How To Seal And Insulate Ducts

Posted on: 9 April 2016

Modern furnaces have great energy efficiency, especially if you choose an Energy Star rated product. However, no matter how efficient your furnace is, you will lose a lot of heat and waste a lot of energy if your ducts are not fully sealed and insulated. To adequately seal and add insulation, you will need to do the job before the drywall is installed. This article explains how to seal the ducts seams with aluminum foil tape and how to install thermal bubble rolls for extra insulation.

Taping the Seams

No matter how tight the seams feel when attaching the duct, air will almost always be able to escape. Also, over time the ducts could shift and move, causing the seams to become lose. This is why adding tape is so important. First, make sure you use aluminum foil tape instead of duct tape. Duct tape is great for lots of things, but surprisingly, not for air ducts. Foil tape will create an air tight seal. Double-tape each seam and push down very tight so no air can escape.

Adding Thermal Bubble Insulation Rolls

Thermal insulation rolls can definitely help with heat loss. This job is much more time-consuming than taping the seams because you need to cut each piece to fit in between the stud bays. You can speed up the job if you buy a product that is wide enough to wrap around the entire duct. Otherwise, you can to wrap the ducts sideways, and this means smaller pieces, more cuts and more taping. Since most studs will be equidistant, you can cut more than one at once. The rolls can be cut with normal pair of scissors or a utility knife. You should also use aluminum foil tape instead duct tape for a better hold and more insulation.

Add tape to the entire edge, then wrap the roll around the duct and add tape to the other edge. The key is to overlap the rolls a few inches and tape tightly across the entire seam. You can also tape the edges together if there are every 2 pieces that are not separated by a wooden stud.

These two simple jobs are cheap and quick, but they will definitely lead to a more energy-efficient heating (and air conditioning) system. You can do the work yourself, or even request that your contractor has it done before the drywall is installed. Contact a company like West Country Heating & AC for assistance.