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140 LOOSE LAID POLYETHYLENE GAS RETARDANT/ DAMP PROOFING
• Substrate: site specific.
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Thickness/ Gauge: site specific.
• Joints:
- Surfaces to be joined: Clean and dry beyond full width of joint.
- Laps (minimum): 150 mm.
- Sealing: Two continuous strips of double sided mastic tape between overlaps.
Roll to provide gas tight joints.
• Accessories: site specific.

150 LOOSE LAID BITUMEN DAMP PROOFING
• Substrate: site specific.
• Primer: Required.
• Bitumen sheet: To BS 743.
- Weight (minimum): 5.4 kg/m².
- Number of layers: One.
• Joints: Side laps minimum 100 mm.
- Sealing: Continuous even application of bitumen lap cement.

180 SELF-ADHESIVE BITUMEN GAS RETARDANT/ DAMP PROOFING/ TANKING
• Substrate: site specific.
• Primer: Required.
• Manufacturer: Contractor's choice.
- Product reference: Agrément certified.
• Number of layers: One.
• Thickness/ Gauge: site specific.
• Bonding: Full. Smooth out to exclude air.
• Joints:
- Surfaces to be joined: Clean and dry beyond full width of joint.
- Laps (minimum): 150 mm.
- Sealing: Roll to fully adhere.
• Accessories: site specific.

210 FULLY BONDED BITUMEN DAMP PROOFING
• Substrate: site specific.
• Primer: Bitumen primer.
• Bitumen sheet: To BS 743.
- Weight (minimum): 5.4 kg/m².
- Number of layers: One.
• Bonding: Hot applied bonding compound.
• Joints: Side and end laps minimum 100 mm and 150 mm respectively.
• Sealing: Fully bond.

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