Super Insulated Walls on a BUDGET?!? | Double Stud Walls Explained
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- เผยแพร่เมื่อ 28 พ.ค. 2024
- If you’re building on a budget, but still looking to super insulate your home to maximize energy efficiency, double stud walls are one of the best ways that you can get a high-performance home without breaking the bank. In this video, we discuss how to design and build an affordable double stud wall assembly, some of the planning considerations you need to be thinking about, and how they compare in cost to some of the other insulation options that we have on the market.
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0:29 Double Stud Construction Considerations
3:21 Details and Specs
8:59 Windows
11:16 Cost and Budgeting
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I got more out of this one video than I did from dozens and dozens of other videos. The price breaks are fantastic! You just saved me days of work. Please do more.
So glad to hear it was helpful! Cheers!
@@ASIRIDesigns absolutely. Thanks a lot
I could be wrong, since there are so many different materials involved, but I think the double wall system also allows for more acoustic insulation. That may be a consideration for some people, particularly in an urban or busy suburban area.
I have bigger issues with interior noise transmission than exterior.
I’d be curious to know how the cost of this compares to ICF?
Great stuff as always. Double walls also provide a huge reduction in sound transmission for those in noisy neighborhoods. If maximum thermal efficiency is the goal, then double walls are practically impossible to beat. However... the labor costs are a HUGE factor here. The cost to install exterior EPS/XPS will be drastically cheaper than having a crew frame out double walls and the extra details for fenestrations. And for most areas of the country, the difference between R40 (R21 cavity + 4" of rigid foam) and R60 might not even be noticeable. You'd probably be better off putting that extra money into upgraded windows and doors. Building double walls with double-pane windows would be pretty pointless, for example.
No extra window details for 4" of exterior foam? I agree that going from 40 to 60 won't be very noticeable, diminishing returns.
@@rodfreess6019 Some extra details for sure but it's flashing and trim/bucks which you would need to do in either case.
I was able to understand everything in this video thanks to your vocabulary and delivery of information. This video is incredible! Great job
Same - extremely efficient & detailed & concise.
Great video love the density of information here, as well as great explanations on issues with the double wall system, and why they exist.
Regarding the 27% increase in material cost however, the amount of cost for labor will be significantly higher then the exterior insulation option,
As that requires no special planning, education or oversight of the workers.
I will say that, at least theoretically, the performance of this double wall can vastly exceeded that assembly,
But I think it’s gonna be roughly a tie cost wise.
Dense packed information. I would love to see those kind of cost reflected in a future video too!
I haven't watched any other of your videos but this single handedly caused me to subscribe and and see what else you got. Absolutely amazing video.
This is some of the best and most concise advice I’ve found online. Very helpful work here sir.
I would love a video on leaving rafters exposed and insulating outside of the roof. We haven't figured out best way or a way we like yet. Being able to leave rafters exposed with roof board saves finishing money.
In Germany there is a type of wood based insulation popular that you can install onto the rafters. (Steico Dry) It is so stable that you can walk on the temporary wall and is weather proof for a couple of weeks until the finished roof is installed.
As a bonus: If you use these wood based insulations you can build you roof without a vapour barrier because it is permeable and capillary active so that condesing water is transported to the warmer (and dryer) side of the insulation.
Steico offers details for timber framed buildings on their website, the roof is basically from the inside to the outside: Rafters, Insulation (Steico Dry), sarking membrane (for weather proofing), roof battens, some sort of roof tiles.
It is a more expensive type of insulation but you can renovate your roof completely from the outside and keep your rooms as they are without having to worry about the correct vapour barrier.
I was warm and cozy just watching this video.
Well done!
I built in1986 , staggered 2x4 stud walls 5” apart with 2 r19 fiberglass batts. 1 disadvantage is if or when mice get into the wall cavity they can travel freely. Otherwise I would do it again!
Needed a fire block stud every 10 ft...
If the cavity is filled with insulation isn't that a fire block?
I'm totally sold on the double wall design. At the cost is daunting. I have to pay for it as I go. I don't have any kind of a construction loan. And I'm on disability so it's limited funds every month.. my idea was to put up a steel building, like a pole barn, and then frame up a house on the inside. Because I can do that out of the weather. And I can also leave a big enough walkway all the way around for maintenance on the inside of the pole barn.
