Standard practice - but officially illegal. Let's see how they explain that.

My father was an architect, designing middling-expensive public buildings for the New Zealand Government. NZ buildings often use timber, both because of availability and for earthquake resistance. But you want anything big to be adequately fireproof. He once got a report back from his clerk of works (construction manager, sort of) that he'd visited the site and found the workers brewing up their tea over a fire made with scraps of the "fireproof" timber. The supplier didn't get to do that again.