I'm a former CPA, now an insurance agent, yet of the hundreds and hundreds of conferences / lectures I've watched, Mr Lstiburek articulates his material extremely well and I enjoy learning from him. Thank you.
Formerly employed at a rink in St.Paul area. Dale Hanson from R&R Specialties would occasionally bring in his buddies, Dave from Jet Ice, and Danny from the Black Hawks (assumed to show how not to solve problems around the ice surface). One time another person was present, who appeared to be friends with Dave, and looked alot like Joe. When jokes go flat, remember there may be some old coot out there spending pension funds trying to learn how to build the perfect wall Great advice and concepts presented.
agree audience bunch of duds, hes informative and funny, knows his shit. I compare what hes teaching which has changed a pit since i saw his vent or not to vent with the youtube builders. Im glad a lot of builders are steering this way he tells us why we do what we do. the why is always the most important
From shoot installers THANK YOU. I always claimed that in ny we should avoid any vapor barriers thus we have 4 seasons. No engineer till now even had a clew of vapor control. I hope one day to have the privilege of discussing my tactics with you face to face and get your input on products I designed for my installation. I couldn't find a single manufacturer that was a service
watch more southern builder they get into the vapor control and why more then northern builders, just reverse it up here. but I agree his perfect way with rainscreen is awesome. I do 2x8 when i can 2" of closed cell themn my utilities and finish with rockwool ... I would love to try airobarrier but no client is willing to pay
What you guys are not understanding is that most leaks in a most leaks in a super tight house built after say 2000 is caused by negative pressure pressure warm to cold contents condensation not water
Every home owner should understand the "perfect 500 year wall" and its wood frame sub-type. Know that you can't use vinyl wallpaper, on the interior side of an exterior wall, in an air-conditioned house in Memphis TN. (Why not? if the exterior water barrier were perfect, this would be OK. But no water barrier is perfect, and it's water vapor's job to leak through any and every such imperfection... only to condense on the gypsum-board side of the vinyl wallpaper.) Now I have one question for Dr. Lstiburek: Could I use that vinyl wallpaper, on that same interior side of that same exterior wall, in an air-conditioned house in Memphis EGYPT? (Assume the house is wood frame stucco, with a good water barrier on the exterior wall beneath that stucco; the wooden stud bays are filled with fluffy cellulose that's treated with borate to deter termites.)
I'm no Dr Joe, but so long as there isn't a humidity issue (Memphis Egypt is in a desert, like Las Vegas), then yes, you could use vinyl wallpaper (like the do in Vegas). Actually, in other talks Joe makes the comparison with Vegas (hot/dry) and Memphis (hot/humid) and he asks 'what's the same about the two?' - answer is 'both have casinos' - but crazily the casino companies built them the same in Memphis as they did in Vegas - Vegas hotels have no issues with mold, while he says Memphis architects, consultants and builder pray for hurricanes to knock down the casinos so they can avoid expensive lawsuits/repairs for all the mold/rot behind the acres of vinyl wallpaper...
I'm just a house owner and this is video is amazing. Question: there is no problem if condensation is forming om the outside but between insulation and membrane?
If moisture forms on the outside of membrane it needs less than 1/32 inch gap to dry. This can be done by putting small bumps on the membrane. Some builders use silicon caulk to make spacer dots/bumps. Another way is to put grooves in the insulation like as done by inso fast. Vapor can then find a way out to dry. Joe didn't emphasize the need for this tiny gap if using closed cell polystyrene outsulation.
How does the "perfect exterior wall" dry out, if the building is in a severe heating climate like Churchill, Manitoba? The air gap (drying gap) is exterior to the water barrier, but the moisture that condenses on that cold surface condenses on its INTERIOR because the moisture-laden air comes from WITHIN the living quarters, and penetrates the structure. Does the "perfect wall" theory hold that, by virtue of R1000 insulation outside the water barrier, the water barrier never gets cold enough to get wet from the inside? (Then why have it? Ah, as a VAPOR barrier so the insulation doesn't turn into a condensing morass.) Does all that interior moisture reach equilibrium, and bounce off the interior surface of the water barrier... without damaging the wooden studs and other organic materials/oxidizable metal?
