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Standards Development
This European Standard specifies a procedure for artificial ageing of flexible sheets for underlays which are used under discontinuous roof coverings by means of UV-radiation, elevated temperature in combination with high relative humidity and elevated temperature in combination with accelerated air-speed.
During its time on the roof, a discontinuous roofing underlay is exposed to different climatic conditions. During installation, whilst the roof is open prior to application of the primary covering, the underlay is exposed to UV and direct weathering. After completion of the roof, the underlay is subject to long term oxidation and hydrolysis, being exposed to elevated temperatures in combination with high relative humidity and accelerated air-speed due to wind-driven and thermally-driven air flows. The method described in this test standard is designed to simulate these relevant exposures, which affect the durability of an underlay.
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