另一个看绝缘混凝土形式的时间?

cc by 2.0。绝缘混凝土形式/ Lloyd改变细节

他们有优秀的美德,但混凝土和石化三明治不应该在绿色建筑菜单上。

Insulated Concrete Forms are a clever building system where two slabs of insulating foam are separated by plastic ties; you just stack them up, throw in some reinforcing bars if required, and fill with concrete. It makes a very energy efficient wall, the formwork is the insulation, and they are terrific in hurricane and tornado country. Many people consider them to be "green" because they provide such an energy efficient and durable wall.

能源效率是一件美妙的事情,但读者抱怨ICFS是聚苯乙烯和混凝土三明治,两种材料,我并非特别喜欢。典型的评论是,“Apparently this d-bag has no idea what an ICF house is like in real life. Typical academic with no real world experience. Nice unimformed [sic] theories.“鉴于ICFS有他们的位置(他们制造得很大),我已经在这个主题上奠定了很多年。

现在,写下Inpassive House Plus,John Cradden在Passivhaus建筑中看了ICFS的使用。有很多东西可以喜欢:

ICF当然是找到energ拥护y-conscious architects and designers thanks to certain advantages that enhance its thermal performance, including inherent airtightness, the virtual elimination of thermal bridging and the fact that its advertised U-values are reliably achieved.

Cradden确实写了一段记录一些警告。

While ICF certainly has its advocates, others may baulk at the fact that it typically comprises two materials which can have comparatively high environmental impacts: ready-mixed concrete and polystyrene. Both materials have relatively high embodied carbon emissions, although the question of how green ICF is may need to be based on a systematic sustainability assessment of the whole construction. Such an assessment could determine the embodied CO2 of a material, among other parameters, including a full life cycle analysis.
比较LCA中的两个墙壁

将苹果与自行车进行比较在生命周期分析/屏幕捕获中

There are a few life cycle analyses that have been done, and they do show ICFs favourably. But asI noted in my review of one a few years ago,他们没有将苹果与节能墙上的苹果进行比较;我抱怨说它甚至涂抹橙子,而是涂有苹果到自行车,将2x4螺柱墙与玻璃纤维进行比较到12英寸的ICF。猜测哪个将在其寿命上挽救更多能量?

Embodied energy and Life Cycle Analysis

被动房子墙壁

劳埃德改变了/ Steico wall/CC BY 2.0

我怀疑,如果一个LCA对比较现代木材和纤维素的宽容墙到一个相同的ICF墙壁的ICF墙壁,那么一个人会得到一个非常不同的答案。采取制造产品所需的体现能量和碳;我读到的LCA研究说,“超过90%的生命周期碳排放是由于运行阶段,建筑和寿命结束处置占总排放量的不到10%。”

John Ochsendorf/MIT" data-caption="" data-expand="300" id="mntl-sc-block-image_1-0-25" data-tracking-container="true">
信用:John Ochsendorf/MIT

©John Ochsendorf/MIT

That just isn't true in Passivhaus designs. When insulation levels get really high, embodied energy of the materials becomes much more significant a factor than it used to be with less efficient walls, where operating energy dominated.

Health and toxicity

建立展示

©建立展示

Then there are health questions. I know things are changing in Europe, but most foam plastics are treated with flame retardants (although the terrible one, HBCD, has been discontinued). They are petrochemicals, essentially solid fossil fuels. There are so many environmental issues with them, and it's not like there aren't alternatives that don't have these problems.

甚至没有让我始于混凝土,由责任的水泥制成5 percent of the world's CO2 emissions,和聚集物responsible for habitat destruction around the world.I take the position thatif you don't need it, don't use it.

There are also a few ICFs that try to address the issues.杜丽苏尔是北美之一和velox看起来像一个类似的产品,由英国的木屑制成。它们都是混凝土填充,但避免泡沫。

Recyclability

John Cradden还提出了循环性问题:

通常用于制造ICF - EPS,混凝土,塑料领带和钢钢筋的材料 - 一旦建筑物达到生命结束,这是爱尔兰公司AMVIC的一个重要因素,即爱尔兰公司AMVIC的一个重要因素它的系统。

I would argue this. It is as recyclable as a Nespresso or Keurig pod; you can do it, the companies pretend to do it, but it is what Bill McDonough calls a "monstrous hybrid" -- far more trouble than it's worth and just phoney feel-good environmentalism done for show and to assuage guilt. Nobody is going to take these sandwiches apart.

基础

Lloyd Alter / Foundation部分/CC BY 2.0

I am not going to be as doctrinaire as I was a decade ago; ICFs have their place. I have seensystems like Legalett's在你忍不住欣赏完全,无缝包装绝缘层的优雅的地方。当他说ICF快速而整齐地上升时,我无法与克拉登争论,并制作一个持续很长时间的耐用墙。他明确表示ICFS有很多优点。

Elrond推文

由Elrond Burrell /屏幕捕获推文

但我仍然相信,无论何处有替代,我们都不应该在绿色建筑中使用混凝土或石化。克拉登指出“被动房屋设计师在施工类型时通常是不可知的,因为重点主要是节能。”我认为这不够好;这就是为什么我有,舌头只有脸颊,提出the Elrond Standard:Passivhaus +低体现能量+无毒。

And that means concrete and foam sandwiches shouldn't be on the menu.