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How to Air Seal Ductwork | How To Seal HVAC Ducts | Duct Air Seal DIY | Air Duct Sealing DIY
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- Опубліковано 15 січ 2016
- 🏡 Ready to enhance your home's energy efficiency? Dive into our guide, "How to Air Seal Ductwork | How To Seal HVAC Ducts | Duct Air Seal DIY | Air Duct Sealing DIY"! 🌬️🔧
Join us as we unveil the secrets to sealing HVAC ducts like a pro, reducing energy waste and improving indoor comfort. 💡🏠 Discover step-by-step instructions and expert tips for DIY air duct sealing, saving you money on utility bills and enhancing your home's performance. 💰♻️
Learn essential techniques for identifying and sealing air leaks in ductwork, from using mastic and foil tape to sealing gaps and cracks effectively. 🛠️🔍 Plus, unlock insider knowledge on common duct sealing mistakes to avoid and ensure optimal results. ❌🚫
Whether you're a seasoned DIYer or new to home improvement projects, our video provides invaluable information to empower you in sealing your HVAC ducts with confidence. 🛡️😌
Don't let energy loss through leaky ductwork drive up your utility bills! Click now to watch the video and take the first step towards a more efficient, comfortable home. 🎥✨ Don't forget to share your thoughts and questions in the comments below - let's seal those ducts and save together! 💬🌬️ #AirDuctSealing #HVACDucts #EnergyEfficiency #DIYHomeImprovement 🏠🔍
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Every leak I seal up in my 98 year old house pays me money from the moment I close it off. I can smell the savings!! I'm always working on lowering the cost to keep this place warm. It's my favorite hobby.
That's great advice, thank you for sharing.
Have watched a few different HVAC repair videos in preparation for my own fix in our crawlspace; this was the most helpful ones.
As payment, I am leaving the obligatory comment for the almighty algorithm to consume
That's great. Thank you for the payment of your algorithm comment. I'm glad the information was helpful to you. Thanks for watching. 😅
When we shot this video, we never dreamed it would be our most watched. What other topics could we cover to help you improve indoor air quality, crawl spaces and energy efficiency? goo.gl/W579MH
Do you have or can you make a video, step by step on how to lift/raise an existing HVAC return in attic? I am looking to do this myself. I have one section in my house where the ceiling is really low and this is where the return unit sits. I want to raise the height of this ceiling as well as lift the return unit.
@@allthingsgrowing We do not have any videos like that. I'd recommend leaving that to an HVAC professional or try consulting one to see what they recommend.
I was really happy to see and listen to this! I called an HVAC business for help in sealing the duct from my wood burning furnace. They said they couldn't help me because their insurance would not allow them to work on wood or fuel oil systems. So finding this video and knowing what product to use and how to seal the joints saved me!! THANKS!!
I'm in the UK where NONE has ducted air heating, but I do. Its freek'in cold here and I couldn't work out why the house was cold 5mins after the heating went off. Just looked in the loft (attic) and there was a slit hole ona join that was 18x1" - !!!
I just wedged foam rubber sheet around the duct for now, what a difference! The house is warmer imediately.
Many thanks for the video, as I watched it the coin dropped. I've been freezing for weeks! Happy Christmas dude!!! :D
I appreciate your help and guidance didn't have a dad to help me with anything growing up this is Soo helpful thank you 😁 💯
You are so welcome!
Hey Michael, thank you for taking the time and effort to produce this excellent tutorial and demonstration on how to properly seal duct joints. Your comments on the five reasons for properly sealed ductwork was really on point.
Good to know there are different types of tape. I have bought tape based only being aluminum, not whether it was mastic tape or not...
Just did 8 runs in my crawlspace, decided to take all the duct tape off before hand. It was all old crusty and dusty. Used mastic paste and fibertape. Talk about some physical work phew....
Hey Michael ! Thank You for this video. You explanation was very good and helped a lot.
Glad it was helpful!
Funny how duct tape is great for everything but ducts.
Duct and Duck tape are two different animals.
Long term, it will disappoint - stay with foil.
The original name was Duck tape. The tape was invented in 1943 to seal steel ammo boxes. Later on in the 1950’s it was used to seal air ducts and the name changed over.
