In the scenario above there is the case of defects appearing in the floor screeds which have already been paid for by the employer. The architect is able to and must correct such valuation errors in subsequent interim certificates.
In clause 4.16.1 reference is made to work properly executed this means that no defective work should be included in the valuation. However, a Contractor may try to use this clause to claim that, if works have been included in an Interim Certificate, it is evidence that they have been accepted and are free of defects. This is not the case as clause 3.6 states the contractor shall remain wholly responsible for carrying out and completing the works in all respects in accordance with the contract documents and that responsibility shall not be affected by the architect including the value of any work materials or goods in a certificate for payment……(short extract)

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