Not your typical construction project LOL.
But doing it that way it gets me out of the weather, and I can put it together one room or wall at a time.
You know what I would love to see you do? A similar video on the all-out best wall assembly you can imagine, disregarding budget. Joe Lstiburek has a brief mention of the "institutional wall" but really doesn't go into details. I'm curious what something like that would look like. Basically infinite budget, but using actual building materials (no stuffing theoretical aerogel in the wall or something like that).
Perfect wall IMO.. will be a "p
Perfect Block" wall. No infinite budget needed.
@@mindtrap0289 Interesting, could you explain more? I'm not a builder or structural engineer or anything, but just curious. I tried googling "p perfect block" and "perfect block wall" and nothing specific really came up.
Outstanding! Thank you for the clarity of presentation, the walkthrough on the details and the cost breakdown.
I was building one of double wall house. Same idea but just regular vapor barrier (polyethylene)inside and regular membrane outside. Wood siding. Blown in cellulose insulation. So many moments about moisture removal weren't addressed a way video suggest. But it has continued insulation through gap between wall and ventilation in attic, so in theory moisture can get out this way, not horizontally, but vertically.
Labor comparison would be great!
Love the content! Best explained engineer TH-cam channel
I wish you would’ve added to this video how to do the roof/ceiling installation detail design
Great video. Detailed explanation, quick, to the point. Thank you.
this is a great video with clear explanations and great illustrations/ cost basis. would love to see more
You answered all of my questions about windows and building science (i.e. how is the water management addressed at the bottom of windows to prevent moisture from entering the house.) and I like the price breakdown of the different wall assembly options.
I liked the double top plate detail that leaves the insulation cavity all the way floor to ceiling. Nice.
Interesting presentation, thank you. Also my compliments on your details and thorough walk-through.
Wow! What an awesome video! Thanks so much for sharing your expertise! It’s given me a lot to think about for when I start the build on my lot here in Texas! 🤠
It'll be interesting to see your comparison of the T-stud or thermal stud wall assembly.
I actually have an article breaking down my thoughts on the T-Stud that I wrote a while back, you can find it here: asiri-designs.com/resources-1/f/is-tstud-wall-framing-worth-it?blogcategory=Walls
@@ASIRIDesigns vip versus milled log ?
Very nice!
One thought I'd like to run by you is regarding the windows.
Living near a major airport, I've seen some applications where two dual pain windows are installed, one behind the other.
The deep walls in your application look like a perfect fit for this, but I was wondering what your thought is on it?
Thank you kindly
Great video, I'm looking to build a home in Calgary in a few years so this was insightful. I will be watching more
Incredible content! Thanks so much.
Excellent details!
We have worked with both double wall and exterior Ci. And I would agree with your assessment in terms of cost. Another benefit of a DSW is that at least from the exterior is that flashing and finishing while extremely important to do correctly is quite simple and familiar to most trades.
If i was building a double wall assembly, which i always thought of. There would be NO insulation between the interior wall stud, and the vapour barrier would be behind the interior wall. That reduce the potential of hole and leak in the vapour barrier caused by simple things like hangers, frame hooks, electrician, plumber etc... it would leave 2.5 or 3.5inches to run utilities, to install blocking, to hang stuff without perforating the vapour barrier
He shows furring strips on the interior that does this. 7:27 but it's a good point to make.
What you can get away with depends on the climate.
The problem is that Americans are addicted to wooden walls in the west. Such a disaster
Great job. I've been looking at 2x6 24 OC walls with Zip and rigid wood fiber insulation on the exterior but now I'm looking at double stud walls again. So many choices and so hard to decide.
I wish we could get this quality of design and content to help with building in hot and humid climates like 1A.
It’s so hard to find details for zone 1 :(
Fear not! I've got some videos planned for my friends down South :)
Thank you for your thorough explanation. My concern is finding tradespeople to do the work exceptionally well at an affordable rate.
