如何调节现有的爬网空间？
Hi. I haven’t been here for a while because I thought I had found the solution to my crawlspace problem but alas I haven’t. I had been dehumidifying the crawlspace at our beach house with a high capacity Santa Fe dehumidifier which unfortunately got destroyed when the crawlspace was flooded during Superstorm Sandy. Rather that buy a new one, I had a vapor barrier installed, replaced the open vents with insulated smart vents and had the underfloor of the house covered in 2-3″ of closed cell spray foam.
Now that the weather is hot and humid again, the crawl space smells horrible (like cat urine which is probably some kind of hydrolysis product from the spray foam….there are no cats down there!). Even though the duct work to the HVAC system is embedded in the foam, the smell does manage to enter the house is some places. Not only is that unpleasant, but having such a humid crawlspace just seems like a bad idea. So what I’d like to know is how best to remedy the situation. I could
1. Install an exhaust fan that pulls make up air from the house; downside fan has to run 24/7
2.用圣达菲的团结和泵再次除湿空间；下行除湿机运行很多！
3. Create a new HVAC zone and heat and cool the space. I don’t want to mix air between the house and the crawlspace so it would need it’s own unit; most expensive option
我已经在绝缘材料上花费了一个捆绑包，并且想尽可能廉价地纠正问题，但是我想正确地做到这一点。任何建议都会非常感谢。我谈论的大多数爬网空间和HVAC人都不了解建筑科学。谢谢！
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由气候和房屋部分组织的一千个建筑细节的集合
答复
谢丽尔·安（Cheryl Ann），
您真的不希望您的爬网空间有任何通风孔 - 甚至所谓的“智能”通风口。要了解有关您需要采取的步骤的更多信息，请先阅读本文：Building an Unvented Crawl Space.
I think Martin's advice is really good and is the usual answer to a damp crawlspace in humid southern locations. The smell of cat urine from the foam, if that is what it is, complicates things. To have a sealed crawl space requires a space that has conditioned air by code. This is usually done with some sort of connection to house air so that the house and crawl space act as one dry conditioned space.
但是，如果气味来自泡沫，而不是潮湿，那使事情变得复杂。您当然不希望直接来自爬行空间的气味。另一方面，如果它简单地从那里的潮湿起源，那么在初始干燥后，它在调节空间组合后应该消失。
I hope the smell is coming from dampness because otherwise it becomes a complicated problem that I'm not sure there would be an easy (read cheap) solution to.
Thank you Martin and Eric. Yes, no vents would be ideal and I have read that article very carefully however this is a beach house in a town that requires storm vents. We are not allowed to have a totally sealed crawlspace. And Eric, you may be right that the dampness alone is causing the smell. We had the same problem with the fiberglass insulation before we foamed and I had assumed it was hydrolysis of the glue. In any case, dehumidification took care of the smell back then.
So, recognizing that I can't totally seal the space (the smart vents are solid not louvered and they are insulated), and I don't want to mix the air between the crawlspace and the living space what do you think my options are? Thanks again!
谢丽尔·安（Cheryl Ann），
如我的文章所述，遵循“选项1”：
“选项1要求“每50平方英尺的爬网空间面积等于1 cfm的速度连续操作机械排气通风”。换句话说，在爬行空间中安装排气风扇，该排气风扇通过轮辋托梁或外墙的孔吹来；确保风扇不太强大。楼上的房屋；由于这种条件的空气比室外空气干燥，因此不会导致凝结问题。）
Not that it's important, but I concur with Martin as long as you're sure it's only a dampness problem and not a result of an incorrect installation of the foam. (It happens, though rarely)
谢谢，马丁。那就是我倾向于的。由于泡沫，我可能不得不在地板上切一个洞以弥补空气，但我有几个地方可行。
I have leaned so much from this website and Building Science it makes me want to build a new house just to do it the right way!!! All this retro work is tedious and expensive! I don't understand why more builders don't educate themselves and build sounder, greener homes.