![]() While professional HVAC tapes can stand the test of time, they tend to be a more expensive option than mastic sealant. Do your research first before purchasing the one at your home improvement store. High-quality HVAC tapes can be hard to find. If you do use tape, look for mastic, butyl tape, foil tape, or other heat-approved tapes that have the Underwriters Laboratories (UL) logo. Despite the mess, mastic is more durable and preferred by most contractors. Aluminum Foil TapeĪluminum foil tape (aka “plenum on a roll”) is easier and less messy, but it tends to fail faster due to delaminating and dirty, oily ducts. If there are any gaps larger than ¼ inch, use fiberglass mesh tape and mastic. Some people like to use a caulk gun for the mastic, but it’s not necessary. You will need various sized paint brushes (1 inch to 3 inches), drop clothes, heavy rubber gloves, and old clothes. Make sure the tape matches the sealant being used. It is usually applied with a simple paintbrush.ĭepending on the leak, you may also need fiberglass mesh tape as well (gap of 1/4 inch or more). You can find this gooey duct sealant at your local home improvement store. Mastic sealant is messier, but more effective. If you are considering taking on duct sealing as a major project, we highly recommend a professional assessment. Warning: While minor duct sealing can be performed by the homeowner, only qualified professionals should seal and insulate ducts in unconditioned spaces. Duct tape since tends to peel and doesn’t last very long. If you don’t want to spend the money on professional duct sealing and insulation right now, consider air sealing the ducts as a DIY project using mastic sealant or HVAC tape (NOT duct tape!). Your technician will be able to seal all the leaks in your duct system (even the unreachable sections), but they can also clean and insulate them as well for added efficiency and improved indoor air quality. ![]() Learn how our PureFlow™ Duct System works. While you can attempt to DIY seal your air ducts, for the most comprehensive duct sealing, contact a professional HVAC technician. To reduce air loss and increase energy efficiency, it’s recommended that you seal all the joints and add insulation around ducts, especially in unconditioned spaces. Are your ducts leaking? On average, your air ducts leak around 20-30% of your conditioned air ( Energy Star).
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