Asphalt shingles warranty overlap in most cases, asphalt manufactures does not provide a longer warranty. As such, mold and mildew are not covered by this limited warranty or any implied warranty. Damage caused by lightning, hailstorm, earthquake, fire, explosion, flood, or falling objects is not covered. Misuse, abuse, neglect, or improper transportation, handling or storage of the shingles” may be cause for loss of warranty.
On the same side, metal shingles cover a valid and longer warranty, provide a 40-year paint warranty. The worst-case scenario with a failed warranty on a 4Ever metal shingle is cosmetic, your roof will not leak, and it will last 100 years or more.