I would not get to hung up on the length of the warrenty by the installer and let this be the deciding factor on who you hire to do the job.
They could put anything they want, but it's only as good as the installer and if there even still in business.
If a new roof is going to fail in most cases you'll know within the first year.
They could put anything they want, but it's only as good as the installer and if there even still in business.
If a new roof is going to fail in most cases you'll know within the first year.