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J40 Flexible sheet waterproofing/ damp proofing

110 SOFT BLINDING TO HARDCORE BEDS
• Material: Soft sand.
- Thickness (minimum): site specific.
• Finish on completion: Smooth, consolidated bed free of sharp projections.

115 CONCRETE BLINDING TO HARDCORE BEDS
• Concrete: Designated GEN 1 or Standardized prescribed ST2.
- Thickness: site specific.
• Finish on completion: Smooth.

TYPES OF TANKING/ DAMP PROOFING

120 LOOSE LAID POLYETHYLENE DAMP PROOFING
• Substrate: site specific.
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice to PIFA Standard 6/83A or Agrément
certified.
• Thickness/ Gauge: site specific.
• Recycled content: Submit proposals.
• Joints:
- Surface to be joined: Clean and dry beyond full width of joint.
- Laps (minimum): End and side, min 150 mm.
- Sealing: Continuous mastic strip between overlaps; edge of top sheet sealed
with jointing tape.

130 LOOSE LAID POLYETHYLENE OVERSITE DAMP PROOFING
• Substrate: site specific.
• Manufacturer: site specific.
- Product reference: Contractor's choice to PIFA Standard 6/83A or Agrément
certified.
• Thickness/ Gauge: site specific.
• Recycled content: Submit proposals.
• Joints:
- Surfaces to be joined: Clean and dry beyond full width of joint.
- Laps (minimum): End and side, min 150 mm.
- Sealing: Continuous mastic strip between overlaps; edge of top sheet sealed
with jointing tape.
• Accessories: site specific.
• Covering: Concrete to BS 8500-2, Designated GEN 1 or Standardized prescribed ST2.

- Thickness (minimum): 50 mm.
- Timing: Immediately after placing membrane.

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