One of the frequent sources of flat roof faults is failure of the top layer of a multilayer bitumen sheet system in cross-connections. One of the possible causes of this disorder is failure to observe technological discipline. The paper deals with how the full melting of the bitumen sheet influences its possible shrinkage during the roof exposure. Bitumen sheets with a polyester carrier which is not reinforced with fiberglass fibers are burdened with shrinkage effect. The preload is introduced into these belts during production. The aim is to show how is the effect on loosening the preload in the carrier layer with full-scale smelting during the realization of the waterproofing layer. The preload loosening experiment, expressed by the dimensional stability test according to ?SN EN 1107, was performed in a laboratory on two bitumen sheets.
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机译：平屋顶故障的常见来源之一是多层沥青薄板系统顶层的交叉连接故障。造成这种疾病的可能原因之一是未能遵守技术纪律。本文讨论了沥青板的完全熔化如何影响屋顶暴露期间的可能收缩。不具有玻璃纤维增强的聚酯载体的沥青片材具有收缩作用。在生产过程中将预紧力引入这些皮带。目的是显示在实现防水层期间通过全面熔炼来减轻载体层中预载荷的效果。在实验室中，对两张沥青薄板进行了预压松试验，该试验由尺寸稳定性试验根据？SN EN 1107表示。
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