Insulating our crawlspace (with limitations)
Hi all. So our home was built in 1952 out in the pacific northwest – I have no exterior wall insulation, no floor insulation and a vented crawlspace. Only insulation we have is in the attic which was recently air sealed and then we had blown in cellulose which brought that up to code. For now (we have renovation plans which might remedy the exterior wall insulation issue later) we’d like to insulate the floors / crawlspace. I hate to say it but I think spray foam might be out of the question and I think encapsulating is also out of the question. Due to $$$. Curious what my options are with that or what suggestions y’all might have. Bonus if it’s DIY’able and I can tackle this myself.
爬网空间的照片
https://imgur.com/a/MMisawG
The only thing else to note here I think is that the plumbing is under the house but I think you can see that from the photos. Thanks
GBA Detail Library
由气候和房屋部分组织的一千个建筑细节的集合
答复
布雷特，
只要将爬网空间排出到外部，在爬网空间的膝盖墙中安装绝缘层就不会做得很好。通风就像在冬季打开客厅的窗户一样 - 如果窗户打开，则在墙壁上添加绝缘是没有意义的。
So, you need to close the vents and seal them up airtight. But you also need to perform air sealing on all of the joints in the crawl space - foundation to sill, sill to kneewall, etc.
Most important, you need a vapor barrier on top of the soil, at a minimum. A vapor barrier over a few inches of insulation would be better. The vapor barrier must also be sealed airtight. Seal the seams to each other. Run the vapor barrier up the crawl walls.
最后 - 首先 - 要弄清楚为什么水在大雨中进入爬行。它可能来自外面的土壤表面。如果水池靠在粉底上，它将找到一种方法。确保落水管清晰，并且水远离基础。确保外部的土壤远离基础。如果可能的话，您希望从房子里有10个正斜率。
所有这些网站上都有很多文章，其中大部分都是DIY-Able。没什么好玩的，但肯定是可行的。
嗨,布雷特。
If you are handy and patient, sealing up and insulating your crawlspace may be something you can tackle on your own. To see what is involved, I suggest you read this:建造一个未通风的爬网空间.
A heavy polyethylene or EPDM vapor barrier on the crawlspace floor sealed to the foundation walls would allow you to safely close the vents to the outdoors.
使用回收的屋顶泡沫来隔离地基墙，每R比巴特绝缘材料便宜。
西北太平洋地区覆盖了许多领土和三个IECC气候区。有邮政编码？
谢谢大家的答复。达纳-94523（北加州）听起来很少，我需要一个蒸气屏障 - 如果我diy，就可以从购买地点购买的任何建议吗？
I guess the worry I had with closing off the venting and adding a vapor barrier was that I was going to need a sump pump (maybe I do?). Is it safe to add a vapor barrier and close off the vents considering we have plumbing under the house??
Brian - thanks for that link. I've read that article a few times and always enjoy the refresher.
彼得 - 当您说“几英寸绝缘的蒸气屏障会更好”时，您是什么意思。”再次感谢您的评论
Here are some of the links beyond the articles here I've collected while researching closing my own crawlspace in the southeast. Disclaimer: I have no affiliation or direct experience with these vendors or their products.
设计和一般信息：
https://www.energystar.gov/campaign/seal_insulate/basement_crawlspace
https://www.advancedenergy.org/crawlspaces/
Vapor barriers & materials:
https://www.layersplastic.com/product/silverback-hs-12mil-vapor-barrier/我在朋友的封闭爬网中看到了这个或非常相似。这是艰难的东西。
https://crawlspacerepair.com/
http://www.crawlspacedepot.com/
I'll note that in examining my friend's crawl, the tape was coming loose in spots. I think, as with taping in general, the devil is in the application. Going over the tape with a roller, which strikes me as difficult over the rough surface of a crawl, is important to getting tape to adhere well. Mastic with fiberglass mesh tape would likely work better. Not much adheres to polyethylene well.
重新泵泵：如果您可以从爬网的最低点排出白天，那么更好。记住要阻止啮齿动物。
Re vapor barrier with plumbing: You'll install a drain through the low point of the vapor barrier.
布雷特，
I was suggesting installing some foam insulation on the floor under the vapor barrier. Even in your relatively moderate climate, the soil will be naturally cooler than room temperature. This increases the risk of condensation on the vapor barrier if outdoor air still finds its way into the crawl. By insulating the floor, the surface temperature of the vapor barrier will equalize to nearly room temperature. This saves some heating energy and decreases condensation risk.
If there is any chance that the crawl will flood, this won't work because insulation floats.