It would be interesting to know how many years the return on investment would be. It seems the more innovative ideas in reducing electricity costs the more the power companies raise their prices. One must factor in the added increase in power in the ROI.
Great video. I appreciate the detailed wall assembly diagrams. The pace, visuals, explanations, all good.
Question: Do you use standard sized outlet boxes or a smaller box to fit into the service cavity depth?
Great video! Thank you. I’m also curious about the comparison to insulated CMU systems like comfort block or Omni block.
i did precast wall with styrofoam as the bottom mold. It got me 4" of styrofoam all around my house and another 4 inches of concrete. I feel the materials are a bit more expensive than wood, but my walls went up in one day and are made in a factory so far less labor mistakes.
great details
Thank you! More coming every week.
Thanks so much for the excellent details on this and the cost comparison. I'm interested in discussing a project and filled out the form on your web-site.
Great, informative video mate. Been designing my off grid home for over a year and the insulation part has been a nightmare. Prices for exterior insulation are near highway robbery.
For the people living in the US this will of course make your house hurricane-proof as well, which is a nice side-benefit.
As a person living in Sweden the shoddy building standards in the US honestly amazes me, triple-glazed windows here are standard, our house is 16 years old now and has triple-glazed windows all-around, proper insulation and a ground-source heat pump, something only a fraction of all the new homes in the US seemingly have. Seems very short-sighted since it saves you so much money in the long run.
Sweden is not even close to the USofA with regard to climate conditions. In the US, the demand is on cooling the indoor environment. In the sunbelt we can have up to 8 to 9 months of cooling required where in Sweden one may never see the need for additional cooling for interior spaces.
@@Wegl79 Well insulation works both ways. It has the same effect in reducing the amount of AC you need to use as it does in reducing the amount of heating you need to use.
If you'd place a Swedish house in Arizona it'd still use less than half as much electricity as a US house, because it'd barely heat up in the first place and as such wouldn't need much AC.
I believe that using 4inch poly iso, Zip R 12 sheathing and an r16 2x6 wall will be the cheapest option to get r 53. If your using poly iso as an owner you should look for reclaimed 4 inch poly iso at about $20-$25 a sheet.
Wonderful video and amazing diagrams. Very clear and simple to understand. How does using something like Zip R-9 and 2x6 wall compare to a double wall assembly? Do you have a sense of where it would be as cost comparison?
Even on an R-20 wall most of the energy loss occurs at the windows and doors. Upgrade them and make them smaller for real energy savings. Energy analysis will identify when it makes sense to upgrade the R-value of the walls.
We use square notched timber frames. Window and door bays get spray foam and the bays next to them. The doors and windows get thermal breaks not thermal gaps around them. Usually zip sheating and mineral wool. The timber frame actually saves money on labor and lumber. The mineral wool in my masonry north wall and under slab was expensive. Building a passive solar earthship like Goldie and Matt's but no berm or tires. Plus their framing wasn't well thought out and I needed more roof pitch. I need 70 psf snow loads and 6 foot frost depths also. We use glulam 2x10's or 12's for beams. At 50-75$ for 16 foot beam and can make longer. Lvl need too much lateral bracing. A.I. really helps with cost and design considerations. Sure you have seen how flimsy lvl can be. Which glulam beams allow for 2x4 or less on the flats for double stud walls since not structural. Price goes up on wood every time it gets milled down and more wood stamps cost money too. But if you don't have local lumber mills the price for timber frame jumps. As the cost of shipping increases. It's why we use local masonry material and timbers. Right now shipping on rock and stone cost as much as the rock and stone. 800$ for 40 tons cost 800$ to be dropped on site. We do a lot of masonry work. Why give the cement company the money we could get for labor. We build a lot of A frames and skillion designs. I see where the double studs would be better like earth quake zones. If I build a walk in cooler I will use double studs for sure. Because hvac equipment hanging and on top of them. Set of framing for equipment and one for structure. Minimize the vibrations.
Loved the video, there’s so much great information. Would this be something we could use in a state like Texas with higher humidity and heat?
Amazing information and presentation. I subbed after your vid on vapor barriers being used incorrectly. Your channel has an in credible amount of informative videos and it is going to get big.
