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PREPARATION/ INSTALLATION

310 INITIAL SITE TESTING OF PROOF LOADS FOR WALL TIES for the appropriate
• Timing: Before commencing wall tie installation.
• Tensile proof loads of wall tie fixings:
- General: Do not test wall ties until they have been installed
periods recommended by the wall tie manufacturer.
- Locations: Submit proposals.
- Testing: Give adequate notice.
- Separate tests (minimum frequency):
Internal leaf: Three tests.
External leaf: Three tests.
- Proof loads for internal and external leaves
(minimum): as BRE Digest 401 recomendation.
- Test failures: Obtain instructions.
- Completion of satisfactory testing: Submit results.

315 PROOF LOAD TESTING OF WALL TIES DURING INSTALLATION
• Timing: During installation and before making the external leaf connections.
• Tensile proof loads of wall tie fixings:
- General: Do not test wall ties until they have been installed for the appropriate
periods recommended by the wall tie manufacturer.
- Testing: Give adequate notice.
- Proof load test frequency (minimum):

Number Minimum Allowable failure

of ties test rate rate of tested ties

The first 20 % 100 % 10 %
21–250 10 % 5%
251–1000 5 5%
Over 1000 2.5 % 5%

Locations: site specific .
- Proof loads for internal leaf (minimum): as BRE Digest 401 recomendation .
- Test failures:

First sample set failure rate exceeds 10%: Repeat the proof test on a further
sample set.
Combined failure rate of both sample sets exceeds 10%: Obtain instructions.
Ties that fail proof load test: Replace in suitably adjacent location and retest.
- Completion of satisfactory testing: Submit results.

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