GB/T 328.11-2007 "Test Methods for Building Waterproofing Sheets - Part 11: Bitumen Waterproofing Sheets - Heat Resistance" is applicable to the determination of the heat resistance of bitumen waterproofing sheets, including two methods: the oven test method and the thermal aging test method. The test requires the use of an electrically heated forced-air oven with a temperature control accuracy of ±2°C, a specimen suspension device, and a ruler or caliper for observation. By heating the specimen at a specified temperature and observing whether phenomena such as flow, slippage, or dripping occur, or by measuring changes in performance after thermal aging, the heat resistance of the sheet is evaluated to ensure its reliability in high-temperature environments.