Standards Development
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 products, mass per unit area should be used instead.
The determination of mass per unit area serves to verify the value stated by the manufacturer for information and is not applicable to perforated materials.
The main purpose of this revision is to add a tolerance to the diameter and pressure of the measuring head, such as is also done in EN 1849-2. This revision should bring part 1 fully in line with part 2 on this matter.
The request for this revision was made by SC 1 after considering the result of the latest Systematic Review of EN 1849-1 (N2291). More context is documented in the draft minutes of the SC 1 webmeeting on 21-1-2025 (N623 of SC 1), and the activity report of SC 1 for the 2025 CEN/TC 254 plenary meeting (N2308)
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