Rothoblaas - Tapes, Sealants and Membranes Página 198
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MEMBRANE PERFORMANCE The membranes undergo various tests to determine their performance. Based on these, it is possible to choose the most suitable solution for your project. WATERTIGHTNESS UV STABILITY AND AGEING Ability of the product to temporarily prevent the passage of water during construction and in case of accidental breakage and dislocation of the roof covering. Passing this test is not sufficient to make the products suitable to replace the sealing layer and to withstand standing water for long periods. Is the value relative to annual median radiation in the Central Europe zone, formulated based on EN 13859-1/2 (55 MJ/m2). This property indicates resistance to penetration of water. Standard EN 13859-1/2 establishes the following classification: The test method consists of exposing the specimens to continuous UV irradiation at elevated temperature for 336 hours. This corresponds to a total UV radiation exposure of 55 MJ/m2. For walls that do not exclude UV exposure with open joints, artificial ageing by UV must be extended over a period of 5000 hours. Resistance to water penetration, tensile strength and elongation must be determined after artificial ageing. • W1: High resistance to penetration of water • W2: Medium resistance to penetration of water • W3: Low resistance to penetration of water Standard EN 13859-1 and 2 establishes a requirement of resistance to 200 mm of static water pressure for 2 hours (classification W1). NOTE: for vapour control membranes and control layers, the word "conforming" is only used when the product meets the most severe requirements of the test indicated above (200 mm static water pressure for 2 hours). Note: actual climatic conditions are variable and depend on the application context, so it is difficult to establish an exact match between artificial ageing tests and actual conditions. TENSILE STRENGTH ELONGATION CD CD MD MD Force exercised both longitudinally and transversally, to determine the maximum load, expressed as N/50 mm. Indicates the maximum elongation percentage the product can suffer before failure. RESISTANCE TO NAIL TEARING MASS PER UNIT AREA CD MD Force exercised both longitudinally and transversally with the insertion of a nail, to determine the maximum load, expressed in N (Newton). Mass per unit area expressed in g/m2. High mass per unit area ensure great mechanical performance and superior abrasion resistance. MD / CD: longitudinal/transversal values with respect to the direction the membrane rolls 198 | BREATHABLE AND VAPOUR CONTROL SCREENS | MEMBRANES
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