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C46 Cavity wall tie renewal/insertion

GENERAL REQUIREMENTS

105 SURVEY OF EXISTING CAVITY WALLS
• Timing: Before starting remedial work covered in this section.
• Purpose: To confirm nature and extent of remedial work to wall ties.
• Survey report: Submit, stating:
- Form of construction, materials used and condition of walls.
- Thicknesses of internal and external leaves.
- Widths of cavities.
- Nature and extent of remedial work including requirements for additional ties at,
e.g. sloping verges, movement joints and openings.
- Schedule of services, fixtures and finishes requiring removal to facilitate renewal
of wall ties.
- Any other information considered relevant.

110 INSERTING CAVITY WALL TIESgenerally
• Existing cavity wall construction: site specific.
- External leaf: site specific.
- Internal leaf: site specific.
- Cavity width: site specific.
• Existing ties: site specific.
- Treatment: Remove completely.
• Remedial cavity wall ties:
- Type: Stainless steel expansion tie with PVC sleeves.
- Manufacturer: Contractor's choice.
Product reference: Agrément certified.
- Diameter: Contractor's choice.
- Length: Site measurement.
- Proof load testing: As report.

GENERAL REQUIREMENTS

220 SAMPLES FOR REPAIRS TO EXTERNAL LEAF
• Obtain approval for the following before completing the remainder: site specific
sample requirements.

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