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Building Wall

G m|Posted inGreen Building Techniqueson

I received quite a bit of information on my last question and I thank all of you for that. Another question I have concerns putting a 1/2″ EPS or XPS rigid sheet on the inside of the wall, then 1/2″ drywall. It may be overkill, and that is why I’m asking. This would be in addition to 7″ of cellulose in the 16″ OC bays, 1/2″ CDX, 2″ XPS, 3/4″ furring strips 16″OC and then cedar clapboard. Crazy thought?

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答复

  1. Aj Builder, Upstate NY Zone 6a||#1

    GM,如果您愿意或螺柱上的泡沫条,请添加水平内部绑带。请勿添加分离的泡沫层。这只是一个坏主意。这可能是可以的,也可能是一场灾难。

    为什么?这是我曾经使用的例子。取一个Ziplock bag, close it with some insulation in it. poke a few tiny holes in it. That is your wall. Now sit the bag on a plate and add a bit of water to the situation. What you'll get if your test is like mine, is water in the bag and wet insulation. Next take the bag off the plate and see how long it takes for the water to dry out of the inside of the bag. Forever! Not good. Structures always leak. Build structures that have only one tough plane to penetrate. Then whatever gets in moisture-wise can have half a chance at exiting.

  2. GBA编辑
    马丁·霍拉迪(Martin Holladay)||#2

    GM,
    如果AJ的答案不清楚 - 我在那里有点迷路了 - 您应该在墙上只包含一层泡沫。您不想在两层泡沫之间将木制组件夹在木制之间。

    我很确定这是您上次问的我回答的,我的答案保持不变。

  3. 理查德·克拉克(Richard Clark)||#3

    为什么有些建筑商在护套上放置空气屏障,而另一个则在内部蒸气屏障上放置空气屏障?

  4. G m||#4

    Actually, you did mention it but I guess it did not sink in...sorry. And I believe the consensus here is that adding the XPS is best on the outside of the wall...correct? Anything wrong with using say a 1" XPS on the inside (covered with drywall), dense-packed cellulose in the bays and just CDX, house wrap and siding on the outside? My guess is that it will eliminate thermal bridging, save on the XPS costs (1" vs 2") and save considerable money on the windows and doors that will need alterations with the exterior 2" XPS. Just trying to understand the best solution for efficiency and costs...

  5. Aj Builder, Upstate NY Zone 6a||#5

    GM,it is done all the time.

  6. GBA编辑
    马丁·霍拉迪(Martin Holladay)||#6

    理查德,
    问:“那么为什么有些建筑商在护套上放置了空气屏障,而另一个建筑商在内部蒸气屏障?”

    答:两个空气障碍没有错 - 只是两个蒸气屏障。

  7. GBA编辑
    马丁·霍拉迪(Martin Holladay)||#7

    GM,
    内部泡沫或外部泡沫都可以工作。外部泡沫的优点是它解决了分区交叉口和边缘托梁处的热桥。内部泡沫不这样做。

  8. G m||#8

    我不确定我明白。我的内部场景是否像外面那样好吗?如果不是,那为什么呢?抱歉,如果我错过了这艘船,但我真的不想在这个建筑物上犯任何错误...在我这个年龄,我相信这将是我居住的最后一所房子。

  9. G m||#9

    抱歉,马丁...我在打字,没有看到您的回答。谢谢你...

  10. GBA编辑
    马丁·霍拉迪(Martin Holladay)||#10

    GM,
    It's not as good, for two reasons:
    1.您选择的内部泡沫只有一半的厚度(因此是R值一半)作为您打算使用的外部泡沫。

    2.正如我在上一篇文章中所写的那样,外部泡沫解决了分区交叉口和边缘托梁的热桥;内部泡沫不这样做。

  11. Aj Builder, Upstate NY Zone 6a||#11

    只是为了真正增加混乱,当最好的外部泡沫隔热专家完成工作时,他们会在两层中使用箔纸面对的泡沫,每一层小心地安装并用优质的胶带将其粘在接缝处。有些甚至填补了第一个泡沫层,因为它位于护套上以阻止任何空气运动。有些人会将床单放置,然后将试图“粘合”在一起的差距喷涂。

    Foam sheathing is no good if any air can move around it. A tiny space can make a huge section of the insulation meaningless. I am friends with two contractors that have used insulation like this for decades and they really give it their all to detail the install as perfect as possible. They even buy one foam company over another just because the sheets come more exact in size so as they can fit them as tight together as humanly possible.

  12. G m||#12

    谢谢大家的回答...他们帮助我决定了我的哪种方式。

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