气候区5的地下室壁绝缘
Hello,
I am hoping someone can help me determine the correct way to insulate my basement. After reading many forums, completing a lot of research, and even contacting the builder of my home I am confused more than ever.
我位于伊利诺伊州中部5号区。地下室的正面完全低于坡度，并浇注混凝土粉底。地下室的背面有日光窗户，并在3'脚粉底墙的顶部具有标准的2×6框架。2×6的框架目前在内部填充了未取消的玻璃纤维和聚。该房屋被购买了新房屋，并于2011年末建造。
I contacted the builder and verified that the foundation is not insulated; however he did say they used a vapor barrier on the exterior of the foundation walls. He advised me that when they finish basements in homes almost exactly like mine they do not use foam on the concrete, frame 2×4 walls in front of the concrete and fill them with fiberglass but do not allow the fg to contact the concrete. The explanation for no foam on the concrete was to prevent moisture from getting trapped between the foam and the concrete which could cause mold issues. This advice seems to go against everything I have read so far.
我的基于大量研究的计划是使用2英寸的EPS或XPS粘附到混凝土上并继续进入盒子窗台，密封所有接缝，将2×4的墙壁固定到泡沫上，在螺柱上加上FG或Roxul，没有poly，并用1/2的干墙完成。
Is it the general consensus to use this approach rather than my builders suggestion?
Can I use regular 2” EPS instead of 2” XPS? The EPS is going for $10/sheet vs. $25/sheet for XPS at the local big box store. I’ve read that EPS is actually more environmentally friendly and will not lose R-Value as opposed to XPS, but is that all EPS? Are there different types? The cost savings of EPS over the XPS seems like a no brainer to me to use EPS. The guy at the box store even questioned my approach with using EPS and suggested ‘the pink stuff’ (XPS).
As for the above grade section of the basement I plan on removing the fg and poly. Filling those stud bays with the 2” EPS foam sprayed around the edges, puting the fg back in front of the EPS, no poly, and same 1/2 drywall. Does this sound correct? If I frame the wall in front of the short foundation wall all the way up to the ceiling to avoid the ‘ledge’ on the wall how should I fill the void created between the 2×6 framing and the framed 2×4 wall from floor to ceiling? The edge on top of the short foundation wall is about 4 inches.
抱歉，有很多问题。我刚刚撞上了这堵墙（双关语），真的想正确地开始建造。
Thanks in advance for any help.
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答复
Arthur,
First of all, if you haven't seen it yet, I suggest that you read this article:How to Insulate a Basement Wall。
Q。“我的计划基于许多研究是使用2。EPS or XPS adhered to the concrete and continued into the box sills, seal all seams, frame a 2x4 wall tight to the foam, add fiberglass or Roxul in the stud bays, no poly, and finish with 1/2 in. drywall. Is it the general consensus to use this approach?"
A. Yes, although the layer of fiberglass or Roxul is optional. Some people use 100% rigid foam and leave the stud bays empty (my preferred approach).
问：“我可以使用常规2英寸EP而不是2英寸XPS吗？”
答：是的。
Q。"I've read that EPS is actually more environmentally friendly and will not lose R-Value as opposed to XPS, but is that all EPS?"
A. Yes, it's all EPS.
Q。"Are there different types?"
答：是的。有关此问题的更多信息，请参阅Choosing Rigid Foam。
Q。"As for the above-grade section of the basement, I plan on removing the fiberglass and poly. Filling those stud bays with the 2 in. EPS foam sprayed around the edges, putting the fiberglass back in front of the EPS, no poly, and same 1/2 in. drywall. Does this sound correct?"
一个可以起作用的。这是剪切方法的变体。有关更多信息，请参阅Cut-and-Cobble Insulation。
问：“如果我将墙壁整个墙壁一直到天花板一直到天花板上，以避开墙壁上的'壁架，我应该如何填充2x6框架和从地板上框架的2x4墙之间产生的空隙天花板？”
A. You can fill the void with fiberglass or mineral wool batts, as long as you pay attention to the ratio between the R-value of the rigid foam layer (the cut-and-cobble layer) and the fluffy insulation layer. For more information on this issue, seeCombining Exterior Rigid Foam With Fluffy Insulation。
感谢您的快速回复。
I had read the insulating a basement article, which is what I was basing my approach off of. I guess I got confused after my builder's advice and mostly about EPS vs. XPS. I thought possibly the EPS at my local box store might be the wrong type. The difference in price between XPS and EPS makes me wonder why anyone would use XPS.
I'll need to add the fg/roxul to obtain at least R-15. Is 2'' thick EPS the minimum I should use? I wouldn't be better off with say for example 1'' XPS which is around same price as 2'' EPS would I?
Is the builders caution about moisture between the cement and foam a concern?
再次感谢你你的反应。
Arthur,
Q。”是2-inch-thick EPS the minimum I should use? I wouldn't be better off with say for example 1-inch XPS, which is around same price as 2-inch EPS, would I?"
