What is BS EN 1931 - Determination of water vapour transmission properties about?
BS EN 1931 is a series on flexible sheets for waterproofing. Flexible sheets for waterproofing are used to prevent water from contacting another material that it is placed over.
BS EN 1931 specifies a method for the determination of the water vapour transmission properties and the calculation of the density of moisture flow rate g and the moisture resistance factor u of waterproofing sheets. BS EN 1931 applies to factory-made bitumen, plastic, and rubber sheets for roof waterproofing.
Who is BS EN 1931 - Determination of water vapour transmission properties for?
BS EN 1931 on the determination of water vapour transmission properties is useful for:
- Construction site supervisors
- Civil engineers
- Waterproofing sheet manufacturers
- Design engineers
- Quality control personnel
Why should you use BS EN 1931 - Determination of water vapour transmission properties?
Flexible sheets for waterproofing are used in a system to prevent the ingress of water into foundations, roofs, walls, basements, buildings, and structures when properly installed. BS EN 1931 has been prepared by the Technical Committee CEN/TC 254 to determine the water vapour transmission properties of flexible sheets for waterproofing. BS EN 1931 has been prepared for applications in roofing, but it may also be used in other areas where it is relevant. BS EN 1931 is intended for the characterization of flexible sheets for waterproofing as manufactured or supplied before use. BS EN 1931 relates exclusively to products and not to waterproofing membrane systems composed of such products and installed in the works. The test specimen is sealed to the open flange of a test cup containing a desiccant.
The assembly is then placed in an atmosphere with a controlled temperature and humidity. When mass take-up is linear over a period of time, the assembly is weighed periodically to determine the density of moisture flow rate through the test specimen into the desiccant. Due to the nature of the bitumen, plastic or rubber sheets concerned, the test procedure given in BS EN 1931 consists of two methods which are Method A: test procedure for bitumen sheets and Method B: test procedure for plastic or rubber sheets. The technical content of BS EN 1931 is, where relevant, adapted to these parts accordingly. Using BS EN 1931 you can specify a method for the determination of the water vapour transmission properties and the calculation of the density of moisture flow rate g and the moisture resistance factor u of waterproofing sheets.
