EN 13859-1 is a European standard, fully titled "Flexible sheets for waterproofing - Definitions and characteristics of underlays - Part 1: Underlays for discontinuous roofing". Below is some important information about this standard, shared:

Scope of products applicable to EN 13859-1: This standard specifies the characteristics of flexible sheets used beneath discontinuous roof coverings, including requirements, test methods, and the evaluation of conformity of products with the standard's requirements.

Significance of EN 13859-1 certification: In the EU market, the "CE" mark is a mandatory certification mark. For flexible sheet underlay products used in waterproofing, affixing the "CE" mark not only proves that the product complies with the safety, environmental, health, and consumer protection requirements stipulated by the Construction Products Regulation (CPR 305/2011/EU) and its related standards (EN 13859-1), but also helps the product reasonably avoid technical trade barriers, enabling free sales in the European market and access to other international markets.

Main test items of EN 13859-1:

Fire rating: Tested according to EN 13501-1 to determine the classification.

Water impermeability: Different grades have different test standards, such as W1 grade complying with EN 1928, and W2 grade complying with EN 13111.

Water vapor transmission performance: Must meet the declared value, tested according to EN 1931 and ISO 12572.

Tensile performance: Must meet the declared value, tested according to EN 12311-1.

Tear resistance: Must meet the declared value, tested according to EN 12310-1.

Dimensional stability: Must not exceed the declared value, tested according to EN 1107.

Low-temperature flexibility: Must not exceed the declared value, tested according to EN 1109.

Aging test: Must meet the declared value, conducted according to EN 13859-1.

Air permeability resistance: Tested according to EN 13859-2 to obtain the measured value.

Watertightness: Tested according to EN 1928 to obtain the measured value.

Radiation resistance: Tested according to EN 15976 to obtain the measured value.

Hazardous substances: Must comply with EU regulations.

This standard is of great significance in ensuring the quality and performance of flexible sheet underlays used for discontinuous roofing. Manufacturers wishing to enter the European market with their products must meet the requirements of this standard and obtain relevant certification.

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