Flexible sheets for waterproofing. Determination of thickness and mass per unit area - Bitumen sheets for roof waterproofing Ingestion-build-177197 This part of PD 7974

This part of PD 7974 covers all aspects of a building and its contents

The values for the surface roughness have been changed

electrical resistance

Test methods for electrical characteristics

Flexible sheets for waterproofing. Determination of thickness and mass per unit area - Bitumen sheets for roof waterproofing Ingestion-build-177197 This part of PD 79741 Scope This European Standard specifies a method for the determination of thickness and mass per unit area of bitumen sheets for roof waterproofing. The measurement of thickness is appropriate for most bitumen sheets including sheets with a factory applied mineral finish The determination of thickness is not applicable to sheets with pronounced surface texture or to sheets with a substantial fibrous backing. Where it is required to characterize these