Flexible sheets for waterproofing - Determination of dimensional stability - Part 1: Bitumen sheets for roof waterproofing

This document specifies the test methods for determining dimensional stability of flexible waterproofing membranes, with a specific focus on bitumen-based sheets used for roofing applications. It outlines the procedures necessary to evaluate how these materials respond to variations in temperature and humidity, which are critical factors affecting the long-term performance of roofing systems. The testing protocol involves subjecting samples to controlled thermal conditions followed by measurement of any resulting deformation or shrinkage. Detailed instructions are provided for sample preparation, conditioning, and the actual measurement process to ensure consistent and reproducible results across different laboratories. By establishing a standardized approach, this document facilitates quality control during manufacturing and aids in the assessment of product conformity for roofing materials intended for use in building construction. It is applicable to manufacturers, testing facilities, and quality assurance departments within the construction industry who need to verify the physical properties of waterproofing membranes.