1.) Installation by unqualified or inexperienced installers.
2.) Use of noncompliant materials used within the system. (e.g.: Using a non-approved foam board or mesh.)
3.) Manufacturers like to substitute liquid or hard components without notifying the organizations who approved their original system for use (i.e: ICBO ES) in their original test report data.
4.) Withholding identification components used in production.
5.) Not installing the system (by qualified applicators) per the manufacturers specifications.
6.) Adding, deleting or modifying a production process without testing and approval.
7.) Identifying their system or system components as being approved to the public.
8.) Improper identification of materials.
Just a few mentioned here. While many of my comments appear to be similar in nature, they are not. I can't divulge too much detail, but I have audited many of these manufacturers. The big guys and little guys, I don't trust any of them after getting a worm's-eye view of thier operations. Never left an audit without corrective action.
Actually had one tried to bribe me.
Hmmm.