The #1 Problem in Home Performance- Air Leakage: Ep 302 of HOME DIAGNOSIS TV Series
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- Опубликовано: 16 сен 2024
- Grace and Corbett Lunsford take you across North America investigating the story of air leakage with visualizations and demonstrations testing this ultimate invisible dynamic, AND the disasters it can lead to in worst cases, including one of the worst mold infestations we've ever seen.
Join our team and keep this show independent: / homediagnosistv
Featured researchers and experts:
Anil and Nilima Mittal- Moldy Home Survivors
Jason Earle- Mold Inspector at www.gotmold.co...
Marianne Touchie- Building Scientist at University of Toronto
Delphine Farmer- Atmospheric Chemist at Colorado State University
Elliott Gall- Air Quality Researcher at Portland State University
Jake Nuckolls- Building Performance Trainer at buildingperfor...
Also featuring NIST net-zero research center (www.nist.gov/e..., the House of Pressure, and lots of footage courtesy of Creative Commons and the US DOD. The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement.
Dive deeper at: HomeDiagnosis....
Good timing. I've been encouraging the management of our 6-story, 22 year old condo building to test air pressure/transfer due to what I believe is negative pressurization in our units. I'll be sharing this episode with them. Thank you.
Wonderful, Bill!
Thank you! I have been a devoted fan of your work for years now. I am building my own home slowly by myself. Your work has proven vital to everything I have done.
That is so great to hear, Tom! Thanks so much for saying so!
Not only should he win his lawsuit but the state of Texas should go after that builder for neglect and putting people in danger.
I absolutely love what you guys do!
Keep it coming
Happy new year!🎉
Thank you Jon! Back atcha.
I’m so jealous of how passionate you and your wife are about home performance. I need to find myself somebody who is as interested in HVAC as y’all are.
Aw thanks Kris! We’re grateful to still be getting more and more interested too, after 15 years. Always new things.
Great episode! I had seen a lot of the footage previously, but the way it's put together to tell a story is stellar! Keep up the great work!
Hey thanks man!
pretty slick outfit you all are setting up. Your work and content on indoor air has helped informed my homeowning decisions and knowledge journey since it started with covid. My and my family's health thanks you.
Thanks Anthony, so glad to hear we’ve helped your family!
Awesome video! That house building model is a great learning tool. I work with assessing and mitigating soil vapor movement into buildings in an extremely cold climate (interior of Alaska). It can be difficult to teach others about the mostly invisible dynamics of air movement. I will be recommending this to others and doing a dive into your other videos. Thanks so much for recognizing the importance of this topic and presenting it in a clear and well researched format.
Hey thanks Shawn! Stay warm and keep up the good work.
I really enjoyed this, but felt there was a huge gap in the story--with the initial house, what exactly was the cause? Millions of homes have their HVAC in unconditioned space and don't suffer tremendous black mold. What were the factors *in that house* that caused an event as serious as that? That would really help apply a lot of the valuable academic lessons being taught in the episode.
Stay tuned, it comes back. Also, the longer vid is linked.
Mold House Tour and Scientific Causes: Disaster Production Home Build in Houston Texas
ruclips.net/video/x_jAxHZ-zLE/видео.html
What if they ran 4” insulation board between the trusses along the roof line. I wonder if that would have stopped the mold?
Considering the size of their investment, why didn't they hire a professional building inspection service at a couple of key points: footings, before close-in (framing, plumbing, electrical, and HVAC), and finish? Yes, it is an additional expense but they live in an area where the county isn't providing the service.
They did, that’s the sad part. Production just moves too fast to correct things correctly.
@@HomePerformance Next week, the foundation company will start work on my project. I am at the other extreme, where the county wants to micromanage everything. Thanks for sharing your reflections on the prior house because I am borrowing ideas from your prior videos. The discussions on filtration, ventilation, ERV, dehumidification, and kitchen fresh air makeup are being considered for our all-electric home with zero fireplaces.
@josephmerritt1411 rock on Joseph! Go get it.
Great video wish more people would take air quality seriously
Wow that was awful! I was worried about adding air conditioning to my attic furnace now that summer temperatures are unbearable. I’m now looking at several mini splits to handle the job.
