Normal quality control measures are appropriate for most normal structures. However, there are some structures that may require much more stringent quality control. This can be set in the product specification.
For example, in the exhibition hall for the Sydney Showgrounds at Homebush Bay each finger joint in the laminated beams used as the structural skeleton for the dome was proof tested prior to lamination of the beams. This provision was included in the specification for the timber and contributed to the cost of the structure. However, it gave the client and the designers an assurance that the product would perform as expected.
Similarly in appearance products, special jobs may require special checking. For example, panels used as lining in the Australian Parliament house had specifications that included very tight tolerances on moisture content, and very tight colour requirements. Colour matching cards were used at all stages of production to ensure that only products with acceptable appearance would be seasoned and machined.
These unusually demanding jobs ended up paying a premium for the timber and the quality control that was used, but the product was exactly what was required.
