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Key Features
• In all cases the building frame must include structural elements running up the angle of the valley to support the edge of the cladding and withstand all load cases.
• All fixings and seals must be to manufacturers' recommendations.
• Thermal bridging is potentially high, depending on the gutter design.
• The cover trims on the cut edges of composite panels cover the cut edge and exposed insulation, but they can also act as a dirt/debris trap for water running down the roof. Large gaps required, and regular maintenance/inspection.
• All exposed site cut steel edges should be coated to resist corrosion.
• All flashing joints to manufacturers' instructions.
• Details should be provided for the upslope and downslope ends of hip valleys. These are awkward, and usually left to the sheeters on site.

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