Proper roof ventilation has been known to extend the service life of a roof. Whether it is because it has a direct effect on the shingle themselves or on the other components such as the roof deck is uncertain. For more information on attic ventilation, click here . The warranties will cover defects such as thermal splitting, some cases of granule loss, cupping, and curling. It is very important that you ask for and receive a copy of the manufacturer's written material warranty before making a decision on whose material you'd like to use.
Warranties are generally for materials only .
Labor is rarely included so if your roof materials fail, you'll have to pay a roofer to install the new shingles. If anything on the inside of the building gets damaged, you or your insurance company will have to pay for it. Warranties are also commonly prorated and non-transferable. This means that if you have twenty year shingles and they fail after ten years, you'll be reimbursed for half the cost of the materials. Non-transferable means that if you sell your house, the warranty will be voided.