How would you go about insulating a timber frame home with fully exposed interior framing (posts, beams, bracing, rafters etc)? Structural insulated panels (SIPs) over the outside of the timber frame seems to be the standard, but I don't see many references to SIPs outside of that use case. SIPS seemed to be a hot topic about 15 years ago as the new wiz-bang super-insulation solution but I wonder if there are vapor problems with OSB glued to rigid foam on both sides and why they don't seem to be common? How would you tackle a timber frame?
What are your thoughts on using a Zip (R6) sheathing instead of the wrap and plywood if building a home in Climate Zone 3 (northern Oklahoma)?
We run AC about 90% of the year and turn the heat on maybe 5% of the year.
Big fan of your videos… thank you.
Zip-R provides a nice thermal break. But you can get the same or better results with OSB/CDX sheathing + WRB + rigid insulation. Go with whichever is most cost effective. Prices fluctuate a lot these days.
Nice!
How about 2x4 covered by 3" tight foam board then the covering, and drywall inside (with or without blown insulation)
Loving this channel about to build in Fairbanks alaska
Raising wall R-value from 0 to R-10 cuts 90% of heat loss from one side of the wall to the other. Increasing to R-25 only cuts another 6% of heat transfer. Increasing to R-35 only cuts another 1%. Source: Rural Electric Nebraska magazine.
What if you did precast concrete walls .There's a company where I am in NC that gets R 22 from their walls .I'm thinking basement and first floor.
Having worked in construction, I must say what's on paper vs what's in real life are two very different scenarios. You want to have air membranes on the inside and outside of your double wall and the only way you guarantee the performance is if the membranes are more or less 100% sealed. I am yet to see any project in real life that lives up to that standard. Even if the carpenters get up to almost 100%, there will be other trades that will punch holes like nobody's business or the home owner will make modifications/renovations, etc later on which will compromise your system. The moral of the story, the simpler, the better. If you must have a membrane, have only one and provide ventilation opportunities on both sides of that membrane for moisture to dry out. That's a much safer bet in my opinion. So keep structure separate from insulation and keep insulation on the outside of the structure. My two cents
Excellent tutorial. Much Appreciatted.
The cost of this breaks down alright if you've got the money. I'm really curious as to the cost of repair however. Someone with a handheld drywall saw can poke thru that vapor barrier inside. and if you live somewhere with hurricanes. the outer wall could easily be hit and damaged with debris. again damaging the vapor barriers. Not much you can do when your house gets wacked with debris and you've got 7 more hours of whirling rain and wind to go. basically blowing it into the damaged area. Cost of repair is very important to me.
maybe consider "celit" as a wheather proof sheating on the outside. or using an extra rigid wood fiber insulation board on the outside. this olaso helps with condesation problems.
Would the ZIP system be an option for the exterior?
Do you think it would be bad thermally speaking to use a 2x10 plate wjth offset 2' o/c 2x4 walls staggered?
Our builds (cabin first, house later) are up against native forest which is susceptible to fires. I want steel or fibre cement cladding and galvanised steel spacers to hang the cladding off of, and some kind of heat proof insulation on the outside as a priority no matter what happens on the inside. Cannot get rockwool here, sadly. I suspect glass fibre would melt if temps extreme enough and only delay the catastrophe. Am I screwed or is there another option?
What about fire block requirements? Do you need to do anything else? What about tall walls? Can I use this with stucco?
How are roofs insulated in double wall buildings?
Gtreat video. Would the labor not be × 2 , because building 2 walls ?
Seeing that you're in Oregon, I'm curious if you've had any contact with the people at BCIT? They would have some interesting input.
I have an idea for a video if you are intrigued by my question:
What would be the optimal way to blend high performance wall design with low frequency acoustic absorption? I would think would would need to move the air sealing barrier further into the cavity, and keep an porous membrane as the interior finishing. Obvious it wouldnt need to be the whole wall assembly - but there must be a good tradeoff to make.
Regards - Home theatre/ Hifi enthusiasts everywhere.
05:00 - Could you treat the OSB with some anti-fungus to make it a useable solution?
I’d love to see the cost calculated with labor and materials added…
Just in his location,
All the additional requirements in the specs cannot be compared apples to apples .
