We settle the paperwork before the crew arrives. The Calcasieu Parish Police Jury requires permits before any construction or remodeling, and its list names re-roofing but not insulation, so it isn't settled whether a foam job needs one. Inside city limits, the city Permit Center answers permit questions at 337-491-1294. We check with the office that covers your address, apply if a permit is needed and keep you posted.
The state also sets who can do the work. In Louisiana, a home improvement job valued over $7,500 and up to $50,000 has to be bid or done by a home improvement registrant or a licensed contractor. At $50,000 or more, or with any structural work, it takes a licensed Residential Building Contractor, so ask to see that before anyone sprays.
On jobs around Lake Charles, Sulphur and Moss Bluff, we often find ductwork in the attic and existing roofs that weren't built for more vents. Cutting new vents at the eaves may not be wise this close to hurricanes and often isn't practical on an existing house, which is one more reason foam at the roof deck fits some homes here.