Even when you hire a professional roofer who provides you with excellent workmanship on your roof structure, you will still need to do your part by allowing them to conduct regular maintenance checks. Ask your friends, family and coworkers if they can recommend someone for a roof estimate. This is one of your very best sources because these are the people you know and trust. Self-tapping roofing screws are essential for simplifying metal roofing installation which has neither been factory pre-drilled nor dimple, because they are both faster to secure and reduce the risk of injury from snapped screws