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560 EXISTING EDGE TRIMS
• Fasteners: Check security. Replace as necessary.
• Existing coverings: Cut out from edge trim recess sufficient to accommodate
coatings.

565 EXISTING GUTTERS/ OUTLETS
• Dirt, debris and build up of previous coverings/ coatings: Remove to restore free
flow of water.

570 EXISTING CRACKS/ GAPS
• General: Rake out, clean and make good with sealants or repair systems
recommended by coating manufacturer.

575 FINAL POWER WASH TO EXISTING COVERINGS
• General: Water jet clean all areas. Allow to dry.

580 STERILIZATION TREATMENT TO EXISTING COVERINGS
• Preliminary work: Complete including making good and cleaning down.
• Biocidal solution: Apply to all areas previously subject to organic growth. Allow to
dry.

NEW SUBSTRATES/ VAPOUR CONTROL LAYERS/ WARM DECK ROOF INSULATION

610 FIXING TIMBER TRIMS
• Fasteners: Sherardized steel screws.
• Fixing centres (maximum): 600 mm.

620 LAYING OVERLAY TO METAL DECK
• Setting out: Lay boards with staggered joints and long edges at right angles to
troughs in deck.
- Joints: 1 mm per metre panel size.
- End joints: Centred over crowns of deck.
• Fasteners:
- Type: As recommended for purpose by fastener manufacturer.
Fixing centres: One fastener per crown along each long edge and at 300 mm
centres along every alternate crown.
- Fastener heads: Flush with, or below board surface.

630 LAYING VAPOUR CONTROL LAYER
• Membrane: Loose laid, flat and without wrinkles.
• Laps: Sealed using materials and method recommended by membrane
manufacturer.
• Upstands, kerbs and other penetrations: Enclose edges of insulation. Lap with
coatings to form a complete seal.

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