Control of Materials

• It is necessary that the contractor should arrange for all deliveries & documents to be checked carefully to make sure that the materials delivered to the site comply with the specifications or samples .
• Sometimes it may be desirable to test the samples in addition to visual checking .
• Materials which do not comply with the specifications should be rejected .
• The contractor may be tempted to substitute inferior materials rather than have such delays . This should only be allowed with the approval of the designer .