A. A conservative approach is to follow the guidelines in this article:Calculating the Minimum Thickness of Rigid Foam Sheathing。If you live in Climate Zone 5, and you plan to install a 2x4 wall on the interior side of the rigid foam, then the rigid foam layer needs to have a minimum R-value of R-5. You can do that with EPS that is at least 1.5 inch thick, or with XPS that is at least 1 inch thick.
As I wrote in my first response, thicker fluffy insulation requires thicker rigid foam. The ratios are explained in the article titledCombining Exterior Rigid Foam With Fluffy Insulation。
问：“建筑商对水泥和泡沫之间的水分的谨慎是否值得关注？”
A. The answer can be found in another article that I urged you to read,How to Insulate a Basement Wall。The basic story is that you can't add insulation to a concrete wall until you are sure that the wall is dry enough to proceed. In my article, I wrote:
"If you want to insulate an existing basement, you’ll probably be working from the interior. Before installing a layer of foam insulation on an existing wall, the first step is to verify that the basement wall doesn’t have a water-entry problem.
“诊断和解决现有地下室的水上问题本身就是一个大主题，并且超出了本文的范围。就可以说，如果您的地下室墙每年春季或每次下雨都会潮湿，在解决水上问题之前，不应绝缘墙。
“在解决这个问题的可能解决方案中：
调整房屋周围的坡度，使土壤在所有四个侧面都从建筑物上倾斜；
安装连接到导体管的屋顶水槽，这些管道将屋顶水从粉底传递出来；
Excavating the exterior of your foundation and installing new footing drains leading to daylight;
在地下室的周围安装内部法国排水管，并将排水管连接到装有污水泵的水箱；和
Installing a layer of dimple mat against the basement walls before insulating.
“有关这些问题的更多信息，请参阅固定湿地下室。"
In the article mentioned at the end of this section (固定湿地下室), I provide the following advice:
“也许您已经准备好将地下室墙壁隔离，但是您不确定它们是否足够干燥以至于您可以继续进行测试吗？
"The traditional test is simple: tape a piece of polyethylene measuring about 12 inches square to your concrete wall or concrete slab. (If you’re testing your walls, it’s good to test them in multiple locations.) After 24 hours, if you see water drops under the plastic, that indicates that your walls are too wet to insulate. If you see water drops on the interior side of the plastic, it means that your indoor air is humid, and the concrete is cold. (Fortunately, that problem won’t prevent you from insulating. After all, a layer of rigid foam will eliminate the cold surface. And the high indoor humidity can be addressed by air sealing your home’s thermal envelope, or — in a pinch — with a dehumidifier.)"
一些评论：
*If the sill gasket between the top of the foundation and the 2x6 studwall is something better than the cheap foamy stuff the concrete doesn't need to dry toward the interior.
*如果粉底的高度暴露在其上没有水分屏障，则低于级别的部分不需要向内部干燥。
*如果立足是干燥的，或者立足和茎墙之间存在毛细管断裂，则基础不需要朝内部干燥。
If I had to guess, I'd hazard that the sill gasket is a cheap foamy, there is no capillary break between the footing and stemwall, but that there is sufficient exterior exposure on the concrete that it will stay dry enough to protect the foundation sill, even with foil-faced foam on the interior face of the foundation.
Assuming there isn't an adequate capillary break at the foundation sill, such as an EPDM sill gasket, and you're still concerned about keeping it drier, use only UNFACED foam on the foundation (or at worst fiber-faced roofing polyiso) which would lower the average moisture level at the foundation sill relative to foam with true vapor barrier type facers.
即使从标记的R角度来看，XPS中的1英寸就足够了，从长期性能的角度来看，它实际上是R4.2/英寸，而不是R5。
Cheaper than box-store foam, try digging up some reclaimed roofing foam. eg: These folks in St. Louis are sitting on 26 sheets of used 3.5" fiber faced polyiso for $25/sheet (which is on the high side for used-foam- 3.5" reclaimed polyiso regularly trades for under $20/sheet in my neighborhood, often under $15/sheet), enough to do 100 linear feet of foundation perimeter 8' high.
http://stlouis.craigslist.org/mat/5718259366.html
Even derated to R5/inch that would meet code, and it could be held in place with 1x strapping through-screwed to the foundation with masonry screws, and you wouldn't incur the expense of an insulated studwall. Even with the furring it would only take up 4.25" of space between the drywall & foundation, which is thinner than a moisture-safe foam + insulated studwall solution.
如果您有时间等待合适的交易，这些交易会定期出现。当前没有Peoria或Springfield Craigslist页面中列出的任何内容。如果它是最关键的全国范围内foam.com有中西部仓库，并且可能会引用您在即时库存 +运送到您网站中的任何东西，通常用于储物柜的价格井（通常约占泡沫零售价25％，以及运输运输）。
如果polyiso，将泡沫的切割底部边缘和平板的切割底部边缘（或留下1/2“气隙）作为毛细管断裂，以防止平板中存在的任何地面水分从芯上进入泡沫。