Haaaahaaaa 😅 👍 😅@@whizatit
Watched a lot of your videos, but you should take it down to the kd (knock down metal) and seal it with dyna seal
4:55 Actually starts showing what to do.
Nice corn snake you found there at the end of the video!
Thanks 👍
That attic insulation looks quite sparse and uneven. That is a critical factor regarding overall comfort in the home and heating/cooling efficiency. Also the fiberglass blown insulation actually has a lower R-value than cellulose. Things to think about.
This is a through video. I like what you've done.
Thank you!
I am currently sealing my circular ducts using duct puddy to fill in openings and cracks and then applying foil tape (I believe you call it mastic tape in this video) on top of that. There will be a thin layer of insulating wrap applied after that part is complete.
Great, thank you for sharing and watching.
Mike, thanks. I’m going to order some tape for the metal ducts and the insulated ducting and will be patching wherever I can. Also, I didn’t know you were a snake wrangler too!!
Don't forget that your energy company gives out good rebates for this work, even if you DIY. That's why I'm out here to get the terminology down so I can qualify for the whole amount.
Hey mike on work squeegee, lol. Great video, what did you do to the insulation wrap before you taped it, did you wipe it down with something. Another suggestion is spray glue before you tape works really well. Rick from Illinois
Cleveland Brown!! But on the real...love this!
Thank you for an excellent video. 😊👍
That foil tape USED TO BE great, 15 years ago. When you'd peel it back you could smell a super glue like smell from that, then, bad azz adhesive. Todays foil tape won't last a year before it falls off. Use mastic instead to seal ducts. Oh and clean/wipe down before you seal. PS, you need to apply mastic to a nickle coin thickness minimum.
I work hvac and like the noob that I am, they have me sealing. I hate it haha
Dang that's thick!!!
Here metal ducting already installed. But what's your thought's on a rigid PCV or ABS square ventilation duct, rather than metal ducting?
The reason I ask is that this type of ventilation flat duct can be used with self seal connectors.
So mastic tape doesn't need to be used to seal the joints. and you don't have metal seams that can also attribute to some air loss.
No plastic for ducting because of toxic fumes if a fire occurs. Strictly forbidden.
Thank you Mike finally could fix mine
You're welcome, Victor! Thanks for watching! We hope you have a happy & blessed day!
thanks for the video, i have couple ducts that is leaking air from the joint at the unit. I rent out from a house and i think what has happened is occasionally i have to close my vents from other smokers so the air "back tracked" and eventually compromised the vent joint. The ducts are actually zip tied to the trunk outlets and the insulation is "tucked" into the unit. The other ducts are fine but I'll have to use your tape method to fix my ducts. Another question, are vent register filters good for the overall airflow from the unit or do they actually disrupt proper airflow? Thank You.
Let's dive into this together - crawlspaceninja.com/crawl-space-help-faq/
Informative on the best way to seal the trunks!
I need to climb up in my attic and do this. i've got condensation dripping from the seam inside my kitchen vent only. I assume it's an air leak. Last winter i went up there to try and find it and couldn't find the damn run! So much insulation blown in my attic.
Very informative, well done videos. Thank you!
Did you cut new insulation to wrap the ducts or did you use the existing that was there and re- wrap it and re-tape it using it the foil tape? Fairly new home owner in a house that is over 100 years old and trying to cut down on utility expenses. You're video has been very helpful! Thanks
If your house is 100 years old, you might as well forget about effeciency. The ductwork is probably the best thing effeciency wise compared to the rest of the house.
You might be able to get a weatherization assistance group to come out and work on it, but it's hard to bring the numbers in those things down. Insulating it will help, but the main killer is air sealing. Balloon framing is horrible.
Thank you!
You're welcome! Have a blessed day.
Why use the mastic tape? Normal mastic puddy is easy to apply, does a better job filling gaps and is 1/10th the price.
Do you put regular foil tape over the mastic putty or just putty and wala!
