Science of Air Sealing, Insulation, & Control Layers - Ep 206 of Home Diagnosis TV Series
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- Опубликовано: 11 сен 2024
- There’s a fear abundant in the general public that houses “need to breathe” and they shouldn’t be built too tight, but what does that mean? House wraps, all-in-one Weather Resistant Barrier (WRB) sheathing, tapes, foams all can help seal a house tight, but then it must be ventilated right. And insulation in the cavities of your walls is good, but how can you add a continuous jacket of exterior insulation to really up your family’s comfort and energy efficiency? Every home is a system, and the skin of a home is as critical as the skin of your body.
Featuring a consulting/testing visit to Anna’s new house, where she’s having some trouble with moisture condensation, high performance enclosure expert Johnny Rezvani of 475 Building Supply, Matt Risinger of the Build Show, and the cherry on top: a field test of wind driven rain, or ‘Hurricane Test’ by Landus Bennett, using a pressure washer and 5 blower door tests at the same time.
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I loved it! This may be one of my favorite videos to date. This one reveals so many things in such a short time. I am hopeful that others will travel down the rabbit hole and binge your channel to learn more. Thanks for everything you do Grace & Corbett!
The construction detail in your house is amazing.
Hey thanks Turbo
Good information.
Excellent episode
Mold poisoned survivor here.
Looking forward to watching this.
Sorry to hear- thanks for following
Nice show will watch it again!!! keep up the good work
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thats so cool you brought on matt risinger. ive been watching him for years.
👍🏽👍🏽
Amazing video, I did lots of home improvements by watching your videos, venting bathrooms outside instead of in the attic, range hood that vents outside, installed ERV, replaced ducts and furnace so it matches manual J and S, installed MERV16 filtration... now im working to seal garage and lundry... you guys are infecting us with knowledge which is a good thing! Thanks tons!
HELL YEAH SEPERTUDE! Thanks!
Production quality is off the charts! 😮
Aw thanks Jarrett
i just found your channel and i love it. Ive done research into home performance because im an hvac tech looking to become a contractor soon, ive learned a lot through AQMD and NCI but i like how you get into the nitty gritty for people who arent super technically involved.
Thanks- glad you found us too
Our icf house was finished a few months ago. The number one thing people notice when they first come in is actually how quiet it is. I mean it is dead silent. Then if people are over for more than an hour it is how clean and fresh the air is. There are no smells. And if they stay the night it is how the temperature doesnt fluctuate at all. I am glad we spent the extra 10% to build this way over conventional.
CONGRATULATIONS you made it!
Great episode. Having just built a house with a national builder I'm now really curious to learn more about how our home performs.
Knowledge is power, Dan.
EXACTLY.
Love this topic. That foam install is awful , when it looks like bubble gum, some component was off on the installation. Maybe the Temperature, Pressure, or the Mix of part A or B , or a combination.
Also missing is the Intumescent paint.
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12:15 Living space over garage. Such a common problem.
At 22:50 you state you are putting a second air barrier on the inside. I have read that you shouldn’t have a wall between two air barriers as it can trap condensation between the two barriers and there is no way to dry. I read that in the south typically the air barrier is outer layer allowing drying to the inside and in northern climates the air barrier is installed on the inside to all the wall systems to dry to the out side. A WRB is still installed on the outside but it is not the air barrier.
As long as you allow VAPOR to dry freely to the inside/outside, do all the air barriers you want, Kevin :)
Any idea why you wouldn't want to insulate the ceiling of an attic if the floor is already insulated? Our house gets pretty toasty in the summer. My HVAC ducts run through a sealed attic which has blow in insulation on the floor, but no insulation in the ceiling. It's a 1.5 home so this attic space is small, and shares what I think I've heard referred to as a "knee-wall" with a our 2nd floor rooms. There is currently no ventilation in this space (no soffit intake but there are a couple of passive box exhausts) If I added insulation to the ceiling in this small area, wouldn't I be protecting it from the heat of the scorching roof?
You want the ins and airsealing to be together, at either the roof OR the floor. Your attic is very confused right now- so yes, you should do something, but a zonal pressure test while blower door is running is the right way to decide what exactly to do.
More homes built like this means less reliance on foreign energy sources, especially from unfriendly countries.
