Duct Sealing

Sealing your home against air leakage is one of the most beneficial upgrades you can do to increase your comfort and lower your bills. Air leakage accounts for 40% of heat loss and gain in the home. Sealing and insulating your ducts greatly increase the efficiency of your home. 






A duct leakage test is now part of the Energy Code requirements in most improvement cases. State code requires duct leakage be no greater than 6%.

The leakage test helps ensure the work is done properly.

Keep Unwanted Heat Outside by Sealing

Get an energy audit.

Before you prepare to remodel or expand your home, find out how the home is already working. Contact an energy efficiency auditor to test how badly the air ducts leak, and consider getting a “blower door” test to see how much air leaks in and out of the house through cracks, outlets, windows, and doors.

What can you do about it?

Seal and insulate existing ducts.

Start by sealing duct leaks using mastic sealant or metal tape and insulating all the ducts that you can access (such as those in attics, crawlspaces, unfinished basements, and garages). Also, make sure that the connections at vents and registers are well-sealed where they meet the floors, walls, and ceiling. 

Funded by the Local Government Strategic Plan Strategies Program

under the auspices of the California Public Utilities Commission.

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