Great vid! Are there any self seal duct connectors? We have people in our home that have asthma/allergic reactions with such products
Richard Gonzales crawlspaceninja There are at least some take offs (trunk to run connectors) that I know of that are somewhat self sealing. Found them at home depot for about $5 a piece for 6" take offs. They are gasketed on the contact surface (unlike a standard tabbed takeoff) with four holes for sheet metal zip screws to positively attach and support the takeoff/duct. My local depot stocked the flat take offs for rectangular sheet metal duct, but I do believe they make saddle shaped take offs for round trunks as well. You may have to order those online. Thanks for the video btw! I'm in the middle of this very project in my attic right now!
Good vid. The thing I hate about foil tape is trying to get a thumbnail or blade in to separate the foil from the backing! Especially in an attic or crawl space where there is limited light or you are in some awkward position! However, it is definitely worth the effort
Thank you!
Informative video, thank you! What are your thoughts of using those foam can kits they sell on Amazon that apply 1" over the steel ductwork then wrapping batting insulation? I have a fairly large job insulating HVAC runs in an attic, air sealing penetrations, and blowing more insulation to eliminate ice dams. Your thoughts? Thanks again!
I think the spray foam sealing of ducts is great just a messy project. Adding batts or HVAC insulation, if you have the room, should help too. Thank you for watching.
Thank you, great information
Thanks for watching!
Great video just subscribed...
Another good video, thanks. I’m in the process of incapsulating my Crawlspace and the other day when I was down there the hvac unit kicked on and I noticed massive amount of air coming in from around original crawlspace door gaps. Where’s that air going?
It is possible for leaks in the return and supply lines of your HVAC system to allow dirty crawl space air to enter the ducts. Your living space will then receive this air directly from the system. It is therefore important to inspect your system on a regular basis.
I have a very serious question that I don’t understand why I’ve never seen it not only asked but answered.
The actual HVAC attic air handler unit is all metal, right?.
Why is it not insulated like the bejeebers?.
It would seem to be the ultimate “duct” that would need to also be insulated whether you’re using the furnace or the AC features.
Please elaborate?.
Thank you
It has insulation in the inside
Hey Casmige,
Most air handler units have fiberglass insulation installed on the interior surfaces to provide thermal insulation, absorb sound, and help to provide the quiet operation of the HVAC system. As a whole, if properly maintained, air handler insulation has a long-term life expectancy. Thanks for watching and have a blessed day
Also, try to use the cap from a can or spray paint, or a Bondo squeegee to flatten that aluminum tape....it's like a roll of razor blades, and the tiny cuts hurt a lot.
Thanks!
Hi. I learned quite a bit from your video. I came acrossed it while looking for a how to seal a 4" sheet (aluminum?) metal pipe that is used to vent our indoor pool heater. Last February our CO2 detector went off and it was determined that the leak was coming from the vent pipe that runs along the ceiling in the basement. What do you recommend using to seal off a vent that gets to high temps?
Sounds like you are talking about a single wall pipe which is now against code. Need to replace all of it with a double wall or even a triple wall pipe for the high temps you are referring to.
Hey bro I have a question ? When putting on the foil tape does the AC have to be on........
Best to turn it off!
Help! we get tons of dust in our house. what do you suggest?
Same here. I went upto the attic and found that our return was sucking dust from the surrounding air in the attic. The person who installed our unit didn't do a vacuum test so that's my next step. I plan on hiring someone to come out to do an efficiency test and patch any leaks.
Can I use gorilla tape instead of the demastic”or foil tape?
You can but it is always best to stick with Manufacturer recommendations
Is sealing air ducts important in an attic that has been conditioned by use of spray foam insulation?
Yes, check out Matt Risinger channel he goes over this
Yes. Air still escapes ducts into huge area of attic. Attic will be cooler but the pressure is reduced in the output. So, less cooling in home.
is it me or does it sound like you guys have a shop vac attached and are cleaning duct?
which brings me to my next question how do you clean the intake ducts that are using the wall cavities as a return or cold air??? been taping the hell outta sheet metal used to seal cavities from a basement unit in a split level home built in the 50s.
Do you ever do paid “FaceTime” consultations? We are struggling to find a crawlspace company because the good companies consider our job to be too small and the other companies that developed after Hurricane Sandy are not very good. My husband is handy, but we need to get an assessment of what to do.
