Dr. Joe on The 2nd Law, WUFI Analysis and Vapor Pressure

Dr. Joe Lstiburek on The 2nd Law of Thermodynamics, WUFI Analysis and Vapor Pressure
Excerpt from Day 1 of Building Science Fundamentals | May 15, 2019 | Westford, MA 01886
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[@hosoiarchives4858]

. 1:59 thermodynamics 3:47 moisture 5:30 groundwater 7:07 9:52 air flow 10:31 temperature and moisture

[@hosoiarchives4858]

I love this guy

[@frankgall6]

I love joe

[@danelynch4002]

I want to thank you for your suffering with the social media . Thank you You have provided me with a wealth of information that is almost impossible to find . I believe that this is the type of stuff that should be taught in all level building trades . Wether it is trade schools , collages or even job site training . It is fine for academia to sit in some office and argue about the semantics . But this information needs to be put in the hands of people that can put this , (your) knowledge into real world practice . I called several collages and junior collages before finding your lectures on youtube . Needless they had no idea what i was talking about . Some even went as for as saying that it wasn't important in our area . Needless to say i was shocked . Again thank you for sharing your wealth of knowledge .

[@markodeen4105]

Joe, your humor levels are always at or often below the necessary levels! I'm glad you caved and started a channel it will save me from surfing around the internet to find you dispensing the sage knowledge you are passing on from the Old Guys who preceded you.

[@frankgall6]

I can listen to dr joe all day, literally

[@dustindth1]

I enjoy your humor and simple way of explaining building concepts. I'm a big fan of your videos!

[@kaibuilt5374]

Thx you Dr. Joe for you humor and making it a joy to listening to your lectures. You have changed the way we build and to ask questions. It should be mandatory too take your listen to your lectures

[@pjackson8322]

Dr. Joe, thank you so much for your life's work in this field. I've been in the HVAC industry only for about 3 years and I see a large amount of underutilization as well as potential for innovation in both building science and HVAC industries. Please keep sharing your knowledge. I am learning as much as I can from you and your work in hopes to provide the next jump in innovation. Thank you.

[@theverdictisstillout]

I've seen many of your videos. Love you man. Thanks for posting and enlightening us all.

[@tomskatteboe8527]

Well i have brother that analyzes everything this is refreshing to get good old common sense.

[@chuenyeelau]

Love your lecture! Thanks from Saskatoon

[@michelrea2403]

Great information. 👍 finally information that’s clear!

[@bobjarrard]

-- Thanks Doc - as a 50 year+ General Contractor I have long ago stopped reading the code or the calcs for answers, I just want a permit and be left alone. I buy insurance for my mistakes not reports. That being said, I still struggle with the concept of which single membrane to use at the tipping point of condensation. Should I put a bituminous adhered shingled continuous membrane over CDX ( or over that green stuff/OSB) and should I take some measure of caution and tape/caulk the CDX (and seal the nail/screw holes)? If I have some extra cash, should I use a liquid applied system on the sheathing and then use a membrane? If I blanket the outside with 6" of rock wool (1, 2 or 3 layers rotated at each layer or ? - (I watched your video of your neighbor's comment on your roof showing lines when you strait stacked your roof insulation), will the fasteners on the 3/4" standoff really self seal or does it matter (and should I use 3/4" ply or OSB or marine ply or pressure treat something or a HD plastic )? What is the perm rating of this assembly - is it more than the perm per inch of rockwool and does this matter? Is there really a two way membrane? Should I skip the inside insulation totally or does that foster convection currents and air washing and if that happens is good or bad? Is the best inside to outside ratio of insulation really 50+/50- or is it 66/33 or ???? Should one use an insurance water barrier at the back of the rain screen on top of the insulation but under the strapping (or over)? -- I do not expect nor think you should answer these questions more than you have already done in the past. I will eventually buy a library of your books, read to exhaustion, put thermal last and water first, make my first cut of design and then pay for critique from you or someone who thinks like you do. I like pretty also, so as always, money talks and XXXX-XXX walks. Years ago I realized that being a builder meant I should have gone to clown school first to learn how to juggle. -- I know you receive all the offers, but if you get to Clark County, Nevada (those of us who live in Boulder City do not say the words "Las Vegas" if can help it), please let me show you any courtesy possible (no free consultation over a burger - just a small payback) PS: I wear a few hats, one of which is as a pastor and I can tell you that not one of my credentialed friends including several with PHD's (or two) can grasp the fact that laws are what we cannot prove or disprove and to quote a digital friend "They just are!". On examination, this has proved to be also true in areas of doctrine which I view has a nice chapter called "physical laws". -- May we both continue to live and prosper (if that is our choice) in the areas of the world where the laws fit the 15/20 and then send our condolences to those who live in the 5/20 group. Bob Jarrard [e-mail]

[@microcolonel]

As a software developer, I understand this man's frustration with stupid questions.

[@johnstewartrichards5922]

In Indonesia they like chips with spices. Their chips are often hot, the local ketchup is hot. Sometimes in restaurants you will get fresh hot ground chilli spices ground into a paste. This is served to you on a rock. Why? Because Rock Don’t Burn* If you see this paste. Next immediate step is to order cold Bali Hai Beer! Why? Heat goes from warm to cold! Comprehension of which is important as cold beer will always cool down hot spices! Be aware as time passes you will have reached some level of thermal balance and may need to get ready to appreciate that “goes in hot, comes out hot.” Can become a handy guide for future consumption. *Rock don’t burn. This is correct when considering conventional house construction fire protection and fluffy or rigid rock wool insulation and an environment safe for humans. Typical rock used is Igneous. Made by volcanic fire. Very high temp required to burn rock based insulation. If it gets hot enough to burn, you most likely will have become less than carbonized toast. Sedimentary rock like Coal burns at a much lower temperature...

[@davidbruce5377]

I wished he had talked more about diffusion at the roof peak, on a conditioned attic. I think the move to tight insulated exteriors, is confusing designers - particularly, the latter. IMO.

[@pcatful]

kzbin.info/www/bejne/sJnOeJahobx1lbM

[@Krunch2020]

The Second Law according to Dr. Joe: “Shut up and don’t do stupid stuff.”

[@bobmorrissey5885]

I have a house built in 1910, 2-story, with a crawl-space and a steep roof over the attic, 2,100 sqft. Craftsman with shiplap construction (2x4s). The first floor has wainscoting up to 5’, lath and plaster for the upper 4’ for a 9’ ceiling. The second floor is 8’ of lath and plaster. I would like to insulate the house with closed cell spray foam insulation but because there is no vapor barrier I’m concerned about wood rot from water due to lack of air flow. I have opened up some walls and can see from staining that the house leaks water every once in a while, but doesn’t cause rot due to airflow. I want to improve the house but I don’t want to ruin it. Please help. Thanks for your time and consideration. -Bob, from San Pedro, CA

[@CMCraftsman]

I have the answer you don’t want to hear. It’s that if you want an improved version of that home you would need to have a replica designed with new construction materials. If you love that house, leave it alone and understand that there is a cost associated with anything like that. Log cabins, old farmhouses, etc… I’ve seen so many beautiful old homes stripped of their beauty living in New England, gingerbread trim removed that was too expensive to replace, vinyl siding slapped over clapboard siding they didn’t want to paint…

[@jkickass]

we don't have gray hair at my office so we just do wufi analysis