall assembly

Abstract

The building party wall assembly comprises a first structural insulated panel and a second structural insulated panel separated by an air gap. The first structural insulated panel comprises a rigid foam insulation core, a first cementitious board disposed on one side of the core, and a second cementitious board disposed on the second side of the core. The second structural insulated panel comprises a rigid foam insulation core, a third double thick cementitious board disposed on one side of the core, and a third double thick cementitious board disposed on the other side of the core. Alternatively, the second structural insulated panel comprises two first cementitious boards stacked on top of each other disposed on one side of the core, and two second cementitious boards stacked on top of each other disposed on the other side of the core.

1 . A building party wall assembly that reduces sound transmission and is fire resistant comprising:
 a first structural insulated panel assembly;   a second structural insulated panel assembly; and   an air gap separating the first and second structural panel assemblies;   the first structural insulated panel assembly comprising:
 a first insulation core having a first side and a second side; 
 a first cementitious board having a first thickness disposed on the first side of the first insulation core; 
 a second cementitious board having the first thickness disposed on the second side of the first insulation core; 
   the second structural insulated panel assembly comprising:
 a second insulation core having a first side and a second side opposite the first side; 
 a third cementitious board having a second thickness comprising at least one major surface, the third cementitious board disposed on the first side of the second insulation core; 
 a fourth cementitious board comprising at least one major surface, the fourth cementitious board having the second thickness disposed on the second side of the second insulation core, 
 the second thickness being at least twice the thickness of the first thickness. 
   
     
     
         2 . The building party wall assembly of  claim 1 , wherein the second thickness is approximately twice the thickness of the first thickness. 
     
     
         3 . The building party wall assembly of  claim 1 , at least one of the cementitious boards comprising Sorel cement board. 
     
     
         4 . The building party wall assembly of  claim 1 , wherein the first thickness is approximately one half inch. 
     
     
         5 . The building party wall assembly of  claim 1 , each of the first and second insulation cores comprising rigid foam insulation. 
     
     
         6 . The building party wall assembly of  claim 5 , each of the first and second rigid foam insulation cores comprising EPS foam. 
     
     
         7 . The building party wall assembly of  claim 1 , wherein each of the first and second rigid foam insulation cores is approximately 3⅝ inches thick. 
     
     
         8 . The building party wall assembly of  claim 1 , wherein the air gap is an approximately two-inch air gap. 
     
     
         9 . The building party wall assembly of  claim 1 , further comprising a plurality of nominal 2×4 inch pieces of lumber disposed at the edges of each structural insulated panel assembly thereby forming a frame. 
     
     
         10 . The building party wall assembly of  claim 1 , each cementitious board comprising a Sorel cement board reinforced with a fibrous layer on two major surfaces of the Sorel cement board. 
     
     
         11 . The building party wall of  claim 10 , the fibrous layer comprising a fiberglass mesh. 
     
     
         12 . The building party wall of  claim 1 , wherein none of the cementitious boards comprise gypsum. 
     
     
         13 . A building party wall assembly that reduces sound transmission and is fire resistant comprising:
 a first structural insulated panel assembly;   a second structural insulated panel assembly; and   an air gap separating the first and second structural panel assemblies;   the first structural insulated panel assembly comprising:
 a first insulation core having a first side and a second side opposite the first side; 
 a first cementitious board disposed on the first side of the first insulation core; 
 a second cementitious board disposed on the second side of the first insulation core; 
   the second structural insulated panel assembly comprising:
 a second insulation core having a first side and a second side; 
 two first cementitious boards each comprising at least one major surface, the two first cementitious boards stacked on top of each other along their at least one major surfaces and disposed on the first side of the second insulation core; 
 two second cementitious boards each comprising at least one major surface, the two second cementitious boards stacked on top of each other along their at least one major surfaces and disposed on the second side of the second insulation core, 
   wherein each cementitious board has a thickness that is approximately the same as each other.   
     
     
         14 . The building party wall assembly of  claim 13 , at least one of the cementitious boards comprising Sorel cement board. 
     
     
         15 . The building party wall assembly of  claim 13 , wherein each cementitious board is approximately one half inch thick. 
     
     
         16 . The building party wall assembly of  claim 13 , each of the first and second insulation cores comprising rigid foam insulation. 
     
     
         17 . The building party wall assembly of  claim 16 , each of the first and second rigid foam insulation cores comprising EPS foam. 
     
     
         18 . The building party wall assembly of  claim 13 , wherein each of the first and second rigid foam insulation cores is approximately 3⅝ inches thick. 
     
     
         19 . The building party wall assembly of  claim 13 , wherein the air gap is an approximately two-inch air gap. 
     
     
         20 . The building party wall assembly of  claim 13 , further comprising a plurality of nominal 2×4 inch pieces of lumber disposed at the edges of each structural insulated panel assembly thereby forming a frame. 
     
     
         21 . The building party wall assembly of  claim 13 , each cementitious board comprising a Sorel cement board reinforced with a fibrous layer on two major surfaces of the Sorel cement board. 
     
     
         22 . The building party wall of  claim 21 , the fibrous layer comprising a fiberglass mesh. 
     
     
         23 . The building party wall of  claim 1 , wherein none of the cementitious boards comprise gypsum. 
     
     
         24 . A building party wall assembly that reduces sound transmission and is fire resistant consisting essentially of:
 a first structural insulated panel assembly;   a second structural insulated panel assembly;   a plurality of pieces of lumber disposed at edges of each structural insulated panel assembly thereby forming a frame.   
       and
 an air gap separating the first and second structural panel assemblies; 
 the first structural insulated panel assembly comprising:
 a first insulation core having a first side and a second side; 
 a first cementitious board having a first thickness disposed on the first side of the first insulation core; 
 a second cementitious board having the first thickness disposed on the second side of the first insulation core; 
 
 the second structural insulated panel assembly comprising:
 a second insulation core having a first side and a second side opposite the first side; 
 a third cementitious board having a second thickness comprising at least one major surface, the third cementitious board disposed on the first side of the second insulation core; 
 a fourth cementitious board comprising at least one major surface, the fourth cementitious board having the second thickness disposed on the second side of the second insulation core, 
 the second thickness being at least twice the thickness of the first thickness.