So just to sum it up, the idea is that the control layer on the outside is kept at the same temperature as the conditioned space. Condensation will not happen on the inside because at that temperature it's like 40-50% relative humidity and the rest of your house would have to have condensation all over the place to be an issue. Condensation can happen on the outside, but that's just brick, XPS, vinyl, etc so the water on the outside is harmless.
it doesnt the exterior insulation creates a thermal break between the warm and cold so no condensation, interior moister needs to be controlled with HVAC
@@rooflogiclimited1579 Shame on you censoring a living legend. Put up the full video! I have seen all his talks, there's nothing that requires censorship... but it's clear from your reply and the video audience that people in NZ have NO sense of humor whatsoever.
Joe is an acquired taste. People don't know what to make of him at first (I didn't atleast). He mixes serious info with over-the-top theatrics, which may seem like it is a good idea to keep the audience's attention, but it actually distracts from his info.
So I’m guessing you host a lot of parties with the roof leak theme? Lstiburek is not as funny as he thinks he is. His nerd jokes only detract from an otherwise serious, and interesting, subject.
Sometimes, repetition is key to understanding. He's got to reach a lot of people with the same message. Better to remain consistent, joke style and all. That's how you remember the material (pun intended).
@@ArthurDentZaphodBeeb Maybe when people finally start following his basic instructions, he can talk about something else...?? It's not his fault that there's plenty of idiots out there who HAVENT understood where to put the vapor barrier or how a wall works.
I'm a former CPA, now an insurance agent, yet of the hundreds and hundreds of conferences / lectures I've watched, Mr Lstiburek articulates his material extremely well and I enjoy learning from him.
Thank you.
Excellent discussion and thank you for bringing it down to earth. Thank you!
Joe Lstiburek is the best ...
Joe is a funny guy. His presentation for owens corning "to vent or not to vent" I think its called, he was just as funny
Thanks for posting!
The guy gulping beer at 14:36 lol priceless
Problem with building science engineers is that Joe is the only one who found his sense of humor, the rest are Germans.
Formerly employed at a rink in St.Paul area. Dale Hanson from R&R Specialties would occasionally bring in his buddies, Dave from Jet Ice, and Danny from the Black Hawks (assumed to show how not to solve problems around the ice surface). One time another person was present, who appeared to be friends with Dave, and looked alot like Joe.
When jokes go flat, remember there may be some old coot out there spending pension funds trying to learn how to build the perfect wall
Great advice and concepts presented.
God, his audience is dead! What a waste - this guy is smart and funny.
This is a great talk to induce sleep expect where he yells.
agree audience bunch of duds, hes informative and funny, knows his shit. I compare what hes teaching which has changed a pit since i saw his vent or not to vent with the youtube builders. Im glad a lot of builders are steering this way he tells us why we do what we do. the why is always the most important
From shoot installers THANK YOU.
I always claimed that in ny we should avoid any vapor barriers thus we have 4 seasons.
No engineer till now even had a clew of vapor control.
I hope one day to have the privilege of discussing my tactics with you face to face and get your input on products I designed for my installation. I couldn't find a single manufacturer that was a service
My company website is shootinstallers.com
Shoot installers inc
watch more southern builder they get into the vapor control and why more then northern builders, just reverse it up here. but I agree his perfect way with rainscreen is awesome. I do 2x8 when i can 2" of closed cell themn my utilities and finish with rockwool ... I would love to try airobarrier but no client is willing to pay
Well at least he's entertaining himself.
What you guys are not understanding is that most leaks in a most leaks in a super tight house built after say 2000 is caused by negative pressure pressure warm to cold contents condensation not water
Every home owner should understand the "perfect 500 year wall" and its wood frame sub-type. Know that you can't use vinyl wallpaper, on the interior side of an exterior wall, in an air-conditioned house in Memphis TN. (Why not? if the exterior water barrier were perfect, this would be OK. But no water barrier is perfect, and it's water vapor's job to leak through any and every such imperfection... only to condense on the gypsum-board side of the vinyl wallpaper.) Now I have one question for Dr. Lstiburek: Could I use that vinyl wallpaper, on that same interior side of that same exterior wall, in an air-conditioned house in Memphis EGYPT? (Assume the house is wood frame stucco, with a good water barrier on the exterior wall beneath that stucco; the wooden stud bays are filled with fluffy cellulose that's treated with borate to deter termites.)
