Duct sealing is the process of closing air leaks in ductwork joints, connections, and holes to prevent conditioned air from escaping into unconditioned spaces. Sealing reduces energy loss, improves system performance, and ensures designed airflow reaches occupied spaces. This work is critical for achieving Title 24 compliance and energy code requirements.
Sealing Techniques and Materials
Technicians apply duct mastic, aeroseal, or metallic tape to seal leaks identified during Duct Blaster testing. Mastic sealant remains flexible and creates a long-lasting bond, lasting 20-30 years. Aeroseal technology pressurizes the duct system with sealant particles that adhere to leak locations from inside, ideal for inaccessible ducts. Proper sealing must achieve leakage below 8% per Title 24 standards at 25 Pascals of pressure.
Energy and Code Compliance
Sealing ductwork reduces conditioned air loss from 20-30% to below 5%, improving efficiency by 10-20%. Sealed systems require less run time to reach setpoint temperatures, reducing equipment wear and extending lifespan. Duct sealing is mandatory for Title 24 compliance and strongly recommended by EPA and ENERGY STAR. Testing documentation proves compliance for permit approval and occupancy clearance.