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FREE Shipping by Amazon. These are the bulky, gray box-shaped ducts so common everywhere. You may have occasion to measure the size of the ductwork. Measure the circumference of the duct, add 2 in. Apply a long strip of foil tape along the seam in the insulation. If you want to insulate the rectangular ducts, knock yourself out. If you decide to proceed without testing your ducts, perform a thorough examination, looking for any rust, holes, severely damaged pieces, loose connections or missing portions, starting at the furnace and air unit and working back to the very last register in the home. Then remove 1 1/2" of insulation to staple. The insulation is quite low around R-4, and also has many tears and rips, and the ducts need to be air sealed. Tape any punctures in the insulation’s vapor barrier to prevent leaks. 3. Repeat to insulate the remaining ducts. Your joists or wall studs may actually form the “duct” run if a portion of your HVAC ductwork is missing — or the air may simply pour out to the exterior. These products are easily cut and fitted to achieve a neat, thermally effective insulation blanket over the exteriors of rectangular, round, oval, or irregularly shaped ducts. Please enter your email address. Wrap the insulation around the duct, and then pinch the seam closed. Although flexible ducts don’t require further insulation, they are vulnerable to damage, especially punctures. 1. Only a professional has the equipment and knowledge required, so it’s really not a DIY-friendly task. Cutting fabric-covered, heat-proof foam to fit the interior of your ducts is a low-cost, simple way to get the insulation and sound reduction you want. Measure and cut your insulation so there is a small overlap. Use a utility knife to cut foil-faced fiberglass insulation to the proper size. The dollars and cents that go into moving vary greatly depending on a number of factors. 9. Lost your password? Also look for energy efficiency credits that may be available through the utility company or the state or federal government for testing and insulating your ducts. x … In the end, it’s probably best to buy the blanket insulation. I would like to replace the insulation with R-8. Cut the insulation to width and length, using a square and a sharp utility knife, so that it fits snugly around the duct without compressing the fiberglass. Wrap the insulation around the duct, allowing the beginning edge to ride up slightly over the previous piece. Ductwork is found in square, rectangular or round form. 99. Generally called a duct blower door test, the technician seals the air intake and outlet registers before blowing air through the system. In general, only use the tape by itself when you have no other choice. Often used in tight spaces, such as in walls and ceilings, rectangular duct allows you to select larger sizes without increasing duct height. Silicone caulk will work in small areas. However, if the ducts have a lot of leaks, the air that makes it to your rooms will not be as warm or as cool as intended. To install sleeves, you must either disassemble the ductwork and slide it on before reassembling the ducts or — as many homeowners find themselves doing — slit it and wrap it around like the blanket-style material. Talk to others about what works for them and shop around before choosing any insulation for any part of your home. Fibrous glass duct wrap insulations are manufactured to comply with ASTM C 1290, Flexible Fibrous Glass Blanket Insulation USed to Externally Insulate HVAC Ducts. After reinsulating all ducts to R8, I plan to bury them in blown cellulose insulation, based on the report Compact Buried Ducts in aHot-Humid Climate House. For larger square or rectangular duct I add the four sides up then add 6. Before beginning, read the product instructions and follow wherever they deviate from general duct insulation guidelines: Once your ducts are sealed and insulated, you can have a technician retest your ductwork if you desire. When the tape is used with the mastic, however, it works very well. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. strip of fiberglass to create an overlapping flap for taping (Photo 1). You may also want to know the measurements to accurately calculate the amount of airflow moving through the duct. Mark problem areas with a marker or chalk. Duct board, much like the duct liner, is also a fiberglass product. Rectangular Duct and Fittings . All rights reserved. 3. My vented attic in Virginia has a straight 28ft of 12" x 8" rigid rectangular trunk duct with seven 6" branches. As new and innovative products arise continually, these are by no means the only types of duct insulation available, nor will they remain the main types. strip of foil, and secure it with aluminum tape (Photo 2). It also keeps the heat out of the home (or duct). I have expressed a few of the articles on your blog now, and I really like your style of blogging. UniTherm Ceramic Fiber Insulation Blanket R-Value: 2.27 (6# Density, 2300°F) (1 in. So duct loss matters no matter what. Holes, leaks and gaps closer to the HVAC unit encounter higher air pressure than those farther away, so your greatest savings and increase in efficiency will come from sealing well at and near the unit. Cut the insulation with the utility knife in sections 2 inches larger than the circumference of the duct. The higher the R-value (literally meaning resistance value), the better the insulation works. Do what you’re comfortable with — if you feel confident about doing the sealing yourself, it will be messy. Gently pull the insulation over the entire length of duct. Use a stiff-bristled paintbrush or your fingers to spread the sealant. In the average home, around 20% to 30% of the heated or cooled air flowing through the ducts is lost to leaks and uninsulated surfaces, according to the Department of Energy. Tom Silva and Jeff Sweenor install a drop finial and a swinging window. Another product, known as flex duct, is a round framework of wires coated with fiberglass and encased in either foil or plastic to resist moisture and air leakage. 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