GB/T 328.4-2007 in English

《GB/T 328.4-2007建筑防水卷材试验方法 第4部分：沥青防水卷材 厚度、单位面积质量》由TC195（全国轻质与装饰装修建筑材料标准化技术委员会）归口，TC195SC1（全国轻质与装饰装修建筑材料标准化技术委员会建筑防水材料分会）执行，主管部门为中国建筑材料联合会。
本标准规定了对高分子屋面防水卷材厚度、单位面积质量的测定方法。

Scope

This part specifies the methods for measuring the thickness and mass per unit area of asphalt roof waterproofing membranes. Thickness applies to most asphalt coils, including those containing mineral materials. Thickness measurements are not applicable to rolls that have a pronounced surface texture or have a strong fibrous backing. For these products, mass per unit area is used instead of thickness. The determination of mass per unit area is suitable for checking the declared value declared by the manufacturer, but not for perforated materials.