Agree on open fireplace should be illegal but the cast iron fire stoves should be in every home as an backup heat source (at least cold climate) and it should be air tight when closed.
But the homeowner need to know that if the kitchen stove ventilation is on and you try to light a fire with a cold chimney it will suck smoke in, and you need to open a window/turn off the fan or have a makeup air fan to prevent negative pressure while lighting the fire.
In my home i have taped the wire tube joints (don't remember it in English but we have all electrical wires in walls innside plastic corrugated tubes) and some that go outside for like my door bell i put 2 foam ear plugs where the wires go out to completely seal it and keeping it easy maintenance for later.
Also have a infiray thermal camera that is supreme to find air leakage and thermal bridges and done many air sealings around.
And i also have many air quality sensors around, in the kitchen, living room and bedroom and it is controlling the HRV in my house so it is only on demand, my unit is oversized so it is less than half the time on and Co2 is always below 700ppm and average over a year between 550 and 600ppm, tvoc is always below 0.03mg/m3 but mostly under 0.02mg/m3.
My house is from 1960 and have air sealed pretty well and is half way through a full insulation and renovation, it is much better air quality than my friends houses that is built after 2010, not as well insulated but better for living, and i use less energy than them also since all my heating is heat pump, and only one 200watt electric space heater for the toilet. And an 300watt air dehumidifier running 24/7 in the basement
so true with fireplaces. still a common heat source where i am. but even in older homes, big fans are being installed and depressurizing the room (or house) causing back a back draft.
what annoys me is professionals, like fire service, ignore it or incorrectly assume the fan is for something else therefore its not the cause.
You guys are amazing, seriously. ❤
Love the demo house! Backdraft is obviously an issue, but in my ignorance I ask - what effect does the upward force of hot air have on counteracting backdraft, if at all?
On a 20 deg F day, you get about 4 Pascals per floor. On a 90 deg F day, you get about 1.5 Pa per floor.
and when a fire is going?@@HomePerformance
I have a fireplace with sealed glass doors. Do you worry about air infiltration with those as well?
GREAT INFORMATION!!
I saw the new video pop up just after boarding a plane, and happy I got it downloaded before they made us turn on airplane mode. Knowing someone in the middle of building a new house where the builder is a regional volume builder, is there anything that can be done to prevent this during the pre-insulation inspection? Or any recommendations on how to find an inspector who will identify the issues leading to problems described in the video? The builder generally hits under 3 ACH50, but not by much.
Great video, i shared it with the person building a house.
Great to hear John, glad it hit the spot! Yes, inspect and test with a third party- BUT that might not be amenable to the contract he already signed.
Great video! Too bad I missed you when you visited NIST
Thanks Mauro! Next time.
What happened with the lawsuit? I remember this couple, but I never heard the outcome.
Thank you
Still unresolved. They were given a court date of this October.
If you use radial/centrifugal fans in the demo-model 13:48 (instead of axial fans), you can hit higher dP values. (If that is something you might be interested in).
Radial fans are slightly more expensive than axial fans, and have lower volumetric flow-rate (no such thing as a free lunch) but might be able to demo some effects better.
Wow this was amazing. My guess is that 98% of builders and HVAC companies don’t know ANYTHING about anything that was discussed in this video.
Agreed that most new construction is trash.
Thank you- feel free to share!
Very true, especially with new construction. Builders always choose the cheapest HVAC contractors that cut corners. I only work with a few custom home builders and we fix a lot of terrible work in existing homes.
Pretty sure at 7:17 that wood I beam is not supposed to have that size hole in it either for structural integrity “the ducting”
+1 houses are often designed with no thought into the services and products that will be fitted. so trades just make it fit.
What handheld smoke/fog unit is being used during the main "House of Pressure" segment?
Called a Cirrus Wind Indicator
Do yall do this as a podcast version too?
Maybe in the future specific to this show, but... in the meantime: buildingperformanceworkshop.com/blog
buildingperformancepodcast.com
for lots of "listen and learn".
If only there were building materials that weren't so moisture sensitive that they turned into mold food the second they saw a drop of water...
Also, never trust a GC or subcontractor; always double and triple check their work. And write it in your contract that they don't get a single penny if the work isn't completed as designed, and inspected by a third party.
Let me guess, Horton house?