Click here to download Corodek® PDF Click here to download Corodek® Installation Hints PDF Enquire About Corodek® Now For roofs with continuous sheets and no end laps the minimum roof pitch is 5° (1 in 12). For roofs with end laps the minimum lap is 200mm for pitches between 5° and 15° and 150mm above 15°. For walls allow maximum end laps of 100mm.