在基底混凝土板下进行绝缘。
用户1093260| Posted inEnergy Efficiency and Durabilityon
我正在缅因州南部建造一个节能房屋。我计划在木制框架棒建筑物中使用ICF和喷雾泡沫绝缘材料。在地下室板下安装泡沫聚苯乙烯绝缘材料会很有效吗？
GBA细节库
A collection of one thousand construction details organized by climate and house part
搜索和下载施工详细信息
Replies
Dana,
In your climate zone, I would strongly recommend that you install at least 2 inches of rigid foam (XPS or high-density EPS) under your basement slab.
有两个原因：
1. The insulation will lower your energy bills.
2.隔热材料将使您的平板保持暖和，从而使夏季在平板上形成冷凝水的可能性较小。温暖的平板意味着一个更舒适（和烘干机）地下室，如果您愿意，您可以更轻松地安装地毯。
“成本效益”很难确定，因为有很多变量（包括您用来加热房屋的燃料，以及将来的能源价格上涨。）在这种情况下，不必担心成本效益 -- 只需安装泡沫即可。毕竟，如果您改变主意，稍后将很难进行改造。
Martin is correct under slab insulation is crucial. How thick really depends on what your goal is, which some energy modeling will give you the answer.
虽然有几个评论/问题。据说XPS具有更大的温室潜力，因此，如果这是您的问题之一，则可能需要与EP一起使用。EPS还具有很高的体现能量，但我还没有找到一种具有成本效益的替代方案。泡沫玻璃是某种东西，但大约2倍。
马丁,我读过关于钻机矛盾的看法id foam losing R-value as it absorbs water? I've read arguments on behalf of XPS and EPS on this matter. I am leaning more toward EPS absorbing less water and loose less r-value. Interested in your take on this.
Martin also mention moisture. Your vapor barrier under the slab is very important too. I think conventional homes use a 6 mil. We used a 20 mil Stago wrap. May be overkill but it sure is tough stuff.
I think these things that go into the ground that cannot really be changed once it is done is important to think hard on. Good luck!
另外，我认为您会发现泡沫令人惊讶的价格便宜。
罗杰，
Neither XPS nor high-density Type IX EPS absorb much water, nor is either type of insulation negatively affected by damp conditions. That's why they are used below grade.
无论如何，您都希望将刚性的泡沫安装在一层碎石上，该石材充当毛细管断裂，碎石应由导致日光，遥远的干井或污泥的穿孔管道排干。如果这样做，泡沫将保持干燥。
Hi Martin,
You are right, installing crush stone and proper drainage should provide the capillary break and drainage to take care of this issue. Here's where I read about the battle of the foams.
http://www.plastifab.com/technicallibrary/docs/pibs/PIB_268_-_EPS_Insulation_R-Value_Retention_After_15-Year_Below-Grade_Service.pdf
我知道这是由一家EPS公司发行的，实际上我向测试公司留言了一条消息，以跟踪实际报告。我只是好奇。
Would you recommend using foam board under basement floor in Alabama?
威廉，
In Alabama, I would say you probably don't need rigid foam under a basement slab.
Do any Southern builders care to comment?
I live in NJ. We're adding a 520 sq ft addition with a full basement. I've told my contractor that I want 2" XPS foam under the slab, but he's trying to discourage me. He's telling me that they've seen a lot more cracks develop in slabs that have XPS underneath. They just want to put a 6 mil poly vapor barrier underneath over 4" of crushed stone.
Does he have a legitimate concern, or should I insist on the XPS? If we go with the XPS, should we still have the vapor barrier and are there specific techniques that need to be followed to minimize cracking?
埃里克，
In New Jersey, I would definitely recommend rigid foam under your basement slab. If your contractor doesn't know how to place concrete over rigid foam, it's probably time to find a new contractor. Your contractor is ignorant and possibly unskilled if he says that he can't install a quality slab over rigid foam.
确保将聚乙烯放在刚性泡沫的顶部（直接在混凝土下）。您的承包商需要比他习惯的更长的时间来完成平板，因为泡沫和poly会防止水分向下芯片。这会延迟固化，但是，只要承包商不浇水他的混凝土并在现场停留足够长的时间才能完成它，那该混凝土就会很强。他不应该着急。
感谢您的回应马丁。还有两个问题：
即使板被绑在非绝缘板上，我仍然会看到一个好处吗？（这是一个补充）。
Should we be specifying anything special about the concrete mix for the pour?
很抱歉复兴一个旧帖子，但是这里有一些重要的信息。我已经在Buildingscience.com上阅读了Joseph Lstiburek的文章，他从来没有将我们插入我们的泡沫下，否则我们只将水分含量为永恒。（请参阅第5段http://www.buildingscience.com/docum...059-slab-happy).
但是，如果我们将聚乙烯层放在泡沫上，那么我们如何解决保湿热线的问题？大多数安装人员将辐射热管贴在泡沫上，但是现在我们只在多个孔中放了数千个孔，使其有点没用，您不认为吗？
我已经读过，如果在哪里使用聚乙烯来控制蒸气，那么这些渗透物可能不会带来真正的问题，因为大多数蒸气用空气移动，混凝土是空气屏障。但是，如果我们使用聚乙烯来控制ra，我还读到，任何穿透都会抵消多乙烯的效用。
所以，告诉我，您将聚乙烯层放在哪里？解决这一困境的解决方案是什么？将PEX固定到钢筋上，然后倒在Poly（位于泡沫上）？还是湿XPS并不是那么糟糕？