Intumescent gap seals

Abstract

An intumescent gap seal comprises at least one flexible resilient sealing member ( 7,8 ) adapted to span a gap ( 4 ) defined between adjacent parts of a building ( 5,6 ) and an intumescent member ( 9 ) which, in an unexpanded state, is narrower than the gap ( 4 ). The or each sealing member ( 7,8 ) may comprise a curved elongate member to ease installation. Such a sealing member ( 7,8 ) will tend to keep its resilience better, so that its draught proofing qualities are maintained and will be easier to install.

1 . An intumescent gap seal adapted to span a gap defined between adjacent parts of a building, comprising at least one flexible resilient sealing member adapted to span said gap, and an intumescent member which, in an unexpanded state, is narrower than said gap.  
   
   
       2 . A seal as claimed in  claim 1 , wherein said at least one sealing member comprises a curved elongate member having lateral edges engaging a respective building part of the adjacent parts of the building.  
   
   
       3 . A seal as claimed in  claim 1 , in which a central portion of said at least one flexible resilient sealing member is thicker than said lateral edges.  
   
   
       4 . A seal as claimed in  claim 2 , in which said at least one flexible resilient sealing member is arranged so that a concave side faces the outside of the gap defined between the adjacent parts of the building.  
   
   
       5 . A seal as claimed in  claim 1 , in which said intumescent member is attached to a central porition of said at least one flexible resilient sealing member.  
   
   
       6 . A seal as claimed in  claim 1 , in which said intumescent member is an elongate strip of rectangular cross-section.  
   
   
       7 . A seal as claimed in  claim 1 , in which two of said at least one flexible resilient sealing members are provided, separated by said intumescent member.  
   
   
       8 . A seal as claimed in  claim 2 , in which two flexible resilient sealing members are provided, separated by said intumescent member and arranged in the same orientation so that each curves in the same way.  
   
   
       9 . A seal as claimed in  claim 8 , in which said intumescent member is attached to a convex side of one of said sealing members and a concave side of the other of said sealing members.  
   
   
       10 . A seal as claimed in  claim 1 , in which the said sealing members are of plastics.  
   
   
       11 . A seal as claimed in  claim 1 , in which said sealing members are of rubber material.  
   
   
       12 . A seal as claimed in  claim 1  in which said sealing members are of EPDM.  
   
   
       13 . A seal as claimed in  claim 1 , in which said intumescent member comprises a mixture of intumescing material and a carrier material.  
   
   
       14 . A seal as claimed in  claim 13 , in which said intumescing material is graphite.  
   
   
       15 . A seal as claimed in  claim 13 , in which said carrier material is a plastics material.  
   
   
       16 . A seal as claimed in  claim 15 , in which said plastics material is compatible with the material of said at least one flexible resilient sealing member.  
   
   
       17 . A seal as claimed in  claim 15 , in which said carrier material is the same as the material of said at least one flexible resilient sealing member.  
   
   
       18 . A seal as claimed in  claim 1 , in which said at least one flexible resilient sealing member is co-extruded with said intumescent member.