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H31 Metal profiled/ flat sheet cladding/ covering

TYPES OF CLADDING SYSTEM

120 METALgenerally
• Support structure: site specific; generallygalvanized steel Zed purlins.
- Bearing width (minimum): material specific.
- Pitch: site specific.
• External sheets: Steel to BS EN 508-1.
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.
- Material: Steel to BS EN 10346, grade S220GD+Z275.
- Thickness (nominal): min 0.7 mm.
- Finish side 1 (outer): site specific.
Colour: site specific.
- Finish side 2 (inner): site specific.
Colour: site specific.
- Additional requirements: None.
• Accessories: As required to complete installation.
• Primary cladding/ covering sheet fasteners: Self drilling and tapping stainless steel
stand off screws with assembled stainless steel EPDM elastomer faced sealing
washer and plastics cap colour.
- Fastener profile location: Crown.
- Number of fasteners per sheet width:
Eaves and end laps: site specific.
Intermediate supports: site specific.
• End laps size (minimum): as manufacturers recomendations.
• Sealing laps:
- End laps: Two rows of partially cross linked butyl rubber sealant tape.
- Side laps: One row of partially cross linked butyl rubber sealant tape.
• Stitching laps:
- End laps: Self drilling stainless steel screws with assembled stainless steel EPDM
elastomer faced sealing washer and plastics cap colour.
- Side laps: Self drilling stainless steel screws with assembled stainless steel EPDM
elastomer faced sealing washer and plastics cap colour.
• Spacers: site specific.
- Fasteners: site specific.
• Breather membrane: site specific.
• Thermal insulation: site specific.
• Vapour control layer: site specific.
• Acoustic insulation: site specific.
• Lining sheets: site specific.
• Additional requirements: site specific.

FIXING CLADDING/ COVERING

215 PAINTING STRUCTURE
• Sequence: Paint outer surface of supporting structure before fixing cladding/
covering.

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