Clean and dry
该爬网空间已密封，以防止空气泄漏和能量损失。地板上的聚乙烯板是有效的水分屏障。Image Credit: GBA
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Morgan Martin’s dilemma is what to do about the crawl space beneath the house, identified in a recent energy audit as a source of air leaks and energy loss.
The joist bays above the crawl space have been insulated with fiberglass batts, but the subflooring has not been air-sealed. A local green building company recommends removing the batts and taping and caulking all the gaps in the floor (that is, the crawl space ceiling).完成后，建造者列出了三个选项：
- 将玻璃纤维棒放回原位，没有额外的绝缘材料；
- Apply rigid polystyrene insulation, then reinstall the fiberglass batts; or
- Forget the fiberglass and spray BASF Spraytite closed-cell foam on the underside of the floor sheathing.
There are two complications: “Please know before I go on that I have chemical sensitivity issues,” Morgan Martin writes in thisGreenBuildingAdvisor的问答帖子，“这就是为什么这个决定对我来说是如此重要的原因。”
There’s also a concern about rats. The crawl space had been infested with them, and while it’s since been cleaned and sealed, Morgan questions whether the polyethylene sheeting that covers the dirt floor will be enough to keep them out in the future, and that may affect whatever option he chooses.
But the main issue seems to be the potential health effects of polyurethane foam, discussed in a number of previous Q&A posts. “We have the option of doing a 2-in. layer of the foam and then putting the fiberglass back up over it or doing a 4.5-in. layer and not using the fiberglass at all,” Morgan says. “Even with all this reassurance it will be safe for me and my family, I have severe reservations about using the spray foam — even though the green builder…
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4 Comments
Crawl space venting & insulation details
由康涅狄格州地下室系统开发的爬网空间封装系统的“ CleanSpace”系统已获得了令人印象深刻的记录，可将潮湿，害虫感染，效率低下的爬网空间变成干净，调理性，节能，节能的区域。该系统旨在处理最坏的爬网空间情景，带有外围排水管和污水泵系统，可去除水，一个超耐用的塑料湿度屏障，以密封泥土地板，以及喷雾和刚性泡沫以隔离基础墙。甚至还有一个垫圈的PVC盖，它完全密封了爬行空间通风孔和门。值得检查是否要查看设计精良的最先进的系统。
位置对于确定绝缘放置至关重要！
我要补充一点，特别对马丁，彼得和汉森做出了反应，在寒冷的气候下，已证明将密封的绝缘爬网空间涂在基础墙上，与爬网空间天花板隔热相比，涂在基础墙上的隔热层用于加热。原因是由于裸露的爬网空间天花板到凉爽的地球大量辐射热量损失。他们发现R-30玻璃纤维棒（仍密封的爬网）与对照组（符合代码，可能是code conted，r-19的天花板）相比，节省了20％的加热能量，并节省了53％的加热能量。与基础壁上R-13连续泡沫的对照组相比。当然，如果这些R值平等，故事可能会有所不同，但是很少在爬网墙上改装R-30泡沫。这项研究是在亚利桑那州弗拉格斯塔夫进行的，爬行中有管道。当然，人们期望冷却能量使用会反应反应。这是Advanced Energy Corp进行的研究概述：http://www.advancedenergy.org/buildings/knowledge_library/crawl_spaces/pdfs/Closed%20Crawl%20Spaces.pdf
因此，这与健康/毒性的问题无关（在上述研究中，密封的爬网在水分/模具方面表现更好），但是我认为绝缘放置的选择很大程度上取决于气候/位置。在所有情况下，绝缘并密封爬网将节省能量，这根本不是真实的。
你们仍然缺少重点...
为了获得较低的能量账单和清洁烘干机的好处，您需要将地板和爬网墙隔离，并可能取决于爬行空间的地板，具体取决于您的气候区域。就我能够验证而言，我是唯一使用该系统的人，我一直在证明它的有效性已有二十年了。
马丁·霍拉迪（Martin Holladay）回应了我对他对封闭式爬网设计的回应，批评我的系统对大多数人来说太昂贵了，因为它需要在两个地方安装绝缘材料，而不仅仅是一个地方。我们在建造的每个房子上都反复完成了数学，这些房屋都有爬行空间。如果遵循我的方案，这种额外的绝缘材料会在三到五年内为自己支付。
You can download my Closed Crawlspace Calculator for free athttp://www.zero-energyplans.com。你需要调整地面温度nd typical winter outside air temperatures for you own climate zone, you may also want to make other tweaks to make it work for you, as it was only originally intended for use in the Pacific Northwest. I have tried it using data from a number of locations through zones 3-6, and it works in all of them.
In this assembly, spray foam should be reconsidered.
这对夫妇之一确实在小星球车间停下来，我们讨论了第三种选择：将巴特绝缘材料放置在适当的位置，并添加了跨越地板托梁底部的渗透性但气密的膜。
对我来说，似乎很明显的是中心问题是没有地下。地板由2x6 T＆G撞车（正如我们在太平洋西北部所说的）组成，直接在托梁上。对我来说，这意味着，如果化学敏感性在应用产品后确实会出现，那么这是一个问题，因为T＆G Deking在空气移动和偏离时确实非常开放。一旦SF产品出现...就不会删除它。成功应用化学敏感的项目的良好经验数据很棒……直到对这个客户来说是错误的。就我个人而言，我认为该楼层组装中缺乏纸张库存表明该项目采用了警告性方法。
This approach was not chosen by the client since a taped membrane from Siga, Tyvek or other is not "rat proof" and if another infestation occurs it could be difficult to inspect membrane damage. Admittedly, the air-sealing details of the perimeter would be difficult but I don't think more so than any of the other strategies offered. What it does have is no VOC's in the Siga air-sealing tapes or membranes. Nothing to off-gas and an easy inspection and service addition for future changes.
I know the builder in this case and he's quite good. If foam is used, hopefully it doesn't trigger the client.
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