I really enjoy this longer, more in depth conversation. Please make more.

This is why I like Kevin as host, does proper questioning to get proper answers and presents all with a style.

Glad to see a focus on air sealing. A air tight home is more comfortable and saves money on utilities.

Rockwool has been used in fire protection engineering for many decades. It's great stuff. Very happy to see residential applications for the product.

Wow one of the best TOH segments that Ive seen, rockwool rocks, learned alot thank you guys !

Kevin, asking the tough questions we've all been wondering.

I've watched TOH for as long as I can remember, seriously and this is one of the best episodes I've ever seen. Period. Very nice. Thx.

Fantastic show of a great product. I would also like to say the crew did a great job of not adding any fluff to the facts of the process. Finally, Kevin you are what I call a great facilitator of the show which so under valued and so essential to the transfer of information. All the best.

Love this video, packed with info and giving a clear idea about all the layers and why they're there. Definitely worth the full watch. Thanks!

It is awesome that you promote fall protection.

Kevin’s body can’t hide the fact that’s it’s dying in the cold. 😂

Excellent discussion and visuals

This would work well for a block or concrete wall as well. Good job and this video was very detailed and informative.

Love this old House show. You guys are awesome

Rockwool makes an excellent product! We used some of it to make a set of DIY soundproofing panels for our radio show’s studio! As always, great stuff ATOH! 🎥

I've seen a lot of houses framed today with studs 24" on center to allow for more insulation in the bays and reduce thermal bridging through the studs. Then it just comes down to superior sheathing products on the outside to get more rigidity out of your wall.

It's like Matt Risinger's The Build Show - I want more!

Very informative, and perfect questioning. Thanks

Love these long videos, could easily imagine glossing over a basic description of R value in five minutes, thanks for going for the long take instead.

Good to hear them not completely ripping tyvek down. It is an effective barrier, even if it's not the best choice, it's still not the worse.

Kevin really wanted to show off his knowledge of insulation and siding lmao.

Great video!

I did want to mention when I redid my bathroom in CT I put in the Rockwool and it make a big difference, as I used it on the exterior and interior walls. I use to say the family I will sleep in the bathroom as it was so warm and comfortable.. So it is a great product, I also when I did insulated the attic i put it in all the kick walls as well.

Cool material 👍

Wrapping a home in foam board insulation or this Rockwool product before putting on vinyl siding seems like it would also work to insulate the exterior of the building. Too many people cheap out and don't put the insulation on before the vinyl siding or they put up insulation that is too thin. One inch or inch and a half is needed. Vinyl siding is a cheaper siding product but you do not want to cheap out on the insulation.

I three will watch this.

Kevin asks some really good questions.

One of your better segments... Actually long enough to get some good, solid info transmitted...

build the building on a compacted layer of foam glass; go for 2x4 walls (or whatever is cheap and thin); fill the cavity with plumbing, electric or other installations and cob/clay plasters for (thermal mass) temperature variation and humidity controll; internal plasters will provide air tight layer; insulate from the outside with whatever R value you wish (more is better) with continous layer; dont break the insulations with rafters, create the overhang with roof cover structure; follow passive house principles (its for free); get a cheap, low maintenance and not toxic house

For once I feel smarter after watching a KZfaq video! Lol great video guys great information

I’m on a farm in Washington state where we get a constant flow of water into our basement maintaining about 4’ - 5’ deep between March and June/July...or...roughly 40,000 gallons of water. The basement used to be 1500 square ‘ but previous owners filled all but 12pm x 12pm with gravel to stabilize the foundations. Right now I use two 2hp high velocity sump pumps that fill two 10,000 gal above ground tanks which provide irrigation during the dry months and the other 20,000 gal (roughly) is simply pumped back across to a drainage fed by artesian wells on the back of the acreage. I’d like to solve this issue completely but ground water comes up to within 8”-12” of surface every year. Everyone out here has to wait to plant and the flooding issue wasn’t mentioned at purchase. We are restoring this 112 year old beauty bit by bit but may need suggestions here

I'm going TO watch THE NEW This Old House premiere video tommorow

I too will watch this video

I am building with double stud walls (staggered) which solves the heat transfer path. I will be building with my utilities mounted on the wall inside conduit; no holes in the drywall for heat/air to escape.

Johns Manville used to make an R19 that would fit in a 2x4 wall😊

Rockwool take my money

Awesome video , what are those blocks I’m in between the studs ?

Not that it matters as much today with people wanting to be as sealed and efficient as possible. Years ago builders would use the full equivalent of the materials in a wall to reach the r value. Meaning, exterior sheathing is listed to have an r value of 1, sheetrock also has an r.value of 1. And those values count back then. In a wall requiring r 22, a builder would buy an equivalent r 20 and the building materials made up the difference.

That's why u should use Hempcrete and hemp/lime render Wyndmoor PA

Memory Foam Insulation Coming Next

Sure. Why not include a structure wide sealed air gap, vacuum pump it down, filll with argon. Then add booster rockets and go into orbit.

Great info! But I disagree with statement Kevin makes at 4:24. Code doesn't want you to have walls perform at a certain R value. Code requires a certain R value of insulation to be installed. So if you install the required R value you aren't below requirements. But doing these extra steps will maximize its efficiency

Rock wool is the best cavity filling insulation on the market second to spray foam for a lot less$$

Counting the 1/2" sheetrock inside, you end up with 8" of wall. What's a window that thickness cost in this opening they are working on? Say, using Marvin Integrity casement? What's that cost compared to a std. 2x6 wall window?

so vapor meaning H2O and "air" meaning O2 (8% Oxygen mixed with the other gases like nitrogen and helium)?

