What are the worst roof shingles?

The worst roof shingles are generally considered to be cheap organic mat three-tab shingles, no-name imported shingles, and older problematic lines that had documented failures. Among major categories, the worst are basic three-tab shingles made with organic felt mat rather than fiberglass, which are prone to cracking, curling, and early failure within 12 to 15 years, and are rarely used today. Cheap no-name or private-label shingles imported from overseas with no established manufacturer warranty, often sold online or at discount building supply stores, are considered worst because they have poor granule adhesion, inconsistent quality, and no warranty support. Historically, the worst rated shingles included Atlas Chalet from the early 2000s, which had a class action lawsuit for premature cracking, and Owens Corning Organic shingles from the 1990s that also had lawsuits for premature failure. IKO shingles, particularly older IKO three-tab lines, have been cited by some contractors for higher rates of granule loss and shorter lifespan in certain climates, though modern IKO Cambridge architectural shingles are improved. Three-tab shingles in general are considered worse than architectural shingles because they are lighter, have lower wind ratings around 60 to 70 mph, shorter lifespan of 15 to 20 years versus 20 to 30 for architectural, and less dimensional appearance. For best results, avoid any shingle without a lifetime limited warranty, without algae protection, and from a manufacturer without a strong contractor certification program.