答复

1. GBA编辑
   Martin Holladay|2009年9月10日05:26 AM|＃1

   Mark,
   的墙壁空间应绝缘rigid foam insulation or spray polyurethane insulation. In some cases, it also makes sense to insulate the floor of a crawl space. In any case, a crawl space should be tightly sealed — not ventilated — and equipped with a ground cover of heavy polyethylene, EPDM, or similar material to prevent soil moisture from evaporating.
   在这里阅读更多：
   //m.etiketa4.com/green-basics/crawl-paces

2. 
   Allison A. Bailes III|2009年9月10日07:04 AM|＃2

   If advisable, encapsulating your crawl space is the way to go. This means covering the ground with a vapor barrier sealed to the walls and at all the seams, sealing up the vents in the foundation walls, doing something with the air (conditioning it directly, exhausting a small amount, or dehumidifying it), and insulating the foundation walls. The old insulation doesn't need to be removed in many houses, but it sounds like I'd recommend it for yours.

   In some cases, it's not a good idea to completely seal up the crawl space, however. What kind of furnace do you have down there? If it's an atmospheric combustion model, which uses air from around the unit for combustion, you'll need to make sure it has adequate air from outside. Otherwise you could possibly depressurize the crawl space enough to cause backdrafting, especially if there's also a gas water heater down there.

   有关此主题的信息来源是Advanced Energy的网站，http://crawlspaces.org. They did research on this topic early in this decade and have guidelines you can download for free from the site.

3. 
   丹尼·凯利|Sep 23, 2009 12:31am|＃3

   我们每天都在挣扎 - 我们在南部（NC）下，几乎每个爬网空间都有很高的水分，一些霉菌和霉味的气味。我们通常使用封闭的爬网进行新结构，但不愿在现有的爬网上使用它。如果不采取非常昂贵的措施（霉菌修复，霉菌，空气洗涤器等），似乎几乎是不可能的。通过密封/关闭爬网 - 然后与条件的房屋进行通信 - 我们当然不希望那种发霉的空气与房屋的起居区混合。

   大多数专家都认为，通风的爬网不是要走的路 - 但是我们发现了一种似乎妥协的产品。ATMOX系统http://www.atmox.comis a smart system of foundation vents that have fans. On a typical home - we install 2 intake fans, 3 exhaust fans (to keep a slight neg. pressure on the crawl) and seal up all other vents. There are sensors that measure the interior and exterior temperature and humidity - it calculates the dew point and only runs the fans when the conditions are better outside than they are inside the crawl. Once the conditions inside the crawl are improved, the fans trun off virtually sealing the crawl and not allowing hot/humid air to enter. We have been using this for 10 years to resolve houses with major mold problems - yearly inspections are performed with very good results. Much cheaper than closingthe crawl and do not run the risk of mixing contaminated air. By movingthe air - it should over time remove the musty smell - if that does not work than removing the insulation may be the only answer.

   Of course we still install a vapor barrier, proper air sealing and duct sealing. Cold air from the duct leakage combined with the hot/humid outside air is usually the main culpret with the mold growth.

4. 
   Allison A. Bailes III|Sep 23, 2009 10:39am|＃4

   丹尼，
   Crawl spaces communicate pretty darn well with the houses above them before they're encapsulated, and sealing them up doesn't necessarily make that any worse. If you follow Advanced Energy's recommendation to air seal the floor to isolate the crawl space from the house, it communicates less after encapsulation.

   在过去的5年中，我封装了很多爬网空间，房主的反馈证实，我的经验是，正确完成后，发霉的气味消失了。我不是霉菌专家，但我知道霉菌需要水分才能生长。删除它，这不再是问题了。

   如果用大量外部空气散发爬行空间为您工作，那就太好了。但是，我不信任这种方法，因为它需要在夏季大部分地区不经常存在的条件。您在北卡罗来纳州的哪一部分？

   这也取决于正确运行的控制系统，以找到露点并打开风扇打开或关闭风扇。由于该系统在爬行空间中，房主将如何知道它是否出现故障并在几个月内每天以75度的露点发出空气？

   最后，我相信正确封装的爬网空间将胜过美国东南部大部分地区机械通风的爬网空间，因为露点的距离不足以进行通风。