Glass fibre mat and use thereof for built-up roofing

Abstract

The invention relates to a fibre-based mat that can be used for making up bituminous membranes, comprising glass fibres, organic fibres and a binder, characterized in that the organic fibres have a shrinkage at 130° C. of less than or equal to 5%. The invention also relates to a bituminous membrane comprising a substrate coated, covered or impregnated with a bituminous matrix, in which the substrate is a mat as above. The mat and the membrane can be used for the production of roofing and/or damp-proofing.

1 . Fibre-based mat that can be used for making up bituminous membranes, comprising glass fibres, organic fibres and a binder, characterized in that the organic fibres have a shrinkage at 130° C. of less than or equal to 5%.  
     
     
         2 . Mat according to  claim 1 , characterized in that the organic fibres have a shrinkage at 130° C. of less than or equal to 3%.  
     
     
         3 . Mat according to  claim 1  or  2 , characterized in that the organic fibres are based on a semicrystalline polymer.  
     
     
         4 . Mat according to any one of the preceding claims, characterized in that the fibres are polyester, especially polyethylene terephthalate, fibres.  
     
     
         5 . Mat according to any one of the preceding claims, characterized in that the organic fibres contain a sizing composition allowing the individual filaments to be dispersed in water.  
     
     
         6 . Mat according to any one of the preceding claims, characterized in that the proportion of organic fibres is about 5 to 30% by weight with respect to the total weight of fibres.  
     
     
         7 . Mat according to any one of the preceding claims, characterized in that the binder content is about 15 to 30% by weight with respect to the total weight of the mat.  
     
     
         8 . Mat according to any one of the preceding claims, characterized by a grammage of 30 to 150 g/m2.  
     
     
         9 . Bituminous membrane comprising a substrate coated, covered or impregnated with a bituminous matrix, characterized in that the substrate is a mat according to any one of the preceding claims.