Confused about continuous insulation in Climate Zone 5
I’m planning a home in zone 5 (northern Utah). I’m so confused by all the differing opinions on how the wall assembly and different barriers should be installed. And I’m definitely not getting much help from my general, or his insulation or exterior subs. He’s definitely for trying out exterior insulation, and understanding the thermal break it can create, but he doesn’t even know his EPS from his XPS from his PolyIso. The insulation guy was somewhat helpful, but his expertise mainly lies with inside-the-wall insulation. The exterior guy was basically pretty whiny, first asking “why would you even do that when you can just do better insulation on the inside?’, and then complaining that his fasteners for Hardie Board (the house is primarily Hardie, with a few minor sections of thin-brick veneer) aren’t even long enough. I don’t know if Utah is just a somewhat unique climate having somewhat extreme summers and winters (near-zero for several days and a few weeks of teens in the winter; a one to three weeks of 100+ in the summer, and very very dry around here). But I’m hard pressed to find anyone locally to do anything outside of the ordinary. The only thing that there was no argument about was 2×6 exterior walls. But I’ve never seen a home around here built with exterior foam board, and never any foundation insulation.
Anyhow, after doing lots and lots of reading, my current personal design idea is:
* 1″ EPS
* WRB (just regular Tyvek)
* 1/2″ OSB sheathing
* 2×6 walls, insulated with flash-and-batt of 1″ closed cell spray foam, followed by blow-in-blanket fiberglass (www.bibs.com) filling out the rest.
My questions are:
*一些文章严格规定，需要计算外部泡沫厚度，以便泡沫的内边缘永远不会低于露点，即使是严格的内部绝缘层与外部绝缘的比例。这真的与EPS的交易相比要渗透比Polyiso更具渗透性吗？我只想在那里足够打破螺柱的热桥。
* Is the location of the WRB in the correct spot? Do I need any other air/water/vapor barriers?
* Should I avoid the closed cell spray foam, as it adds an additional barrier?
*关于固定壁板，我发现了一张硬皮板的音符，该记录是在> 1英寸的护套 +泡沫中使用毛茸茸的条，然后将硬质板连接到毛茸茸的条上。我敢肯定，外部人会发牢骚，但很艰难。
* What about the thin-brick veneer. Can that attach directly to the EPS? Or do I need to do furring strips, and then an additional backer-board to give it a smooth surface?
我感到有些沮丧，几乎要放弃连续的绝缘材料，只是做他们想做的围嘴绝缘的事情，别无其他。
GBA Detail Library
由气候和房屋部分组织的一千个建筑细节的集合
答复
Ccutrer,
首先，你能告诉我们你的名字吗？
Q. "Some articles give a strict rule that the exterior foam thickness needs to be calculated so that the inside edge of the foam will never be below the dew point, even going so far as a strict ratio of interior insulation to exterior insulation. Is this really as big of a deal with EPS that's more permeable than say PolyIso?"
A. Yes, you need to follow the rules if you hope to avoid damp OSB sheathing. Even 1 inch of EPS will reduce the rate of outward drying enough to put you in the danger zone. The solution is simple: follow the rules, and install a minimum of R-7.5 of exterior rigid foam. To learn the rules, as well as the logic behind the rules, read this article:Calculating the Minimum Thickness of Rigid Foam Sheathing.
Q. "Is the location of the WRB in the correct spot?"
答:(阅读本文Where Does the Housewrap Go?
Q. "Do I need any other air/water/vapor barriers?"
答：每堵墙都需要空气屏障。您不能购买空气屏障 - 您必须创建它。更多信息在这里：Questions and Answers About Air Barriers.