Since ZIP is based on OSB, would you not recommend using ZIP with a double stud (12") wall assembly?
Personally, I'd avoid ZIP for double stud walls that exceed R-40 to be on the safe side. I like building in as much redundancy as possible when it comes to these double wall assemblies. Some people have had luck using ZIP for double stud assemblies, it's just that they're going to be less tolerant of incidental moisture.
So, my bone to pick with this video is that he doesn't seem to account for the cost of the increased size of the structure to compensate for the extreme wall thickness. I would imagine that would eat significantly into the cost efficency of the wall assembly. If you add an extra six inches of wall all the way around a 40x40 structure, that is approximately 80 Sq ft of lost floor space. So now you have to add about 100 Sq ft to compensate. That doesn't sound like much, but it is about an 8% increase in the overall size of the structure. 27% + 8% = 35%. That is rough math, but you can see that you are now much closer to the cost of exterior rigid foam. And, considering that you can use comparable or slightly cheaper, materials with exterior wall foam, it probably comes even closer.
Additionally, if you live in an area where R40 is way overkill, the numbers probably are much closer. That is because rigid foam scales better with wall thickness than double stud constructions.
Can you speak to the labor cost between double stud and double outer layer rock wool? Seems like you might end up saving money on labor and window products with ridged rock wool. Also, if you’re going past R40 on the walls.....do you need to?
Would it be possible to do a double walk assembly with metal siding?
Ofcourse! As long as the siding is installed on a rainscreen.
Does all of this apply to fiber glass? One would think it naturally more water resistant. Im betting labor costs equalizes all of these methods quite a bit too.
Who cut the trim on that window @2:24!?
On thick walls using a pair of windows one on the exterior and 1 on the interior seems like a nice solution. Has anyone done this with success?
How do you guarantee that the installers won't leave any gaps in the air barriers or flashing? This method is dependent on getting those details perfect.
I am going to be building in Maine and me and my Wife will be building it with an extra short term time to time helper. What about using Zip Systems Sheathing as it has a WRB weather resisting barrier (instead of 5/8 inch CDX) and with the off-set of the 2 x 4's and using Rock wool Batts with an other off-set grid pattern and or using your method of Dense packed blown in insulation and the added rain screen of 1 x3 prior to the exterior siding??? Reason why I ask about using Zip System was because it already has a WRB and 2x6 24 OC, *Note I am going to be installing an ERV for air circulation... I like your approach to save money and better insulation on a double walls... Thank you Liked#41 N Subscribed!!!
I would be careful with using the ZIP for a double stud wall especially in colder climates in super insulated assemblies. Some people have had luck with it, but at the end of the day, it's still OSB and will have less drying potential than plywood. If you are going to use the ZIP, I'd limit your wall assembly to R-40 just as a precaution, and really focus on doing a good job air sealing all of those connections. You could use a combo of Rockwool and cellulose, but you're going to end up paying more for the Rockwool Batts. Rockwool also does blown-in products. Cheers!
@@ASIRIDesigns Well, I would be interested in the BUDGET double stud R-40 wall because its more affordable and not the 10 inch Super wall, would be more expensive for us...Also there is a new Wood Fiber company that I have to check out and there Manufacturing just opened up in Maine too:)
@@ASIRIDesigns:: I had in my head a double 9.5” wall assembly, but with the studs in line so I could add gussets at each stud to try to get some more structural rigidity from the interior wall…
I’d use dense pack cellulose, then sheath it with Zip (maybe R6?), then the rain screen and siding.
I wasn’t going to use a vapor retarder on the inside wall. I’m in Climate Zone 3, OK, so I was thinking I’d be okay with the assembly above since we have AC on 90+% of the year and rarely turn on the heat.
Am I way off track for my climate zone?
@@2point..0 I know of this plant. What area are you building in?
@@ChristopherCurtis My Wife has received a Job Transfer in Scarborough, so we are moving back to Maine and need to find a rental... (And as a matter of fact we maybe taking a ride up there next week) Then we can look for land little north of their and buy land to build on... Where are you located ??? Thanks for noticing!!!
