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625 CURVED PLAIN TILE VALLEYS
• Underlay: Lay strips not less than 600 mm wide centred on valleys. Overlap with
general roof underlay.
• Curved valley tiles:
- Product reference: Contractor's choice.
• Roof tiles: Cut adjacent tiles to fit neatly.

660 SIDE ABUTMENTS
• Underlay: Turn up not less than 100 mm at abutments.
• Abutment tiles: Cut as necessary. Fix close to abutments.
• Soakers: Interleave with abutment tiles. Fix by turning down over head of abutment
tiles.

670 TOP EDGE ABUTMENTS
• Underlay: Turn up not less than 100 mm at abutments.
• Top course tiles: Fix close to abutments.

675 TOP EDGE VENTILATED ABUTMENTS
• Underlay: Provide air gap at abutment as recommended by ventilator
manufacturer.
• Abutment ventilator:
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.
- Fixing: As recommended by manufacturer.

700 DRY VENTILATED RIDGES
• Underlay: Provide air gap at apex.
• Dry ridge fixing battens: site specific.
• Dry ridge tiles:
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.
• Ridge terminals:
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.

710 DRY RIDGES
• Underlay: Lay courses over ridge.
- Overlap (minimum): 100 mm.
• Dry ridge fixing battens: site specific.
• Dry ridge tiles: site specific.
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.
• Ridge terminals:
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.

840 VENTILATOR TILES 6118-AEW-XX-XX-NBS-A-01
• Ventilator tiles:
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.
- Requirement: To ventilate roof void; site specific.
- Positions: To ventilate roof void as follows: site specific.

RotF generic (intermediate) NBS 2014