Unfortunately it usually takes something tragic to change poor work practices. If I was in anyway responsible for that work, be it installer, foreman, supervisor, i would bring this to the attention of those above me and keep moving up the ladder until the issues or individuals were addressed. However that creates another choice, do you raise this issue at the expense of you job and current means of supporting your family? I take my trade seriously and proudly stand by my workmanship, however I have had the great fortune of working with and for people who have put quality ahead of the job making a few more bucks. I've just accepted that I can't ever be cheaper on an install that some of these contractors and employees that do substandard work. I would like to believe that in the long run I offer more value.