We are so thankful that you think favorably of us. We do not do facetime, but we are more than happy to consult you over the phone of what needs to be done, in what order, and what products are needed for FREE. 865-659-0390.
Crawl Space Ninja thanks! We will be in touch after we close on the house!
@@CrawlSpaceNinja Wow, thank the universe for people like you, especially in times like these. Thank you. if there is prominent weird gray/yellow/pink fibers all over every item in the house, and I feel itchy, and there are new leaks (can see brown spots forming on ceiling), do you think it is possible that the ducts have holes in them? Thanks.
@@CONANCHICK sounds like your a/c system also doubles as a fiberglass &mold sprinkler system.👍 Good thing we're all wearing masks these days😅
@@CONANCHICK It is possible. I would contact your local HVAC to have an assessment and consider looking into air duct sealing.
I have a rectangle tube trunk line with 4 inch round tube runs off of it. The insulation is completely compromised and I have no clue what I’m doing. Wish me luck lol
You got this! Feel free to reach us at our forms - crawlspaceninja.com/crawl-space-help-faq/
What r-value insulation should be used on ducts in crawlspace? The insulation on my ducts have black spots and starting to sag and need to replace and address the humidity issue. Thank you in advance.
Depends on your area but most are using R-8 on ducts.
Can you use this tape on top of existing mastic globbed on around a collar. We have tons of collars on duct board and they leak like crazy
If its an uneven area, have you tried spraying with spray foam? If not, do some research on it sealing ductwork. That stuff seals great too. Hope that helps.
What is the difference between 1403-181BFX and 1404-181BFX? I see your store carries 1404-181BFX, and it does not seem to be rated for 40 years life cycle as the 1403 one.
Why not use the mastic paste
You can, I just chose tape for this example. Both work well and mastic may be quicker to install.
How safe are the vapors from the sealant later on when they use the heater?
Carlo - This product, when used under reasonable conditions and in accordance with the directions for use, should not present a health hazard. However, use or processing of the product in a manner not in accordance with the product's directions for use may affect the performance of the product and may present potential health and safety hazards.
We used the metal tape only a couple of years ago. It doesn't hold for long. Why? It was a quality tape.
Over time, especially if exposed to heat like in an attic, tape adhesives can dry out and lose their flexibility and effectiveness. How long the tape lasts will also depend on if the ducts were cleaned properly before application.
Bee Bob Try using mastic “butter” over tape. You should get better longevity with this method than use tape alone.
What kind of tape do you use on insulation? I need to fix some tear on my air duct insulation (Cal-Flex type) gray wrap in my in attic.
Nashua 557 duct tape and cover it with CADS Duct Sealant (very very messy, caution) commonly referred to as ‘mastic’. It prevents tape from coming off.
What type of tape did your place on the insulation that you cut into? Did you say 2 piece foil tape?
Yes, I used a 2 part foil tape but since then have been using this one. Easy to work with and very strong. Thanks for the question.
crawlspaceninja.com/product/venture-1525-duct-tape/😀
@@CrawlSpaceNinja the link doesn't work for me
@@pearlperlitavenegas2023 Here is an updated link! diy.crawlspaceninja.com/venture-1525-duct-tape/
can i air seal with foam over the insulation that wraps the ducts (ducts are in the attic)?
It is better to air seal the actual ducts and then insulate.
Those leaking section can cause condensation and make water ?
Alfonso Munoz Thank you so much for your comment.
I'm having an issue with condensation also. I tried caulking on the radius of the duct from inside. Still leaking. I'm thinking now gotta go from the top of the box going inside the ceiling.
So if ductwork is in a crawl space should it be insulated or left alone to warm the crawl and water pipes?
Ideally it should be insulated so that energy is not wasted as the air travels through the duct work. Insulation will also make the ducts less likely to condensate. We recommend closed crawl spaces with proper humidity control and foam board insulation on the foundation walls to keep the crawl space from taking on cold outside air.
On one of my rooms it’s very cold in the winter and very hot in the summer I have to leave the door open, do you think the duck it’s clogged?
Without an inspection it would be hard to say what it is, We have also found that the situation you describe could be to duct leakage. If you are in the Knoxville area we can set up an appointment if you would like.
