围绕Zip-R护套的担忧
大家好,
我是一名房主,很快将在安大略省南部建立新的定制房屋(气候区6)。
我正在与一位经过被动室认证的建筑商合作,他们将其墙壁组合带到工作地点之前。
他们的标准墙件组件是:干墙 - > Intello Plus,2×6螺柱墙壁带玻璃纤维腔绝缘(〜R21),Zip -R9,0.75英寸降雨隔离,外部覆层
我一直在阅读/聆听/学习近几个月来建立科学的所有内容 - 但是远非专家,并且完全承认一点点知识可能是一件危险的事情。
Reading some of John Straube’s work suggests I need at least 37% of my insulation on the exterior…and possibly more in order to control for possible condensation issues.
我有点担心在我的气候区域使用拉链。
- OSB护套,我认为我更喜欢使用胶合板以提高透气性和更少的水分灵敏度
- Polyiso泡沫,这意味着R值将在非常寒冷的天气中下降,这正是在最大的凝结风险时。因为21/9的比例对我来说有点不富裕,但是如果R9实际上表现得像R6,那么我会更加担心
- 此外,我现在已经意识到,邮政编码在OSB护套内部具有连续的绝缘材料,这对我来说似乎有些违反直觉。现在,我无法弄清楚凝结平面的位置……在聚-ISO符合2×6框架的点上吗?
至少,我要问升级到Zip R-12 system if we go down this path to buy me a bit of extra buffer from condensation (21/12 feels like i’m in the right ballpark…polyiso cold weather issues notwithstanding). I’m happy with the use of the Intello smart membrane on the interior, but am inclined to change to a different cavity insulation — possibly Hempwool — for the combination of indoor air quality and its moisture buffering properties.
放大一秒钟,我想知道我是否要过度思考这个问题?该建筑商非常擅长使用ZIP和使用此系统进行空气密封组装。Their trades are really familiar with Zip, how to execute all of the taping/sealing needed, etc. We’re aiming at something along the lines of ACH 1.5 or so (the house has some complex geometry where aesthetics win-out over comfort/energy concerns).
But I wonder if I’m better off letting them proceed with a Zip-based wall design, or should I push for a different system using Plywood sheathing and an exterior insulation like Gutex (like the system 475 recommends) or possibly exterior mineral wool?
To summarize, I guess my question is: if they’re less good at air-sealing with unfamiliar products, does that mean I completely undo any benefits I may have gained by switching to a more robust assembly? And if so, should I just hold my nose and stick to the Zip System?
谢谢!
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
答复
嗨,麦克斯韦,
我会给您的问题一个问题,并说我认识或与之交谈的绝大多数建筑商非常喜欢使用Huber的拉链系统。您提到的谨慎的空气密封是关键,这是点对点。但是,如果您的构建器经过pH认证,并且习惯于将ZIP系统产品作为其(非常受人尊敬的)标准墙组件的一部分,那么我的非专家意见是您掌握了良好的手段。如果您还没有,请查看有关GBA上有关ZIP的一些文章。它们可能会让您感到更舒适,并引发一些您可以问到建造者的问题。这是一个首先:Working With ZIP System R-sheathing。(作者现在正在建造自己的房屋,并将Zip r用作主要的空气屏障。)
麦克斯韦,
39%的比率适用于只有III类温暖侧蒸气屏障(即油漆)的墙壁。借助Intello这样的智能蒸气回线器,可以将比率推动而不会出现问题。在安大略省建造了2x6墙,带有R5刚性和内部聚(少于39%)的墙壁很长一段时间没有问题。
我认为您的建筑商不喜欢R12拉链。除了额外的成本外,还要钉上钉子,因为您需要购买特殊的指甲,以换取所需的额外长指甲。如果您在自己的位置进行能源模型,您会发现从R9到R12几乎不会改变您的年度能源使用,而不是花费您的效率美元的最佳场所。
如果您的构建器熟悉Zip R,我会毫不犹豫地使用它。
麦克斯韦,
I have built two houses with ZipR and really like it. Some people dont like it for various reasons and I understand their concerns. As far as moisture, Akos makes a good point. A few differences with ZipR that are important. 1. The foam is vapor open, not like tradtional foam over sheathing. 2. With the sheathing being the most vulnerable and right next to your 3/4" airgap, it has significantly more drying potential than being buried under foam. If it is what your respectable builder uses, then I would be happy to have it on my house. Best of luck!