问：“我应该避免闭孔喷雾泡沫吗？”
A. Yes. If you are installing exterior rigid foam, the spray foam between the studs is unnecessary, expensive, and damaging to the environment. For more information on this issue, see these two articles:
在螺柱之间安装闭孔喷雾泡沫是浪费
如何设计墙
Q. "What about the thin-brick veneer? Can that attach directly to the EPS?"
答：我不喜欢薄砖贴面。从绿色建筑的角度或设计师试图选择具有外部刚性泡沫的房屋的逻辑壁板的角度来看，这不是一种壁板类型。如果您坚持使用薄砖的贴面，则应遵循单板制造商的说明。
马丁，
Thanks for the reply. Sorry, I just signed up and couldn't see where to put my name. It's Cody Cutrer. I think I have it set in my profile now.
Cody,
我理解尝试做一些与您所在地区的通常方式不同的事情的挫败感。我遇到了许多相同的问题，在密歇根州的5区建造了我的房子。（请参阅有关机场房屋的系列。）我很幸运的是，我的总承包商和框架分包商愿意学习和尝试新事物。框架子安装了外部泡沫和壁板。绝缘材料不需要做任何新的事情（除了以不同的方式进入阁楼，事实证明这对他们来说是太大的变化）。
We used a combination of Hardie Board and brick veneer over 2" of graphite infused EPS. Furring strips were used behind the Hardie Board but not behind the brick. Attaching the furring strips required the contractor to procure a different type of fastener than they normally used, but it was readily available.
推动当地承包商基础上的一些人学习新知识，这对您的社区来说是一项宝贵的服务。提供服务将需要您进行大量学习。您找到了正确的网站来进行学习。该网站上的人们将感谢您正在做的服务，并为您提供鼓励。不要期望当地人得到太多的赞赏。这也可能花费您一些钱。我为我的房子上的额外物品付出了溢价，该额外费用用于攀登学习曲线。
嘿，科迪，在我的项目中，我发现承包商几乎没有帮助。一旦您摆脱了几十年来他们的方式，您就可以自己。他们遵循他们所知道的教条，非常不愿意采用新想法。尽管有一些很好的建议和新技术，但它们还是向前耕种，对盒子外的任何东西都至关重要。这个网站非常好，阅读马丁给出的所有链接等等。您需要教育自己超越承包商，或者找到了解这些概念的新知识。我也建议BuildingsCience.com，一些YouTube的内容非常好，搜索建筑科学，在此网站上询问问题。阅读，阅读，阅读。考虑本地建筑科学或能源效率顾问。
Hi Cody,
I'm not a pro, just a DIYer/homeowner. First, I've learned tons in the 4 years I've been reading Gba. It is an amazing resource.
A few thoughts for you:
- 在镇上还是在树林/丛林中的地点？如果您在该国，请查看Roxul Comfort Board。比EPS更透气，易燃易燃。更多$。外部绝缘的技术指南，有很多细节http://static.rockwool.com/globalassets/rockwool-na/downloads/technical-guides/residential/comfortboard80_installation_techguide_en.pdf
- if you are going to take risks with the insulation thickness, perhaps sheathing with plywood is a better choice? It is much more moisture durable and much more breathable under moist conditions. One blog about it:http://mattrisinger.com/osb-vs-plywood-sheathing/
- I love Gba but you might look at protradecraft.com as a complementary resource. The videos on there vary from this old house garbage to videos actually showing tradespeople dealing with the challenges that more insulation brings, etc. You might reach a contractor via video vs using a PDF.
- 我没有使用ZIP系统产品（其他然后在室内尝试胶带……太臭了！），但是在Zip R（带有或没有皮带）上出售您的承包商可能比绝缘上的皮带更容易。一个PDF查看：http://www.huberwood.com/assets/user/media/ZIP_-_Rsheathing-SalesSheet-SingleFamily1.pdf
- You probably know that in your cold winter climate, polyiso is not a good solo exterior insulation due to blowing agent condensation (~-5F?). You can use it behind EPS or skip it.//m.etiketa4.com/blogs/dept/musings/cold-climates-r-5-foam-beats-r-6.https://buildingscience.com/documents/information-sheets/info-502-temperature-dependent-r-value
希望有帮助。