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140 CERAMIC SLATE ROOF TILING WITH COUNTERBATTENS
• Substrate: site specific rfater design.
• Pitch: site specific.
• Underlay: Reinforced bitumen, Type 1F.
- Recycled content: Submit proposals.
- Direction: Parallel to eaves.
- Head-lap (minimum): 150 mm.
• Counterbattens:
- Size: site specific.
- Fixing: site specific.
• Battens: site specific.
- Fixing: site specific.
• Link channels: site specific.
• Clips: site specific.
• Tiles:
- Manufacturer: site specific.
Product reference: site specific.
- Colour: site specific.
- Size: site specific.
- Head-lap (minimum): 100 mm.
- Fixing: Lay ceramic slates into hooks of link channel clips. Leave 1.5 mm gap
between slates.
• Accessories: site specific.

TILING GENERALLY

210 BASIC WORKMANSHIP
• General: Fix tiling and accessories to make the whole sound and weathertight at
earliest opportunity.
• Setting out: To true lines and regular appearance, with neat fit at edges, junctions
and features.
• Fixings for accessories: As recommended by tile manufacturer.
• Gutters and pipes: Keep free of debris. Clean out at completion.

220 REMOVING EXISTING TILING
• General: Carefully remove tiles, battens, underlay, etc. with minimum disturbance
of adjacent retained tiling.
• Undamaged tiles: Set aside for reuse.

240 UNDERLAY
• Handling: Do not tear or puncture.
• Laying: Maintain consistent tautness.
• Vertical laps (minimum): 100 mm wide, coinciding with supports and securely fixed.
• Fixing: Galvanized steel, copper or aluminium 20 x 3 mm clout head nails.
• Eaves: Where exposed, underlay must be BS 8747, Annex B, Type 5U, or an
equivalent UV durable type.
• Penetrations: Use proprietary underlay seals or cut underlay to give a watertight fit
around pipes and components.
• Ventilation paths: Do not obstruct.

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