Neighbors roof across the street, Certainteed shingles.
Do a quick google search on certainteeds class action lawsuit and do some reading on them, they screwed over millions of homeowners nationwide with junk product that self destructed. Plenty of cases proven in court where even Certainteed had their "investigators" on site looking for every reason to point the blame elsewhere, as with proper intake/exhaust of attic space, insulating methods of particular ceilings, etc....fingers kept pointing back at them until they admitted a problem, and then offered a few hundred to homeowners to fix their roofs LMFAO!!!
As for the "certified", well, as we all know to get certified it's a matter of taking a test and boom, all of a sudden you have a piece of paper allowing you to claim a leg up and with most roofing cert's it allows the installer to offer a longer warranty period based on brand they're installing. It's nothing more than a marketing gimic, pure and simple. Anybody that thinks it's anything but is foolish for the simple fact anybody can get it that is willing to put in the time. Years ago i entertained getting certified for various products we use consistency, but just as many prior "good idea's" I had over the yrs to use for marketing, it made no sense to waste my time and money doing so. We already stand behind the product labor wise, we dont mass market, we're simply word of mouth so my warranty is "as long as you own your home" you call if you have a question or problem. Same with product, we use what we use because IF and WHEN there is a problem, I make a call to a rep and they set the wheels in motion to remedy the situation.
A professional install is a professional install...that piece of paper does'nt mean a fricken thing since if a claim is made, the manufacturer sends a rep out to review how product was installed anyhow before determining if they have any reason to stand behind their problem or call for a "installed wrong" card. To date, all of the problems we've had with other certainteed products, they've taken care of them....mainly in the siding side of things with bad batches or mixed batches and colors being off/sheen being different.
not taking anything away from you personally for going taking the time to get cert., but it does'nt hold much water for me since each manufacturer has destructions on how they want their product installed and stipulations behind install....you vary from it, you bought it...it's your baby at that point in time. So proper install is a proper install, no if, and's, or but's about it.