Commercial caulking jobs focus on large-scale caulking projects, such as helping make the roof of a building waterproof as part of a larger construction project. In this field, you may help repair damaged or old caulking, select the best materials to use in any given area, and use various tools to apply caulk and seal the designated areas. Commercial caulkers frequently work outdoors, though clients may occasionally ask you to seal indoor areas around sinks, toilets, and other areas that may face water exposure. Most commercial caulking jobs work by the linear foot, rather than time spent, so learning how to be the most efficient when caulking is essential to your success in this field.