A roofer installs, replaces, and repairs the roofs of buildings. As a roofer, you work with materials like shingles, tar, and metal. Your duties include working on both the ground and on top of buildings, often at a slope. You use tools for roof installation and conduct assessments of roof conditions. You might give a customer an estimate, apply a waterproof coating, or replace an entire roof. You work with certified building contractors and operate under a business license in both commercial and residential settings. Typically, an inspection follows each job.