肖恩
I don't skimp on the recommended ratios, but like Akos said, the prescriptive ratios are for using painted drywall as the only interior vapor retarder. If someone knowledgeable has done a hygrothermal analysis, I would be comfortable with the proposed assembly. If they have not done a hygrothermal model and are going on recent experience instead, I would be concerned, as moisture problems often take ten years or more to present themselves.
I also agree with Akos on Zip R-12; it requires a special nailer that can shoot 4" nails, but I've heard from multiple sources that it's hard to get the depth correct. As a result, although I like the concept of Zip-R, when I design exterior insulation in zone 6 I use conventional sheathing (usually Zip) and at least 2" of polyiso.
肖恩(Shawn),泡沫本身并不是蒸气,但蒸汽比OSB略微开放,据Atlas说。面孔开放。
在寒冷的天气中减少的R值很重要,但不如您想像的那么多,因为在像您这样的组装中,只有泡沫的外半部分受到了显着影响,并且组件应该能够处理少量的润湿。但是,您拥有的外部绝缘材料/R值越多,您的组件就会更安全。
迈克尔,
感谢您提供的信息,我以前曾阅读过带有泡沫的表格给出2个浓度额定值。我相信这是来自休伯的。但是我相信你是正确的。
肖恩
肖恩(Shawn),其中有1英寸的Polyiso使用1-1.5 perms的测试,因此2个perms是2英寸材料的合理估计。蒸气打开通常被认为超过10个烫发。
I'm a bit surprised by that / not sure I understand.
如果polyiso的1“ 〜1 pers,那么多丽莎的2英寸不小于〜1 pers?
哈哈,是的,这是一个愚蠢的数学错误。将厚度加倍并不能使浓度额定值减半,但这大致正确。
迈克尔,
您是正确的,根据product-data-sheet-r-r-sheawing-sheawing-zip-system.pdf,泡沫的倍数小于1。感谢
肖恩
感谢所有评论。实际上非常令人放心,这非常有帮助。
这是关于使用Intello产品这样的智能蒸气阻滞剂,使我的内部/外部绝缘率更加宽容。谢谢!
继续沿着这种静脉,我认为我听到的是从玻璃纤维转变为具有更好潮湿缓冲能力的室内隔热材料,也是一个有益的升级(在“腰带和吊带”中,对多层降低风险降低的感觉)?
您可能会在GBA上找到有关双螺柱墙的一些文章,令人放心://m.etiketa4.com/article/the-mythical-thichical-theat-to-double-stud-walls
就护套而言,就基本组件而言,zip-r壁与双螺柱壁没有什么不同:
内部的
- 石膏
- II类蒸气阻滞剂
- 一束绝缘
- 护套
- WRB
- 排气雨缘
- 壁板
外部的
如果双螺柱墙可以在您的气候区域工作,那么类似详细的ZIP-R墙也可能会正常工作。
关于绝缘材料,许多文章推测纤维素绝缘的湿润缓冲特性有帮助,尽管我不知道这已经被证明。
Hempwool是一个在街上的新孩子。可能很棒,也许不是。这些规格看起来不错,它主要是有机产品。但是它的性能可能类似于纤维素,这要容易得多。负净碳成本也可能相似。我认为最大的区别可能是它必须运送到您多远。如果您喜欢Hempwool的想法,请继续尝试一下。但是,不要打赌农场能够得到它。如果选择是选择的绝缘,纤维素将是一个很好的备用计划。从环境的角度来看,两者都比FG更好。 both probably have similar hygric buffering behavior. Not sure what hempwool uses to make it bug/mold/fire resistant - not much info on that on their website. In fact, I don't see much in the way of code compliance test data on their site at all. You might need special permission (and a Professional's sign-off) to use it on your project.
您如何将阁楼与条件生活区分开?
我听说Joe Lstiburek说“祝您好运与zip-r获得适当的剪切评级”。有什么对话吗?
斯科特,
//m.etiketa4.com/article/working-with-with-zip-system-r-heathing