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430 STEP 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 at every course, clips to bottom edge at laps and 400
mm centres.

440 SOAKERS AND STEP FLASHINGSgenerally.
• Aluminium: Coated sheet/ strip.
- Alloy designation: EN AW-1200.
- Temper: H12.
- Finish: Polyvinylidene fluoride (PVDF) coating.
- Thickness: min 0.7 mm.
• Soakers:
- Cut and folded for fixing by roofer.
- Length: Slate/ tile gauge + lap + 25 mm.
- Upstand: Not less than 75 mm.
- Underlap: Not less than 100 mm.
• Step flashings:
- Lengths: Not more than 2 m, with end to end joints lapped not less than 100 mm.
- Cover: Overlap to soaker upstands not less than 60 mm, with bottom edge
welted 15 mm.
- Fixing: Aluminium wedges at every course, clips to bottom edge at laps.

450 STEP AND 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.
- Upstand: Not less than 75 mm.
- Cover to roof: Not less than 150 mm.
• Fixing: Aluminium wedges every course and clips at laps and not more than 500
mm centres along free edge.

470 MISCELLANEOUS 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.
• Fixing: Welt top and bottom edges and secure with clips at 450 mm centres.

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