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H72 Aluminium strip/ sheet coverings/ flashings

            TYPES OF ALUMINIUM WORK

  245 VALLEY GUTTER LINING
        • Underlay: Needle punched nonwoven polyester geotextile.
        • Aluminium: Coated sheet/ strip.
             - Alloy designation: EN AW-1200.
             - Temper: O.
             - Finish: Polyvinylidene fluoride (PVDF) coating.
             - Thickness: min 0.7 mm .
        • Forming: With a clear width not less than 200 mm.
        • Laying: In lengths not more than 3 m.
             - Cross joints: Double lock welts.
        • Joint with roof covering: Overlap gutter lining with roof coverings and join together
            with single lock welts.

  410 APRON FLASHINGSgenerally
        • Aluminium: Coated sheet/ strip.
             - Alloy designation: EN AW-1200.
             - Temper: O.
             - Finish: Polyvinylidene fluoride (PVDF) coating.
             - Thickness: min 0.7 mm.
        • Dimensions:
             - Lengths: Not more than 2 m, with end to end joints lapped not less than 100 mm.
             - Upstand: Not less than 100 mm.
             - Cover to abutment: Not less than 150 mm.
               Bottom edge welted 15 mm.
        • Fixing: Aluminium wedges into bed joint, clips to bottom edge at laps and 450 mm
            centres.

  420 COVER FLASHINGSgenerally
        • Aluminium: Coated sheet/ strip.
             - Alloy designation: EN AW-1200.
             - Temper: O.
             - Finish: Polyvinylidene fluoride (PVDF) coating.
             - Thickness: min 0.7 mm.
        • Dimensions:
             - Lengths: Not more than 2 m, with end to end joints lapped not less than 100 mm.
             - Cover to roofing upstand: Not less than 75 mm, with bottom edge welted 15 mm.
        • Fixing: Aluminium wedges into bed joint, clips to bottom edge at laps and 450 mm
            centres.

RotF generic (intermediate) NBS 2014  6118-AEW-XX-XX-NBS-A-01
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