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Trough Section

Trough sections generally have 2 to 3 pans or trays of 180-250 mm width, interspersed with steep ribs.  Older profiles may have a single pan. They are secret fixed to minimise fastener penetrations and allow for thermal expansion.

The wide deep pans on trough sections allow for greater water carrying capacity. Traditionally they were used for pitches as low as 1° but due to durability issues (caused by deflection and ponding) the recommended minimum pitch is 3° (see Minimum Roof Cladding Pitch). Recent innovations in product design have blurred the lines between Trough profile and Standing Seam.

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