Roofing contractors put on & usually need formal education, but they require on-the-job experience to learn their trade. While each state has different licensing rules, the majority of require a roofer to have at least 2 years of experience prior to they can become certified. These professionals also require liability insurance coverage, to be bonded and to possess a business license. HomeAdvisor can assist you discover the best roofing contractor for your job. While each state has various licensing guidelines, a lot of require a roofing professional to have at least 2 years of experience prior to they can end up being certified. These professionals also require liability insurance, to be bonded and to possess an organization license.