A roof needs regular check-ups in the form of regular inspections and prompt repairs. Money spent on maintenance every year protects your investment and prolongs the life span of your roof. Studies have shown that a roof not regularly maintained, will only last about half of its expected service life.
A warranty is not enough to protect your investment, as almost all roofing material manufacturerers' warranties state specifically that their warranty is void if the roof is not maintained. If you cannot show that the roof has been maintained, you will have no claim on a warranty issue.
If you see any signs of leaking, like dark spots on a ceiling, mold or dampness occuring, then take action immediately. Roof leaks only get worse, protect your investment and increase the life span of your roof by spending money on maintenance. The alternative is, expensive repair or total replacement.
Maintaining and repairing your roofing system will insure that it lasts as long as possible.