Holy cow! As a certified spray foam inspector, that attic roof foam application is one of the worst I've seen. It is no where near meeting the most minimum manufacturers specifications. I can see why they're having so many issues with their home.
I’ve seen lots that are much worse, Steven- keep up the good work
Corbett, what was coming in under those double french doors and on the subfloor ?
Good eye- that was water that we knew would enter, but staging hadn’t allowed us to fix properly yet. Was fixed later, but we were looking for all the unexpected leakages during the test.
I love watching you as husband and wife team. Question on the eaves to be added. That structure would not work in the midwest because of snow load, correct?
Thanks! It can work, but you’d need a different detail for it.
At 8:40 in the attic "you don't want both and you don't want neither"
Why not both? I was considering a 3-4" closed cell spray foam to the underside of the roof and 13" of blown-in cellulose on top of the ceiling to meet/exceed code R-values for climate zone 7. would this cause something bad to happen? The thought was going for a tempered attic and fully conditioned living spaces below... Thoughts?
YES, something bad might happen: you cannot predict what temperature or humidity, and therefore what moisture condensation, will be going on in your mystery cavity that’s not outside and not inside.
@@HomePerformance is there any way then to get code required r-values and cathedralized insulation for the air sealing benefit without paying for 10in of solid closed-cell spray foam?
Just don’t use spray foam at all. Takes more time, but less money.
@@HomePerformance yes Corbin, but exactly how ? And good luck convincing builders to trade time for money…for them time is money, and it’s SOOO easy for them to just tell the unregulated untrained spray foam ‘artiste’ to spray everything. And pass that cost along to homeowner rather than convince their employees or framing crew to stay up,on room putting a ventilated roof on.
My roof has a double layer of airtightness, as shown, and zero foam. And I bet 30 years ago none of us could imagine how much more we’d be willing to pay for coffee ($6.50 last time I checked on the popular lattes at you-know-where) or groceries that are organic and fair trade and pasture raised. We spend money on what we like- all we have to do is teach people to like having a good home.
Corbin-what happens to your nailed on eves the first time someone goes up on the roof to clean the gutters? Also, in most jurisdictions I know you are required to have a certain number of ac receptacles per running foot. Of wall- inspector wouldn’t allow me to eliminate all receptacles on perimeter walls.
The receptacles are singles in the floor in that case. And I’ve walked on the eaves plenty, that’s why the structural engineering is so important.
-Corbett
Is your company potentially working on a network of trusted/ certified builders (like angies list)?
I would like to see something like this. So that when you hire that company they are held to a higher standard. Better than the local building " inspector".
Would if we could handle it. But we have zero employees and aim to keep it that way. Angies List doesn’t really work to control quality either, fwiw
@@HomePerformance
Angie's list and such do not. Its a flawed system based on customer satisfaction when compared to the standards you are pointing out.
Often customers don't know what a good job or an excellent job is. They only know when it fails visually. " look my roof leaked"; "contractor left trash"; job not complete. There is nothing to prevent good hacks from succeeding.
HVAC is a problem here.. Every other van you see is a HVAC company. But i guarantee that a very small percent are interested in education and doing the job to better scientific standards.
Maybe some day someone can partner with you and creat a better system.
So much so that inspectors and even code can lean on the service to k ow that things are done right.
I’m ready and willing! Our concept until then is to educate the customers to judge performance. We’ll do the same thing with HVAC- stay tuned!
@@HomePerformance builders only build what the customer wants. So we need to teach consumers what good is so they will ask for it.
@@tweake7175
Agreed...
Yet the problem is that the builder has taught the consumer that, "things are normal". Or the builder doesn't want to challenge the consumer and say hey.. We gotta do it xyz way or it will cause zyx problems.
To many contractors are comfortable with not showing knowledge and just looking for the easy quick dollar.
Hvac systems are fully rebuildable. But yet if the unit is nearing 10 years.. "The whole system needs changed". And in our area.. They 90% want to oversize the unit.
We are in a cheap world these days. Particle board furniture that lasts a couple years is preferred over a well built family heirloom.
My frustration is showing.. Sorry.
My comment about water damaged buildings causing brain damage was removed????
Not by me, might have been youtube’s bots. Try again, maybe avoid using too many punctuations or trigger words.
Hey there- I can see that YT removed it again, though I can’t read the comment so I can’t help you. Sorry!
This video has way to high of production value for what seems to be a normal youtube channel