How do you get rid of mold in the ducts?
You will need to clean then disinfect with a fogger.
1- clean the duct work before taping with foil tape (not mastic tape) to remove dust, 2- never use hands to smooth out foil tape- use a squeegee 3- use MASTIC---(its not mastic tape)- mastic is liquid acrylic caulk- you paint it on. You cover the tape.
Sorry to be critical about your video- but taping is only a small part of the job- it has to be sealed with mastic. that is how you properly seal your duct work---refer to the ACCA manuals.
Thanks for the tip!
I've used foil mastic tape before and it provides a secure airtight seal as good as duct butter. When you're doing upgrades of poor installs under less than ideal conditions, you can't always follow the "book".
Will Mold grow in the ducts or HVAC system?
Yes it can
My attic duck insulation leaking water in the attic and as well as inside home ,so plz guide me that i need to seal the duck ? And if yes do i have to change the wet insulation too? which is surrounded the duck
I really appreciate your detail reply about my issue.Thanx again
Can you use a closed cell foam spray such as "froth pak" instead?
You should be able too.
Collar is supposed to go Into a junction duct box. IMO
If ducts are sweating should you replace?
Do ducts need replacing after many years-40 yrs.?
I would consult an HVAC contractor on whether or not they need to be replaced. But they are likely sweating because of high humidity and a dehumidifier would be a good way to help resolve that issue. Air sealing leaky ductwork is a good thing to do as well.
Why not just use mastic and brush it over holes..
Don't you have a Y-piece for that particular duct? Coz its look awkward regards of airflow
CrawlSpaceNinja.com Channel 20+ years wow! I like the name of the channel cool!
You know, I used to think the guy with the beard was different than the guy without the beard!
Hello: how do you seal ductwork if I have drywall installed already over the runs?
Anne Johnson . watched a video on here about a home inspection guy that used a thermal imaging camera to look for hvac leakage
Watched a video where the technician air blew a rubber compound into the system. The rubber would plug all the leaks.
@@SanchoSanto That was on an episode of TOH [This Old House].
The product is called Aeroseal and you need an Aeroseal contractor to install it.
Instead of mastic, if you have some old house paint, USE IT. It's a rubberized latex coating that works outside in the sun (outdoor paint). Clean/prep the surface and glob away. Leave the lid off till the paint thickens a touch. Easy way to recycle that old paint.
ha Daniel Bryan . yes yes yes
Would you travel and seal a very large home in Chicago?
Anne Johnson I would suggest doing a Google search for a home energy auditor. Try to find one with BPI (building performance institute) or RESNET certifications. They will perform an energy audit on your home by depressurizing it with a blower door and then testing your home for leaks. It costs a couple hundred dollars but it tells you EXACTLY where to apply money/time/effort for the greatest return on investment. They should also be, or know of, a great air sealing/insulation contractor and be as helpful as Mr. Crawlspaceninja here!
Can't you just spray foam it?
Y fittings better
If your re-taping ever 5' of duct connect, your acerbating the air leakage problem which already is inherent in old nasty filthy duct insulation wrap. Its nearly impossible to effectively seal that many linear cuts in old dirty wrap. Two things I see need pointed out. Resealing any existing duct work is very difficult to do correctly. Often the physical duct structure can not be moved enough to apply tape correctly. Nor can the correct hand tool called a squeegee be used. But the second problem, is attempting to duct tape old dirty dust covered insulation foil and still maintain the vapor barrier after sealing air leaks. Its a conundrum! I see this is a dated video and assume your company have made improvements in this area of your craft. We do not use mastic the duct tape but in limited areas. Its does not hold long term to Our Standards and now use 181 duct tape and applied duct butter on everything. I do not have an answer for filthy old insulation except remove to a place that can be at cleaned. We found bubble wrap to be helpful in these places. We as a company stop use fiberglass insulation about 7 years ago and stop using it internally in 1992.
We assist our builders with their crawlspace designs using the semi air condition IRC building code application. The dehumidifier is only applied in extreme cases.
you seem to know ur hvac stuff, so may I ask would you use the mastic tape and then the duct putty or vice versa? thank u 😊
Your answer to seal duct work then is tape it. 🤭