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For roofs with continuous sheets and no end laps the
minimum roof pitch is 1† (1 to 60). 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 5† and 15†
and 150mm above 15†. For walls allow maximum end laps
of 100mm. End laps in roofs of less than 5† should be
sealed with a suitable sealant. The sealant should be
in two runs; one at the low end of the lap to prevent
moisture being drawn in by capillary action. The other
should be at the high end of the lap to prevent condensation
that may form under the top sheet, from draining down
the underside and entering the lap. Sheets should be
laid in the opposite direction to the prevailing weather.
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