If we design a wall with R40, how efficient do the windows need to be ?
window efficiency will be critical to increase wall R value.
I'd like to know that too
Windows are never efficient compared to even the most basic wall. Installing any window is a sacrifice to efficiency in exchange for beauty. So design your building accordingly. Smart, minimal, and small, and non-operable window placement will always beat trying to increase the efficiency of a window itself. It's possible for double-pane to be the smarter (more economic ROI) choice over triple-pane if you optimized accordingly, and I'm not talking about the whole "passive" house element: which is a good option when you really value beauty, but are still moderately concerned about efficiency. A modern non-window home will always perform better than a window home, regardless of how well you place the windows, or how much money you throw at the windows.
Are you incorporating any of the Zip R sheathing in your designs?
Yes, in fact I spec'd it out on my most recent project. Great stuff if you want to simplify installation for the crews.
The windows are R5.
True double stud walls are a pain to build and especially to trim. EVERY extension jamb,, and every door and window requires it, every part must be a custom width. I KNOW, I have had to do it, on several houses. What WORKS are truss studs. Built in a jig or fixture so every framing member is exact inside to outside. A couple dollars more? 15% premium. Passive solar, super insulated, works well in tandem. Doing one or the other increases cost without increasing performance.
Wouldn't the staggered studs make batt insulation super easy too? The batts would overlap and you could run electrical conduits between the inside and outside framing.
How would this compare with ICF builds?
Why is it....on 90% of residential construction related vids there are ALWAYS 2 or 3 of you ICF guys popping up?
I mean it doesn't matter if vid is about foundations, framing, insulation packages, or HVAC...there is always at least one of y'all.
Is there an ICF industry sponsored comment farm that guys monitore construction related vids and pump up the comment zone? You know like a propaganda "shaping operation"?
Blink once for "yes" & blink twice for "no"
It may cost more for prep longer roof overhang than the money you save . I'll stay using pir
Not sure that vapor barrier on the interior wall is such a good idea for hot/warm Southern areas, especially within, say 100 miles, of the Gulf.
Our temp "delta" between interior & exterior in deep winter is only 45°F & only for few days. Unlike great lakes region or inland Mid-Atlantic "delta" of 70 °F for week on end.
Yes, this assembly is definitely not for hot-humid climates. I'd push for exterior rigid foam insulation instead to serve as a vapor throttle instead of a double wall.
What is the cost impact of a larger foundation if you need to maintain a minimum interior size footprint. Also, can you provide any insight into how this transitions to an insulated riof with conditioned attic space, continuity of your barriers and ecternally attached eaves? Awesome video BTW showing multiple ways to achieve outcomes.
A larger foundation if building from scratch, is not really a cost at all. Adding more foundation to an existing foundation will cost a bit.
Unless you've already maximized the footprint allotted by your State. For example, In some States the maximum is 5000sqft footprint (measured by exterior walls) before taxes go up and environmental land needs to be allotted for wildlife refuge open space. Then the cost is just a waste of money.
But, ppl looking to save money probly dont have 5000sqft home to begin with.
I may be the exception to that. Looking for 160+ acre land to build now, and I dont have millions to invest in it. But still need a huge house for all the family members. Another topic entirely.
I don't know when I will ever have the chance to build a house, but this information is still very interesting. Currently, I'm living in about as low performance of a house as possible,...still, I can dream. One concern I would have with building walls as described here is that in the future, people would be unlikely to take proper precautions during any repairs or remodeling. Even with a 1.5 inch service cavity present, would the next person not end up popping holes in the vapor barrier to install new light switches or receptacles in standard electrical boxes?
The additiona materials and labor would take decades to break even, but if your client wants that fuzzy feeling go for it.. We like rich people spending money. Me, Ive learned about the point of diminishing returns so R30 walls are plenty, as long as it's air sealed well. It's the attic we need more fluffy stuff in and that's easy.
What if you used aircrete with this? 🤔
R-60 on your walls? Do we really need that? I think it would be better spent in the ceiling/attic/roof and on air sealing the building envelope.
