Cavity forming device and method of constructing a cavity wall

Abstract

A cavity forming device, also referred to as a cavity forming retaining clip, includes a first face and a second face. The first face and the second face are connected together by a body. The body is elongate and extends along an imaginary longitudinal axis from the first face to the second face. The body separates the first face from the second face by a predetermined distance. The second face is arranged to receive a wall therethrough. In use a backing board for an outer skin is able to be clamped against the cavity forming device.

1 . A cavity forming for a cavity wall, the device comprising:
 a first face;   a second face connected to the first face by the body to set a predetermined distance between the first face and the second face corresponding to a cavity depth in use; and   wherein   the second face is arranged to receive a wall tie therethrough.   
     
     
         2 . The cavity forming device of  claim 1 , wherein the device has means for securing the cavity forming device within the cavity wall. 
     
     
         3 . The cavity forming device of  claim 2 , wherein the means for securing allows the cavity forming device to attach to a wall tie. 
     
     
         4 . The cavity forming device of  claim 3 , wherein the means for securing is a detent notch for attachment to the wall tie, wherein the detent notch is located on the second face. 
     
     
         5 . The cavity forming device of  claim 1 , wherein the cavity forming device comprises a channel with abutment shoulders for attaching the device to the wall tie. 
     
     
         6 . The cavity forming device of  claim 1 , wherein in which the cavity forming device has a lug defining an aperture which is arranged adjacent the first face. 
     
     
         7 . The cavity forming device of  claim 1 , wherein the first forms a generally horse-shoe type circumferential rim defining an opening. 
     
     
         8 . The cavity forming device of  claim 1 , wherein the body is generally cylindrical and comprises a plurality of ribs. 
     
     
         9 . The cavity forming device of  claim 8 , wherein the ribs include bowed mid sections to prevent moisture travelling along the ribs. 
     
     
         10 . The cavity forming device of  claim 1 , wherein the body comprises a slot adjacent the first face. 
     
     
         11 . A method of constructing a cavity wall, the method comprising:
 a) building an inner skin to a predetermined height including attaching at least one wall tie;   b) securing a cavity forming device against the inner skin so that the cavity forming device receives the wall tie;   c) positioning an outer skin backing board against the cavity forming device;   d) securing the backing board against the cavity forming device using the wall tie;   e) building an outer skin to a predetermined height adjacent the backing board using the wall tie to secure the outer skin to the inner skin.   
     
     
         12 . The method of  claim 11 , wherein the cavity forming device is secured against the inner skin using the wall tie. 
     
     
         13 . The method of  claim 11 , wherein the backing board is secured against the cavity forming device using a wall tie retaining clip. 
     
     
         14 . A cavity wall comprising:
 an inner skin including at least one wall tie;   a cavity forming device arranged against the inner skin so that the cavity forming device receives the wall tie;   an outer skin backing board held against the cavity forming device;   a wall tie retaining clip attached to the wall tie to hold the backing board against the cavity forming device; and   an outer skin adjacent the outer skin backing board.   
     
     
         15 . The cavity wall of  claim 14  wherein the backing board is corrugated polypropylene board.