I overstated myself here. What I meant is that for residential / small - midsized commercial buildings only, QC/defects are not as large as a concern. Prefab c

I overstated myself here. What I meant is that for residential / small - midsized commercial buildings only, QC/defects are not as large as a concern. Prefab components I was thinking about was prefab wall / roof / floor trusses like these http://www.buildwithbmc.com/bmc/Products/Trusses%2C-I-Joists-%26-Engineered-Lumber/Trusses-%26-Prefabricated-Wall-Panels/c/Trusses-Prefabricated-Wall-Panels http://www.buildwithbmc.com/bmc/Products/Trusses%2C-I-Joists... Bridges are a different story all together.