Fuck everyone involved, the dickheads involved should be held personally responsible for this. Fine the project manager, inspector, foreman, even the tradesmen who actually did the work.

But they were just doing what they were told

Bullshit, when your foreman tells you to build a subpar house, a house that you know someone is going to have to live in, you tell him to put it in writing. Your foreman would literally sell you by the pound if the opportunity ever came up. If enough guys wave down inspectors and get this shit caught before the house is sold it will no longer be profitable to build shitty houses.

Bias: I am an electrician, I worked for 7 years in commercial/industrial construction and 12 years in industrial maintenance/service. If I do sub standard work people can get hurt or killed. Sometimes I have to remind the bean-counters that a dead employee is a lot more expensive than the vital part I need to make a machine safe.