Exterior Rigid Foam Under Sheathing?
Joshua Greisen|Posted inGreen Building Techniqueson
在我当地的地区，有一个绿色的建筑顾问，推荐一个基本上是EPS泡沫粘合到OSB的CI面板。安装的方式将是外部的OSB。几乎每个房子在我的在线顾客中看到外部刚性泡沫都覆盖着蓝色和粉红色的XPS，OSB护套直接钉在螺柱上，完全覆盖着刚性泡沫。这会导致我提出以下问题：
熟悉这类CI panels?
- 在这些产品中看到，将护套放在刚性泡沫的外侧有任何好处吗？
– Why does adding rigid foam on the exterior of house sheathing seem more prevalent than sheathing to the exterior?
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答复
Sheathing is normally applied directly to the studs to provide structural resistance to diagonal racking of the wall framing. A layer of ESP interposed between the studs and the OSB breaks that direct mechanical connection, so the arrangement your consultant describes would only pass inspection if a) the panel is specially engineered to provide such bracing - look up insulated structural sheathing - or b) if the framer includes alternative bracing provision such as let-in diagonals or proprietary steel bracing elements.
Google ZIP-R ZIP SYSTEM from Huber. It's slick stuff.
好处：易于建设。更少的步骤=较低的错误机会。更容易建造一个雨水屏幕，没有乱搞房屋包裹（至少用ZIP-R），只有磁带接缝一次。
The one downside is that sheets which have thicker pieces of foam (ex R12) will require additional structural bracing for the framing. So if you wanted to do a really high R-value wall it might be easier to just throw up OSB first and then attach the foam.
以下是GBA贡献者的链接，他在格鲁吉亚（CZ3）完成了他的房子，他使用了ZIP-R。
//m.etiketa4.com/blogs/dept/green-building-curmudgeon/topping-out.
约书亚，
Here is a link to a GBA article that explains everything you need to know about the type of wall panel you are talking about:墙壁的钉子面板。
Is there any code compliance issue with installing 1"xps to the studs, followed by 1/2"ply sheathing and tyvek? Wouldn't this be a cheaper alternative to huber zip r?
Martin,
Thank you for the link, that is the article I was hoping to find. I wouldn't have thought of the keywords "Nailbase Panels" though. I kept searching under CI panel.
Put the foam on the outside. Not BETWEEN the studs and OSB. You won't regret it.
乔，
Sticking with the foam to the exterior of the sheathing is the direction we are heading. Now we are digging into the details on the exterior EPS panels. Trying to figure out the most cost effective product in our area that meets our requirements. Whether the product should be faced for the walls /foundation and whether a single thick layer versus 2 overlapping thinner layers is better. Any advice in these areas?
I used 2.5 inch single layer white EPS but two overlapped layers are certainly a little better. I taped the seams with 3M all Weather tape and since I used reclaimed foam, any little gouges or voids, I added some Great Stuff I need a can. It is remarkable how much warmer the OSB is when it has the foam outside.
约书亚，
Also consider using reclaimed foam on your project. It is much less expensive than new material and is more environmentally friendly. One source is Insulation Depot or, possibly, your local Craigslist.
我是第二个史蒂夫·克纳普。我在那里的克雷斯莱斯列表中找到了一个男人。他有一个商业模式，从拆除承包商中购买泡沫，拆除东北部行业的最后一个残余物。广阔的工业仓库，冷藏仓库，大规模工厂，旧商店和纽约州和宾夕法尼亚州的这一切都被每天都放在破坏的球中，并且演示承包商明显热衷于回收和废料。他一般地买了他们离开屋顶的东西。我为我的墙壁买了非常好的两和半英寸的eps，以及我在我的混凝土附带的廊道板下使用的高密度三英寸XPS，我的房子大部分都在周边。尽管如此，它是呼叫山核桃街租赁。他甚至在萨拉托加县交付给我，最终我挽救了一半或更多。我觉得我评价r十一个左右的eps。
@Joe
Why would you not want to have the foam layer on the interior side of the sheathing? It really makes no difference.
Exterior foam is a compromise. It's more work, requires more material, more difficult to hang a rainscreen, flashing details can be more complex.
The only advantage of exterior foam is cost and the fact that you can push the R-value a little higher if you need it (most of the time you don't).
约翰，
我可以想到的两个优点。在外侧的泡沫上，护套可以向墙壁提供必要的剪切抗性，并保持护套暖。第二个问题取决于气候。
@Malcom.
Agree. Additional shear bracing may be required with thicker levels of foam. That and cost are the primary issues (R6+).
imo鞘的温暖只是在使用外部泡沫时待解决的问题。
If the sheathing is on the exterior of the foam then drying isn't a concern because interior vapor will never reach the sheathing and the sheathing will always dry to the exterior (especially with any rainscreen). IMO that's a win-win.
约翰，
我只是因为我们（也许是独特的）局面而造成的气候。在PNW外部护套随着时间的大部分宽度湿度水平的高度湿度水平，在PNW外护套随着时间的推移而受到一点损坏。外部泡沫将减轻这一点。
Thinking of using EPS 1-1/2" thick under exposed floor framing with foam insulation...then MDO plywood as finish on top of (or rather beneath) the EPS. Can plywood be nailed or screwed ok to TJI framing above without any problems, or is some type of nailer needed? Also, how would you secure the EPS to the bottom of theTJI's before adding the plywood below? Cap nails? adhesive?
我猜这是一个地下室项目的一部分，所以你计划在TJI托梁下安装一层eps，然后是胶合板，用螺钉进入TJI托梁的下部和弦？除非您需要一个可能需要一层干墙，否则我在这里没有看到问题。
I would use regular construction screws for this. I'd tack the EPS up with a few light-duty screws first, then put the plywood over the EPS using enough regular construction screws. I would stagger the sheets a little so the edges of the EPS and plywood don't line up.
请注意，您不希望渗透到Web - OSB中心 - TJI托梁。如果你挑选只有1“左右的螺丝，你就会好的。你的大部分与TJI的限制都必须用网络中的切割孔，或切割和弦（不要削减和弦）。钉或拧入和弦通常不是问题。
账单
谢谢......实际上，我们在一周前完成了这项工作......承包商在安装2 x 4后，承包商用一些PL粘合剂加上了EPS，以支持4'X8'MDO纸的所有边缘......然后是电源钉了mdo床单......出来了。