How to start an insulation contractor business in 2026: attic, wall and crawl space insulation and air sealing, fiberglass, cellulose, spray foam and rigid foam, the FTC R-value Rule’s disclosure requirements, spray foam and isocyanate safety, vermiculite and asbestos, attic hazards, BPI certification, the end of the federal 25C credit and state rebate programs, a worked profit example and a 90-day plan.


