Roofers
Roofers work with shingles, tile, metal and flat membranes, and not every roofer does every material, and the best fit is usually someone who works with your type of roof every week. The mix of work a company does affects what it is best at, so ask what fills their calendar, and the answer is usually clear within a minute. The craft combines carpentry, sheet metal work and a feel for water, so ask how new crew members are trained. Knowing who does what saves confusion once work is under way, and everyone should work from the same written scope. Ask which model you are dealing with so there are no surprises about who turns up, and the answer shapes how you communicate.
