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505 DRY HIPS
• Underlay: Lay courses over hip.
- Overlaps (minimum): 150 mm.
• Dry hip fixing battens: site specific.
• Roof tiles: Cut and fix closely at hip.
• Dry hip tiles:
- Manufacturer: site specific.
Product reference: site specific.
- Accessories: site specific.

525 MITRED HIPS
• Underlay: Lay courses over hip.
- Overlaps (minimum): 150 mm.
• Mitred tiles: Cut double tiles or tile and a half tiles and fix through weathering unit
supplied by tile manufacturer to form a straight, close mitred junction.

615 METAL VALLEYS
• Underlay: Cut to rake. Dress over tilting fillets to lap onto metal valley. Do not lay
under metal.
• Roof tiles: Cut adjacent tiles to fit neatly.
- Bedding: On mortar on fibre cement undercloaks laid loose each side of valleys.
- Valley width between tiles: 100 mm.

625 TROUGH VALLEYS
• Underlay: Lay strips not less than 600 mm wide centred on valleys. Overlap with
general roof underlay.
• Valley battens: Fix to raise tiling battens and lift roof tiles clear of trough tiles.
• Valley trough tiles:
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.
• Roof tiles: Cut adjacent tiles to fit neatly.
- Bedding: On mortar on trough tiles. Keep trough tile interlocks and water
channels free of mortar.
- Valley width between tiles: 100 mm.

660 SIDE ABUTMENTS
• Underlay: Turn up not less than 100 mm at abutments.
• Abutment tiles: Cut as necessary. Fix close to abutments.

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.

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