This standard BS EN 13859-1:2014 Flexible sheets for waterproofing. Definitions and characteristics of underlays is classified in these ICS categories:
01.040.91 Construction materials and building (Vocabularies)
91.100.50 Binders. Sealing materials
This European standard specifies the characteristics of flexible sheets for underlays which are to be used under roof covering of discontinuous roofs. It specifies the requirements and test methods and provides for the evaluation of conformity of the products with the requirements of this document.