Can you repair ductwork yourself?

Yes, you can repair and seal accessible sections of your home's ductwork yourself as a DIY project, provided you have safe access to the ducts in an unconditioned basement, crawlspace, or open attic area. To perform effective DIY duct sealing, you should avoid standard cloth duct tape because it degrades rapidly under temperature swings; instead, use UL-181 approved aluminum foil mastic tape or brush-applied liquid water-based duct mastic paste to coat all visible joints, seams, and takeoff collars securely. However, repairing major structural damage, replacing crushed runs, or sealing hidden ductwork buried inside walls, between floors, or deep within inaccessible attic spaces is extremely difficult without specialized professional equipment. You can troubleshoot by checking for air drafts around joints. You can verify that your DIY sealing is successful when supply air pressure increases and energy bills drop.