I'm no Dr Joe, but so long as there isn't a humidity issue (Memphis Egypt is in a desert, like Las Vegas), then yes, you could use vinyl wallpaper (like the do in Vegas). Actually, in other talks Joe makes the comparison with Vegas (hot/dry) and Memphis (hot/humid) and he asks 'what's the same about the two?' - answer is 'both have casinos' - but crazily the casino companies built them the same in Memphis as they did in Vegas - Vegas hotels have no issues with mold, while he says Memphis architects, consultants and builder pray for hurricanes to knock down the casinos so they can avoid expensive lawsuits/repairs for all the mold/rot behind the acres of vinyl wallpaper...
I'm just a house owner and this is video is amazing.
Question:
there is no problem if condensation is forming om the outside but between insulation and membrane?
If moisture forms on the outside of membrane it needs less than 1/32 inch gap to dry. This can be done by putting small bumps on the membrane. Some builders use silicon caulk to make spacer dots/bumps. Another way is to put grooves in the insulation like as done by inso fast. Vapor can then find a way out to dry. Joe didn't emphasize the need for this tiny gap if using closed cell polystyrene outsulation.
What would you consider perfect like 0 leaks imagine how dangerous that house would be
How does the "perfect exterior wall" dry out, if the building is in a severe heating climate like Churchill, Manitoba? The air gap (drying gap) is exterior to the water barrier, but the moisture that condenses on that cold surface condenses on its INTERIOR because the moisture-laden air comes from WITHIN the living quarters, and penetrates the structure. Does the "perfect wall" theory hold that, by virtue of R1000 insulation outside the water barrier, the water barrier never gets cold enough to get wet from the inside? (Then why have it? Ah, as a VAPOR barrier so the insulation doesn't turn into a condensing morass.) Does all that interior moisture reach equilibrium, and bounce off the interior surface of the water barrier... without damaging the wooden studs and other organic materials/oxidizable metal?
OK, Dr. Joe wrote "Understanding Vapor Barriers" (BSD-106) and I'm going to read that. Thank you, Dr. Joe.
So just to sum it up, the idea is that the control layer on the outside is kept at the same temperature as the conditioned space. Condensation will not happen on the inside because at that temperature it's like 40-50% relative humidity and the rest of your house would have to have condensation all over the place to be an issue. Condensation can happen on the outside, but that's just brick, XPS, vinyl, etc so the water on the outside is harmless.
it doesnt the exterior insulation creates a thermal break between the warm and cold so no condensation, interior moister needs to be controlled with HVAC
What’s with the cuts? For time’s sake, or censoring?
Hi Nicholas, yes for both.
Can watch full-length videos of Joe's talk if you search YT - don't know why they censored anything...who cares about time when you can fast-forward?
@@rooflogiclimited1579 Shame on you censoring a living legend. Put up the full video! I have seen all his talks, there's nothing that requires censorship... but it's clear from your reply and the video audience that people in NZ have NO sense of humor whatsoever.
Is anyone in the audience alive?
What a dry audience!!! They are so stiff and don't seem to get his sense of humor. Feel so bad for him!
He hardly got any laughs... Must be alot of serious people in New Zealand.
Joe is an acquired taste. People don't know what to make of him at first (I didn't atleast). He mixes serious info with over-the-top theatrics, which may seem like it is a good idea to keep the audience's attention, but it actually distracts from his info.
"Over the top"? Man, you must be fun at parties....
So I’m guessing you host a lot of parties with the roof leak theme? Lstiburek is not as funny as he thinks he is. His nerd jokes only detract from an otherwise serious, and interesting, subject.
CENSORSHIP IS STUPID
All his talks are the same. Same material. Same attempt to be witty and humorous when he is not.
Yeah, he's gotta come up with new material. Same talk, year after year. He's phoning it in.
Sometimes, repetition is key to understanding. He's got to reach a lot of people with the same message. Better to remain consistent, joke style and all. That's how you remember the material (pun intended).
@@ArthurDentZaphodBeeb Maybe when people finally start following his basic instructions, he can talk about something else...?? It's not his fault that there's plenty of idiots out there who HAVENT understood where to put the vapor barrier or how a wall works.