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325 FIRE SEPARATING WALLS
• Separating walls: Completely fill space between top of wall and underside of tiles
with mineral wool quilt to provide fire stopping.
• Boxed eaves: Completely seal air paths in plane of separating wall with wire
reinforced mineral wool, not less than 50 mm thick, fixed to rafters and carefully cut
to shape to provide fire stopping.

345 VENTILATED EAVES WITH INTEGRATED GRILLES/ TRAYS
• Fascia grilles and ventilator trays:
- Manufacturer: Contractor's choice.
Product reference: Contractor's choice.
- Fix to carry underlay, form drip into gutter and provide free passage of air over
insulation.
• Undercourse and first course tiles: Fix with tails projecting 50 mm over gutter or to
centre of gutter, whichever dimension is the lesser.

365 UNVENTILATED EAVES
• Underlay support: Contractor's choice.
• - Continuous to prevent water retaining troughs.
• Gutter: Dress underlay or underlay support tray to form drip into gutter.
• Undercourse and first course tiles: Fix with tails projecting 50 mm over gutter or to
centre of gutter, whichever dimension is the lesser.

435 CLOAKED VERGES
• Underlay and tiling battens: Carry over full width of verge. Project underlay to turn
down behind verge tiles.
• Cloaked verge tiles:
- Product reference: Contractor's choice.
- Projection beyond face of wall (maximum): 50 mm.
- Fixing: Nails and clips.

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.
- Fixing: site specific.

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.

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