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F30 Accessories/ sundry items for brick/ block/ stone walling

CAVITIES

110 CONCRETE FILL TO BASE OF CAVITY
• Concrete generally: To BS EN 206-1 and BS 8500-2.
- Designated concrete: site specific dependant on ground conditions.
Workability: High.
• Extent: Maintain 75 mm between top of fill and external ground level and a
minimum of 225 mm between top of fill and ground level dpc.
• Placement: Compact to eliminate voids.

120 CLEANLINESS
• Cavity base and faces, ties, insulation and exposed dpcs: Free from mortar and
debris.

132 PERPEND JOINT PLASTICS WEEP HOLES
• Manufacturer: Contractor's choice .
- Product reference: Contractor's choice .
• Locations: Through outer leaf immediately above base of cavity, at cavity trays,
stepped dpcs and external openings.75 mm above top of cavity fill at base of
cavity.
• Provision: At not greater than 1000 mm centres and not less than two over each
opening.

150 FULL FILL CAVITY INSULATION
• Insulation: Rock wool batts.
- Standard: BS EN 13162.
- Product certification: British Board of Agrement (BBA).
• Manufacturer: Contractor's choice.
- Product reference: Contractor's choice.
• Recycled content: Submit proposals.
• Face size (nominal length x width): appropriate to suit site specific details.
• Thickness (nominal): min 60 mm - site specific to suit thermal requirements.
• Thermal conductivity: typically 0.035 W/mK - site specific .
• Reaction to fire class: A1.
• Additional requirements: None.
• Placement: Continuous and free of mortar and debris.

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