Rigid Foam on the interior face?

jnarchitects|发布能源效率和耐用性在2012年2月2日上午10:56

嗨

我正在为一个新房子的计划工作，并一直在寻找两个选项的外墙组装。气候5区，沿海，夏季非常潮湿。可能是强制空气加热和中央空调冷却。

寻找约。R-40墙壁。

我倾向于一个双2×4螺柱墙充满了纤维素。比起喷雾泡沫和硬质泡沫，我更喜欢纤维素对环境的好处。似乎在窗户/门上的细节/闪光等，双柱墙比外部的硬质泡沫更容易。

然而，我谈到设计的第一个GC注意到，在我们的地区劳动力成本相对较高，在整个周边建筑双柱墙的想法将是非常高的。他建议在内部使用硬质泡沫(3/4″-1″)，然后使用全腔纤维素或喷雾泡沫。I haven’t read much about interior rigid.I would be a bit nervous about the drying potential to the interior particularly on a house with forced air cooling.Certainly, the construction details would be relatively straightforward.

我得补充一句，这房子的占地面积并不理想。它是一层“L”形平面，3500sf。我知道这并不理想，但是场地、项目和其他因素决定了设计。这当然会影响使用双柱墙，因为有一个大的外墙百分比，这导致在墙的厚度“损失”了很多sf。

有什么想法的内部侧刚性泡沫?

回答

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用户- 723121|2012年02月02日上午11:32|# 1

克里斯,

Interior foam is a bit of a pain for nail pops, hanging cabinets, window trim, etc.Look for a knowledgeable and progressive builder in your area that will build your house the way you want it.
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马丁Holladay|2012年02月02日12:02pm|＃2

克里斯,
用内部硬质泡沫来建造墙壁是可能的。以下是缺点(除了Doug已经提到的):

1.With interior rigid foam, rim joists and partition intersections aren't as well insulated as with exterior rigid foam.

2.在炎热，潮湿的气候，外部刚性泡沫给你额外的保护，以防止向内太阳能蒸汽驱动。
jnarchitects|2012年02月02日12:22pm|# 3

马丁,
You mention the advantages of exterior foam in a hot, humid climate, but any vapor concerns with interior foam in Zone 5?

The disadvantages don't seem as significant as I thought they might.Trim install with exterior rigid is not particularly easy and the rim joist issue seems to be the same as with a double stud wall.

It does seem like air sealing could be more difficult with interior foam, but maybe no different than a double wall.

我想双层墙和内部刚性的最大缺点是你不能像使用外部泡沫那样保持护套和框架的温暖。

困难的决定，因为外表面积的数量.....

再次感谢你提供的信息。
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马丁Holladay|2012年02月02日下午01:04|# 4

克里斯,
No real vapor concerns.
jklingel|2012年02月02日下午03:00|# 5

我听到了关于双柱墙的“额外成本”的争论，但在我看来，在建造整个房子的大蓝图中，额外的人力用于墙是相当小的。For you professionals, how much time do you think double-studding adds, vs single-stud and exterior foam?I've only worked on a couple of houses, so my view is myopic on this.
bdrfab|Feb 02, 2012 05:23pm|# 6

取决于泡沫的厚度。只有1”吗?没有贴条?2"和毛皮条?两层泡沫?我有过在我的房子上放两层泡沫的经验，但没有双柱墙的经验。泡沫花了我相当长的时间，尽管在大多数情况下，在黑暗中工作，没有帮助。也没有裁掉几乎每一张纸。一般来说，框架部分是快速和简单的。我预计它会比单层泡沫带皮条和金属t型支撑略贵一些。 House shape/geometry would make a huge difference as well. But I'm thinking I would side with the OP on this, in new construction it would be easier to do the double stud wall, flashing and what not, with better insulation levels. A while back there was an article on a passive house built in Maine with I joists on the outside as insulation bays, built for $130/sf. Around here that is about the cost of a starter, builder level tract house. I'd guess the shell is typically 15-20% or so of the cost of the house, not including windows.
jklingel|Feb 02, 2012 05:45pm|# 7

亚伦:同意。我只是不认为增加另一堵墙的时机，以及它的细微差别，像一些人引导人们相信的那样极端。我怀疑这和建造者的不熟悉程度一样，也和花费有关。不过，我还是想听听那些同时做过这两件事的人是怎么想的。你在窗户、装饰、楼梯等上花了那么多时间，我觉得第二堵墙没什么大不了的。但是，我想知道。
用户- 723121|Feb 02, 2012 08:04pm|# 8

约翰,

Some of your questions might be answered by the NREL Net Zero Habitat For Humanity house.

http://www.nrel.gov/buildings/pdfs/43188.pdf
dankolbert|2012年02月02日08:51pm|# 9

We've built several houses with double stud walls.In fact, I wrote a piece on one project for JLC a few years ago.It's easy, goes up fast, allows for flexibility, and avoids foam, which I think is always a goal worth pursuing in new construction.

我想说，第二堵墙的成本低于泡沫的材料和劳动力，它的安装，所需的毛皮，以及电气、干墙、装饰等增加的难度。
jklingel|2012年02月03日12:40|# 10

Doug: I scanned that article, and did not quite see what I was looking for.It was an interesting read anyway;the walls are quite similar to my house.丹:好吧。Especially if one has a Larsen/Riversong-type 2nd wall, there really is not a lot to it.The numbers I ran for my area we very much in favor of the double stud set up, ignoring labor costs, which is the big unknown to me.I don't get paid either way, and hope I run into someone who builds/built both ways and has some hard numbers.谢谢。
wjrobinson|2012年02月03日09:54|# 11

Repetition makes almost any build way faster and hence lowers the labor cost.I explain to local carpenters how in California, 500 home tracts, go up at the speed they do one home and they just can't picture it.
用户- 755799|2012年02月03日上午10:24|# 12

I have built both ways a number of times and definitely prefer double stud to exterior foam.While the foam may seem quicker, the detailing becomes the time lag.Also, I would read this before going the exterior route (3/4" may be to thin even with polyiso):

//m.etiketa4.com/blogs/dept/musings/calculating-minimum-thickness-rigid-foam-sheathing

此外，在外部使用硬质泡沫，在内部喷洒泡沫，形成可怕的“泡沫三明治”。这也将是一个比双墙建设更昂贵的路线。