Dampness around the floor of an insulated basement wall
我在中西部的5区，冬天下雪，在夏天潮湿。
在地下室，我将7英寸的刚性泡沫连接到混凝土砌块的墙壁上，并在泡沫之后将两英寸的矿物质羊毛附着。第一层的泡沫直接连接到墙上，然后用毛茸茸的条附着每一层。我还确保毛茸茸的条在地板上方几英寸处停了下来。
There had been an interior french drain, which I removed, both to be able to insulate to the bottom of the wall and to be able to mitigate radon. I regraded the yard which has stopped most water intrusion, which was already minor. However, in heavy rain (2+ inches per day) some water does occur around the wall. I hope to do more to stop this.
我的问题是，我想确认我的理解，隔热层下的潮湿是可以的。我认为还可以的原因是因为有几篇文章。我想知道霉菌不会在刚性泡沫上生长，而是在混凝土块上生长。
Attached is a photo. I tore back some of the insulation, to confirm there is dampness. I could remove the insulation in the area a few inches above the floor, allowing the floor to dry entirely.
//m.etiketa4.com/blogs/dept/musings/how-insulate-basement-wall
[Comment # 15 Concrete is a wonderful substance, and it holds up well when exposed to water. Remember, the exterior side of most basement walls and basement slabs are constantly damp — and builders haven’t been worrying about what that means for the last 100 years. You drive by concrete bridge abutments every day, and I doubt that you stay up at night worrying about the damp concrete. Nobody is running out with a hairdryer to keep the concrete bridge abutments dry every time it rains.
When a basement wall is covered with rigid foam or closed-cell spray foam, the interior air is no longer contacting the basement wall. It’s a great system. There is no magical hidden condensation going on under the foam, because the interior air isn’t there. The interior air is on the other side of the foam.]
[The wall here has less rigid foam than my wall, and my floor is unfinished.]
https://buildingscience.com/documents/reports/rr-0208-what-you-need-need-to-know-about-mold/view
[General article on mold.]
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Replies
Erich,
水垢条创建一个空气spac吗e between the different layers of insulation? How thick is the initial layer?
Erich,
Q. "I want to confirm my understanding that a bit of dampness under the insulation is okay."
A. Your understanding is correct. You don't want liquid water entry. But your foundation wall can stay damp forever without problems.
Steve - The furring strips and foam are 1.5 inches thick, so no big gaps.
Martin - Thanks. There is no roof overhang which is part of the problem. I think the water comes through the former interior french drain, because of the remaining gravel and tile.
Erich,
In Zone 5 you want R-15 of continuous insulation on the basement wall. If you installed the 1.5 inch initial layer and then used strapping to create an air space, you won't achieve the recommended minimum. Or am I not understanding how your assembly was put together?
Steve - I applied the first sheet of foam directly to the wall. Then several horizontal 2x4s, to secure the foam against the wall. Then I cut foam and inserted between 2x4s. Then I attached vertical 2x2 furring strips. And repeated the process, using 2x2s.
The attached photo shows 3 different layers.
如果交替的层连续，可以通过较少的热桥，较少的泡沫切割和较少的毛茸茸来完成，从而长期螺旋，将毛茸茸通过连续的层到另一侧的毛茸茸。它具有比具有可比材料相当的材料所吸收的更多的热架桥接，但是它仍然比Code-Min R15连续绝缘材料要好得多。
您创建的本质上是一种多层形式的“ Mooney Wall”，其中一层的毛茸茸与相邻层的毛茸茸直接接触。较典型的穆尼墙只有两层，对于高度的应用，纤维绝缘隔热：
https://www.builditsolar.com/Projects/Conservation/MooneyWall/MooneyWall.htm