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The church of St. Franzikus, 2004 built in Regensburg, is the first important work of Königs Architekten, young architects of Cologne. One very important element of the interior space is a membrane of teflon. The project started in 1998. There are some cuts in the inner and outer wall, the results are several interesting mysterious daylight effects. Just from the beginning there were several interesting ideas and visions about the atmospheres space and light should have. But there was a long way from the idea to that St. Franziskus which one can visit today. The quality of light and the wanted atmospheres were discussed. The result was to build the ceiling of the church out of several layers. The first layer is a textile membrane which is stretched over the whole space. For architecture it is the defined ceiling. The real constructive roof (flat shed roof) is 2.00 m higher. The room between those two levels is used for modelling of daylight and to house artificial light fittings. With the use of the textile membrane, the room between the screen and the roof itself daylight should be controlled. Besides that the textile membrane should be a screen to be lit with artificial light. That meant a lot of requirements the textile membrane should fulfil. To choose the right material mock-ups and examinations in suitable scales were made. Today 570 g Teflon-membrane (PTFE - Polytetrafluorethylen) are stretched over the whole space of the church. To reach this size several length of material were sewed. The special quality of the textile membrane is responsible for the light and space atmosphere one can see today. The white PTFE membrane prevents a direct view of the conventional flat shed roof and acts as a screen of natural and artificial light. Utilising a combination of closed, semi-transparent and clear roof panels, daylight is directed, for example, onto the altar. The flat shed roof is designed in consideration of the orientation of the building.