For roofs with continuous sheets and no end laps
the minimum roof pitch is 2° (1 in 30). To prevent
ponding from occurring this minimum pitch must be
adhered to at all points of the roof. For roofs with
end laps the minimum lap is 200mm for pitches
between 2° and 15° and 150mm above 15°. For
walls allow maximum end laps of 100mm.