Page 238 - McD_6118-AEW-XX-XX-NBS-A-001_Neat
P. 238
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