Abstract
The system of mechanic fastening is one of the most frequently used variants of roof membrane stabilization against the impacts of wind sucking. With the growing number of applications of mechanically fastened roofs the number of defects is also growing. We particularly see them in the joints of waterproofing membranes. The contribution is thus dedicated to examination of mutual dependence between the type of the carrier and the strength characteristics of mechanically fastened joints of these sheets. Bitumen sheets with different types of carrier used for onelayer mechanically fastened waterproofing membranes of flat roofs were chosen as samples. The above mentioned dependence is frequently stated in the practice, but is not explicitly documented. The aim of the contribution is to confirm or refute a hypothesis that a relation between the bitumen sheet carrier type and the strength of their joints exists. The results were arranged on the base of statistic evaluation of data obtained by laboratory measurement.
Highlights
The application of the single-layer mechanically fastened bitumen sheet system is a quick and progressive one, which requires high technological discipline
High quality bitumen sheets of at least 0.5 mm thickness are required as standard for the application of singlelayer systems
The bitumen sheets need to be of a sufficient quality that they are weldable and flexible over the long term
Summary
The application of the single-layer mechanically fastened bitumen sheet system is a quick and progressive one, which requires high technological discipline. High quality bitumen sheets of at least 0.5 mm thickness are required as standard for the application of singlelayer systems. The bitumen sheets need to be of a sufficient quality that they are weldable and flexible over the long term. The sheets are mostly reinforced with a combination of PES fleece strengthened with glass fibres laid in one or both directions. Overlaps of at least 120 mm wide are recommended for the sheets. Whole surface melting of the joint is essential to the waterproofing capabilities of the system as well as for the transfer of wind load forces. A critical point with regards to the wind load resistance of a joint is the presence of a fastening element
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