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Perfect wall is the wall where you can't make a mistake. Use i.e. foamed glass insulation under the ground and hempcrete above. In general, nature had enough time to learn how to deal with vapour, mimic it. And one more thing, best vapour control is ventilation. Thank you.

Thank you for sharing all this great data! Sure gave me a few more things to ponder, but I am also confident that I am on the right track.

Having followed Super Joe since the 1980’s these short clips are perfect for driving home an essential point. In snow country you need a cold roof to prevent ice dams.

The god father of Building Science. I appreciate this man and his body of work.

Thats it?

Love the comment about the Recycle Bins, you know us Canadians!

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Interesting information!

V2B, or Vehicle-to-Building is an interesting concept.

Interesting presentation!

Every aspect of life should be taken into account when planning a structure. Light, heat, fresh air, vermin, fire, mold, risk zones (earthquakes, tornadoes, hurricanes) accessibility, impact on neighbors, solar access, and cost amongst others.

I made the move from architecture to local government a few years ago and so many frustrating AHJ behaviors make more sense now. My biggest takeaway is that I often had months or years of time on a project by the time we submitted for permit but the city only gets it for a few weeks. Every request that seemed to come out of left field was actually people trying to accommodate me but it felt like obstruction at the time because I had so much more time to get comfortable with the project.

What this doesn't take into account, is that mortar is absorptive and the same idea of pressure will occur with water "pushing" into the mortar droppings due to hydrostatic pressure. So we typically don't have mortar droppings like that shown in the video, especially when trained craftworkers are used.

The U.S. Gov tested buildings to see what would hold up best for earthquakes and fires..Earthbag and strawbale homes rated the best.. why aren’t we finding more efficient ways of building to be more prepared for natural disasters? There is a hurricane, tornado, wild fire, earth quake, flood, ice storm, mud slide, snow storms, etc somewhere all year long anymore!! Be it Natural disasters or mad made Disasters.. it’s become a frequent problem in our country.. Isn’t it time to start building smart to better prepare for whatever the future throws at us?

Excellent presentation!

Being calm and respectful has definitely helped me out in the past. I had a situation where we were trying to get a final on an addition to a structure. The field inspector that came out for the final was not the one we had been seeing for all the other stages. He threw a temper tantrum and red flagged everything saying the other inspector didn't know what he was doing. I asked politely if we could escalate the decision to the chief inspector. The guy decides to call in right then so the chief could give me the 'what for' in real time. I pleasantly got to sit there and listen to the chief set the field inspector straight in no uncertain terms. We got our green sticker and final/CO that day😂.

Comments are a little out of scope: I have drafted and submitted permits for specialized industrial equipment with high safety/fire risks and this is sound advice. Not everyone knows everything. On the flip side I have had fire chiefs just flat out say 'I will not allow any equipment that is not of this type in this application' which is super annoying and we walked away from small jobs sometimes. On the bigger jobs, we got local licensed engineers to provide more detail on the safety and applicability of the equipment and when the money is there it was worth it. We would typically look for a local engineer(or firm) on those projects as well. Because it helps if the entire plan/approval/end user team can see the site and talk through the entire project. They really are a team too, you're all on the same side. I've also seen some absolutely silly permit resubmitted requests over what I can only chalk to the outsourced approval team verifying their cost to the city.

Its called humility.

Absolutely!! As a former AHJ I totally agree with you on this. On the inverse, some code officials need to be humble about their position and be willing to listen. That’s why it’s very important to be respectful and build a good rapport and reputation with the jurisdiction.

Wow, so well explained for something I had never considered before. Thank you. May I ask that if I were to build my house using the same techniques and materials as a commercial warehouse that has used zero brick and mortar in its construction can I survive a hurricane

When I was at uni in the early 1990s. Most of the books on passive heating / thermal ma's were from the USA. I feel the good work got lost in the USA through politic noise and mass cheap housing. From the UK perspective MAS uSA housing appears cheap and not designed to last in a mild climate. Let alone the actual US climate of hurricanes, flooding, tornados. Which appears strange. I feel my profession of RICS building Surveying has lost it way. We are no longer paying attention to building science.

So do plans tell a story? Or do they convey a design pattern?

A gentleman would rescue a man trapped in a well, but he would not jump in himself. He is not perfect, but he is not stupid, either. - Confucius, Spring and Autumn Period Good advice from Dr. Joseph Lstiburek: The Harvard School of Public Health is recommending that we maintain interior relative humidity between 40 and 60 percent during the winter. I’m not arguing with the health science basis for this, just the building science basis for this: Relative humidities this high in houses are going to be a killer in cold places where we have winter. Yes, bad pun…

One of the best presentations I have ever seen at summercamp.