Guys that was fantastic I really enjoyed it. You provide a lot of very informative info. I do have a question and I know it hard to talk about when money is involved. This would have been a good place to do it. What would have been the difference in price to do the extra insulation as opposed to not doing it. I am sure you are very aware money always enters into the mix when you start looking at these extras. While the long term gain is great and the heating and money saved by the extra insulation, but how long would i take to recoup the extra cost.

isn't that little guitar riff in the beginning a jack johnson theme?

Double layer of sheaving, double layer WRB, one over the studs, and one over the outer insulation? Tight house solutions that few can afford don't help the many.

Why dont you guys check out T Studs? It has an R20 value

This is splendid content. Very informative. I didn't know about the method with two layers of vapour open still air closed sheets. I understand this is because of the extra exterior insulation. Would it not be enough to only use one vapour open but air closed sheeting? Put outside the exterior insulation? Can you explain why two sheets of vapour open but air closed layers?

What about closed cell insulation that is blown inside the wall.

Hopefully the price of this product will drop. Right now that's the only reason I don't use it regularly.

Johns Manville Make R19 That Fits Into A 2x4 Wall.

Do you still use plastic vapor barrier on the inside before drywalling?

I'm about ready to insulate my rim joints. My questions are 1) cost wise how does it compare to spray foam and 2) would you recommend this product over spray foam for that application? Thank you.

I have been thinking about similar assembly for zone 6 Canada , 3” comfortboard under siding and a rain screen, solotex mento 1000 for WRB taped and sealed, 1/2 inch plywood for shear, 2x6 studs with comfortbatt, intello for the interior air barrier, then a service cavity to eliminate penetrations in the intello. Filled with more rockwool and finally drywall. R12, plus r22, plus r6ish for effective R somewhere in the high 30’s. My concerns are water tight details around the doors/windows especially using North American flange windows and also at the sill with concern for rodents( mice) and insect penetration behind the rain screen. I would love to see details for install. My biggest concern would be finding a builder who actually would agree to do it........

What about the studs with insulation in them.

I am interested in the soffit detail - that seems the weak point and prone to ice dams.

what about foam backed ZIP sheathing.

Yeah that wall system should be super affordable...

Kevin should be wearing complete gloves. The exposed fingertips must mean he's freezing. Dan should have worn hat like Kevin and Jeff.

How does rock wool compare to close cell foam?

Doesn't that second layer of plywood, stop the dewpoint movement?

😎

you could get R22.5 in a 2x4 wall with closed spray foam

Can anyone say what that red loop bracket is on the eave?

I wonder what the cost comparison between that new type of insulation and a Standard fiberglass or even other forms

It's simple: Objectively, for an R21 you should (my observation) design from the stud. A 3.5 stud = R3.5 A 5.5 stud = R5.5 Therefore, design your total R-value from the stud. Therefore, guess what? Future construction will incorporate low permeability insul board to the inside face of the stud for an R3, R4, R5; &, high perm insul will be installed in the wall cavity; & high perm insul board will installed on the exterior. Eg. 3/4" or 1" t&g xps, .1 perm Class 1 (R4 or 5) a perm + 3.5" cellulose or batt (R13) + 3" Comfort bd (R12) = R30+ At the stud, objectively, 5+3.5+12 = 20.5+ My opinion The insul on the exterior works great as a thermal break in the summer, & the interior board insul works great as a thermal break in the winter. There is still only one vapor retarder ( the xps that meets 0.1 perm ) I think this assembly will be the future. Why? Because a 3.5 stud will work making it easier to retrofit an existing house.

😂 this is a perfect example of why people don't trust contractors. They said it themselves the home owner is not having this done.

Yep, because water vapor is H2O, and Hydrogen is a lot lighter than Nitrogen, which makes up ~70% of the air we breathe, water vapor is 'smaller' (less massive and less dense) than air.

I don't appreciate these Dew point scare tactics used by the Rockwool rep. If you live in a cold climate, then an interior vapour barrier is already standard practice and in the building code. Stop trying to scare people that their walls are going to get wet if you don't install exterior insulation!

Considering you loose about 70% thru the roof, 20% thru the structure portion of the walls an 5% thru the floors it looks like a waste of material especially plywood environmentally it’ appears to be a failure. Financially, I don’t believe it will ever pay in a lifetime.

Why aren't the houses made from poured concrete?

Vapor is not "smaller" than air

old intro music was better

Why do you make everything so complicated ? Thermasteel panels were invented ages ago. R21 , no vapor, water barrier required , no termites, no rotting wood , you can save even on a foundation if you build a shallow frost protected foundation and stuck panels on footing

is the older guy from Scranton? he holds his face just like Joe Biden does.

You End-Up With A House that Only Bankers Can Afford To Purchase. $$$$$

More Money On The Home Owner!!!!! NOT Good In These Inflation Days!!!!!

Back in my day, we used asbestos and it worked just fine. None of this new age materials for me and my family.

Im Going To Build Me A House Out Of 2x12. What Did The Native Americans Use?. Tent Poles And Animal Skins, No Problems. No EPA, No Rules and Regulations, Only Common Sense.