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420 PVC-U PIPEWORK - EXTERNAL
• Standard: To BS EN 12200-1, Kitemark certified.
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Recycled content: Submit proposals.
• Section: site specific.
• Nominal size: site specific.
• Colour: site specific.
• Brackets: PVC-U clips, black.
- Fixings: Stainless steel screws.
Size: site specific.
• Accessories: Access fittings.

425 PVC-U PIPEWORK - SEALED
• Standard: To BS EN 1329-1 or BS 4514, Kitemark certified.
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Recycled content: Submit proposals.
• Nominal size: site specific.
• Colour: site specific.
• Brackets: PVC-U clips, black.
- Fixings: Stainless steel screws.
Size: site specific.
• Accessories: site specific.

445 INSULATION TO INTERNAL GUTTERS
• Material: Foil faced mineral fibre.
• Thermal conductivity (maximum): Not applicable unless advised on a site specific
basis.
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Recycled content: Submit proposals.
• Thickness: 50 mm minimum.
• Fire performance: Class 1 spread of flame when tested to BS 476-7 or Class CL to BS
EN 13501-1 where appropriate.

450 INSULATION TO INTERNAL PIPELINES
• Material: Preformed flexible mineral fibre split tube.
• Thermal conductivity (maximum): 0.045 W/m«K.
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Recycled content: Submit proposals.
• Thickness: 25 mm minimum.
• Fire performance: Class 1 spread of flame when tested to BS 476-7 or Class CL to BS
EN 13501-1 where appropriate.

455 MASKING PLATES
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Material and finish: Plastics, self finish.
• Fixing: Integral clamping screws.

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