Capillary rise stops at about 33 ft (10 m), you need to check *Jurin's Law.* There is a force upwards due to the contact angle between water and the material (wood, brick, concrete, mortar,...) and there is a force downwards due to gravity acting on the water column which leeds to a higher water pressure at the fee water surface (your bucket). A higer water pressure at the free water surface level means a water pressure below 1 atm at the top of your capillary water column (equilibrium). And because you can not go below absolute vacuum, the height of your water column is limited to 33ft or 10m. _Trees can grow above 33 ft because of _*_internal_*_ evaporation (day) and condensation (night)._

The passive house community could have saved a lot of time had they appreciated the influence of thermal effusivity sooner. The thermal mass doesn't contribute to regulating comfort over diurnal scales if there's insufficient area or if it's not conductive enough. This becomes obvious with highly variable solar gain or occupancy rates. Passive thermal regulation of a higher density, more conductive, internal lining systems, on a lightweight, highly insulated, timber frame structure, would contribute more to comfort than having a less well insulated mass wall system with a typical paper faced gypsum. Beyond that, you need active systems. There are some fascinating properties of thermal storage that make it really compelling for larger deployments: - The surface to volume ratio improves with scale, which translates to better cost per unit storage. - Heat loss is proportional to surface area, so it becomes more efficient at storing heat over long durations at scale. - When the full capacity of the storage system is not required, heat can be stored at lower temperatures using the full volume of the storage system, so the heat pump is more efficient and higher power output - meaning the cost of the stored energy is lower (unlike batteries where the charge state doesn't influence the cost of the energy.) - Water can be used as a storage medium and a working fluid, allowing direct mass transfer for efficient, high power, heat exchange. The problem is that the heat pump requires higher power output to exploit super off-peak periods of electricity. We still design heat pumps to meet peak instantaneous loads, which will be much lower than the power outputs required to store heat in advance to utilized peak PV or super off-peak rates on a variable tariff. This makes air sources more difficult to justify. We'd need an environmental source of heat to have their own TES, with liquid to liquid heat pumps running off water sources, or geothermal, or some hybrid solar thermal assisted reservoirs. Then there's the temperature range you can satisfy with a single heat pump refrigeration cycle, CO2 systems have a naturally high range, but perhaps cascade heat pumps would be better. Then there's seasonal variability in heating and cooling, I haven't seen thermal stores that can switch from heating in one season, to mixed heating and cooling in the shoulder seasons, to cooling only in summer. If anyone finds are good system design, let me know. E.G. Many configurations. I like Harvest Thermal's approach with C02 heat pumps. But there's also interesting liquid to liquid systems out there too: hydrosolar.ca/collections/liquid-to-water-geothermal-heat-pump-1/products/liiquid-to-water-dc-inverter-heat-pump-geo040v1lm-40-mbh-131-f-hot-water Case study with air source, PVT and high temp solar thermal: hydrosolar.ca/blogs/case-analysis/living-off-the-grid-with-solar-and-air-to-water-heat-pump

42:45 did I hear a gunshot?

A building legend indeed. I sure wish he had been writing 20 years earlier than he did. It would have saved me from a lot of mistakes.

"I`m a legend". Indeed he is. I am so glad I got "Moisture Control For Residential Buildings". It is the first video, his knowledge is only passed by his writing humour. Even for a Montreal resident.

I can sit there and listen to this man talk all day. how is he so good at making supposedly boring subjects so interesting 😂

Thanks, Joe! Much better audio than previous endeavors. Always appreciate your Insight.

Well there you go!!! you've got to be anally retentive and insane to get it right. I just need to find an asshole of a partner and we can start a business and get rich whilst liberating Russia and the Islamic world!!

Okay, but isn't the insulation closed-cell foam and therefore waterproof? So maybe no vapor barrier is needed at all?

Fascinating and eye opening. Any real-life examples of this causing damage? Or are you only getting hockey pucks stuck behind brick in Canada?

Please tell me more about this advanced hockey puck math system :-p

You’re the man Joe. You’re doing the Lords work.

Alas...It will never compare to the Great Wall of China.

I guess a better question would be , "Joe, what is your preferred RH in residential applications and why?"

Rrminds me of a cooking story. You always cut the end of the hambone off before cooking it in the oven.... Grandma didn't have a pan long enough. Context matters

Joseph Lstiburek is without a doubt the most notable individual in regards to everything regarding Building Science. That being said it's the Smithsonian not Smithstonian.

I'm left with more questions than answers!

Goodness ... so much info for someone building a new home! Is passive building overly expensive? I'm building with Omni Block. I'd sure like support with the build to make it as passive as possible. 5k min for consulting is pretty steep.

Are there viable options for adding to an existing wall from the outside?

Cold roof decks, Europeans have been successful at venting the cold roof deck for a long time, How? Permiter edge vent, along with mushroom vents. They have studied it for years and the venting along with very good vapor retarders and installation, and paying close attention to sealing, these techniques stop the condensation, Venting is a must 2" minimum space. (yes cold climate, vented flat roofs, insulation from below or "cold roof") they got (or can get) it to work, why because many times they must use a cold roof technique since they retrofit buildings that are hundreds of years old. (they also screw up, but again it is about the sealing and craftsmanship) The big problem here is that the mechanical system must move down into its own interstitial space.

According to the Insulation Institute, R-13 insulation is the minimum value to stop condesation from forming on surfaces.

The average HVAC system with flex duct and duct board here in Austin, Texas, is about .75 E.S.P. This study proves, yet again, that if the flexible duct design and installation is completed with care, flex works. However, I do not advise the use of duct board or more than 25% flex.

My great grandfather built his house in the 1930s based on Sears-Roebuck plans, using lumber another house he disassembled. I grew up in that house and my parents still live there. I hope I can someday give it a deep energy retrofit like this one.

Truly a living legend

❤