At R-20, you have reduced heat flow between surfaces by 96%. This video is all about going after that 4% difference from R-20 to the "ideal". Look for ways to minimize thermal bridging and forget about the rest. IMHO.
insulation is the only thing in the hose that pays for itself. i rather have it than new floors. because every dollar you spend on doing it better pays itself back EVERY year.
Heat is lost through the roof not the walls r21 on walls is plenty
Ich baue seit 30 Jahren holzrahmenbau. Das System kennt man in Europa gar nicht. Ich verwende tji joist Träger 300mm oder 356mm. 8% holzanteil. Der Rest ist eingeblasene cellulose Dämmung. 👍👍🇩🇪
I designed an built my house starting at 25 yrs old after reading Mother earth news and everything I could find on super insulating and the local building codes for guess 5 ish years, I am a millwright so the drafting, building ect... was something I was comfortable with, also I live in Canada which is very dry in winter with short summers, the foundation is 24 inch thick cement with a floating cement pad sitting on 8 inchs of foam with vapour barrier , the walls are typical 6 inch studs ,outside plywood, tar,papered , then flagstone, they have firestops,insulated,then vapour barrier, then 3 inch airgap , then built another wall 2/4 with firestops holding the electrical , insulated , vapour barrier , drywall , took 10 years to build 2 summers were digging the foundation by hand , it's 2 1/2 storys and about 3000 sq ft , the roof is trussed an comes out to r 60 , the walls r40 , half the house has a crawlspace, insulated and vapour barrier where the plumbing ect... are under the kitchen,bathroom area , the windows are glazed double pane, I think the outside walls breath through the tar paper and cement somewhat and the inside walls I dunno, so far no mold , unless your really anal and seal all the electrical outlets an stuff your going to have air movement , also you have to consider the dewpoint in the wall, where it is, mine is on the outside face of the vapour barrier on the outside wall that breaths, your wall is solid insulation so ? third of the way in I dunno something like that though, finished this house 35 years ago an have no regrets, some things with what is available today I would probably change , mostly the mechanical it has come a long way , I used pink fiberglass insulation today would use that green steel stuff that doesn't burn and is sound deadening, used that in my workshop an it's good stuff but wasn't made when I built the house, the house is very slow to change temp and in the winter if it's sunny will heat itself , it has heavy thinsulate curtains that keep cold/heat out/in, dunno what it would cost to build today i'm guessing alot, the inside walls are fully framed with headers ect... you could remove the outside framing an still have a house as they are framed today, anyone building their own house um if you want to save some miserable work hire someone to do the drywall because that really sucks, aside from that i'm pushing 70 and the work was worth the effort my wife of 49 years an I love it an would never move unless forced by old age. my 2 cents
How do you meet the horizontal fire blocking code R602.8 Item 1 with a blown in insulation?
Gusset plates connect and close off the top of wall/necessary horizontal connections.
If you are using a double stud wall, why not use 2 X 3's?
The info in this video is good and accurate. BUT anyone considering using this system should check out a "sip" system first. Better results with far less effort and as a bonus the longevity of sip systems doesn't rely on tape seams or later trades destroying the barriers. But thanks for the info.
To make an apples to apples comparison with external insulation, you need to include the cost of extending your foundation/slab/floor by at least 7.5" to maintain your interior square footage. Then the double wall requires more labor so exterior insulation might be quite a bit less expensive than you calculate.
And then put dbl glaze windows in LOL.
I recently built a 14'' double stud wall for a slab on grade house. The outside load bearing wall is 2X6, 2' OC with 1/2'' plywood. It is cantilivered 2'' past the foundation and then the foundation is wraped in 2'' of insulation that then has stucco applied to the exposed areas.
Another practice I use is to not stagger the studs as it is not necessary with all the insulation in between. Crowned studs can be crowned opposing each other then tied in the centre with a narrow piece of plywood to straighten them out.
Consider applying smart vapour barrier to the interior side of the interior double stud wall to create the service cavity instead. Perhaps one would have to create a larger space to reach desired R-value but would eliminate the extra strapping
This works too! We like the strapping/furring over here since we won't have services buried in insulation, but you can absolutely locate the smart vapor retarder mid-wall.
Your content is helping me be a better builder, thanks for your response!