CEN/TC 254/WG 4 - Water vapour transmission, water tightness and root resistance

This European Standard specifies a method to determine the resistance of roof waterproofing sheets to root penetration.
This European Standard relates exclusively to sheets. It is not possible to test a system comprising several different sheets.
This European Standard does not contain any evaluation of the sheet to be tested in respect of its environmental requirements.

This European Standard specifies a method for the determination of the water vapour transmission properties and for the calculation of the density of moisture flow rate g and of the moisture resistance factor µ of waterproofing sheets. It is applicable to factory made bitumen, plastic and rubber sheets for roof waterproofing.

This European Standard specifies the equipment and procedures for determining the watertightness, i.e. the resistance to ponding water or to hydraulic pressure absorbed by a limited part of the surface, of factory made products. It is applicable to bitumen, thermoplastic and elastomeric sheets.