Sarnia part of the problem is that most of these projects go out to competitive tender, so if a construction company wants a particular project it has cut the price to the bone to get the job in competion with other construction companies doing exactly the same thing.
The client, especially government/council clients, want the project to cost as little as possible and are inclined to place price above almost everything else in assessing competitive bids.
So the constructor, having made a low, almost profitless bid for a project - and won it - then has to build the project as cheaply as it can, in order to make any profit, or even merely avoid making a loss, and has to cut corners on the construction, left, right and centre.
I know it is nice and comforting to think cutting corners means rich companies and individuals (evil, bad, dishonest, and utterlt despicable, as they always are) lining their pockets, but often it is a question of bidding low and then desprately trying not to make a loss.
Look at the number of, especially state, contracts that are delayed because the construction company has gone bust. There was a big hospital in Liverpool, I think, that is years behind completion because of that.
That pockets get lined, is undeniable, but that is usually by directors who are doing that regardless of how profitable the company is. Many directors of bust companies have done that hurriedly the year before the company fails.
The real problem and the cause of much of the cost cutting, which is done by site and project managers. is because the company made an unrealistic bid because they wanted the job, and the jobs of senior site management depends on them making some kind of profit out of the project and this cascades down the site team.
The other problem Sarnia, is that because construction companies do run on this margins and go bust, the company that installed the cladding has often gone bust years before the problem becomes evident.