Do you know what to expect out of the workmanship warranty that your roofer hands you at the completion of the roofing project? You should expect that your roofer will stand behind it and that in the event a leak occurs, the roofer will respond quickly to correct the problem.
Your roof should not leak once the roofer walks off at its completion. If it does, he must respond immediately. The measure of a good roofer is not how he conducts himself when there are no problems; but how he conducts himself when he is faced with a problem.
As long as you hired a professional roofer, he is fully aware of how to install the roof and all the detail areas so that it will not leak or fail for the foreseeable future. He is banking his license and livelihood on it. The State is very specific about how a certified roofer is to perform his trade. He is responsible to the State legally and responsible to you civilly.
One of the best methods to help insure that your roof will not leak after your roofer completes it is by asking him to inspect every area on the roof before he leaves the job for the last time. He should do this automatically every night after the work has ceased. A final inspection with you on the ground and present should be enough to cover all the workmanship as a final walk through. This inspection should not be done hastily but rather thoroughly in its context. We can represent you by joining the roofer on the roof and question all the installation methods used as well as how the flashing details are finished. We can address any area of your concern and make sure it will function properly. This can be your best assurance that the roof you bought is properly complete before you make that final payment.