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250 FULLY BONDED BITUMEN TANKING
• Substrate: site specific.
• Primer: Required.
• Bitumen sheet: Generally to BS 743.
- Weight (minimum): 3.8 kg/m².
• Number of layers: Three, laid to break joint.
• Bonding: Hot applied bonding compound.
• Joints: Side and end laps minimum 100 mm and 150 mm respectively.
- Sealing: Fully bond.
• Subsequent layers: Apply as soon as possible.

290 HIGH DENSITY POLYETHYLENE/ POLYPROPYLENE STUDDED CAVITY DRAIN MEMBRANE
• Substrate: site specific.
- Preparation: Primer.
• Manufacturer: Contractor's choice.
- Product reference: Agrément certified.
• Stud height: site specific.
• Colour: site specific.
• Fixing: In accordance with manufacturer's recommendations.
- Fasteners: In accordance with manufacturer's recommendations.
Fixing centres: In accordance with manufacturer's recommendations.
Sealing: Taped flush with the membrane.
• Joints: Lapped minimum three studs.
- Sealing: Butyl rubber sealant between last two rows of studs and joints overtaped.

• Drainage components: site specific.
• Accessories: site specific.

295 GEOCOMPOSITE STUDDED CAVITY DRAINAGE/ VENTING MEMBRANE
• Substrate: site specific.
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Stud height: site specific.
• Fixing: As manufacturer's recommendations.
- Fixing centres: As manufacturer's recommendations.
• Joints: Seal with waterproof tape or rope.
• Exposed edges and corners: Seal with geotextile fabric to prevent silt entering the
core.
• Accessories: site specific.

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