Insulating top half of basement wall
Hi
I am considering insulating only the top half of my basement foundation wall in the unfinished portion of my basement. The bottom half has waste, vent and water pipes attached to it which makes it difficult to insulate. There won’t be any drywall in front of this half insulated wall since this area of the basement is unfinished. questions:
1）将墙壁的上半部分绝缘有助于能源效率吗？大约2英尺的这堵墙高于等级
2）这会导致水分问题吗？
thanks
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
Search and download construction details
Replies
Is your rim joist insulated? I guess I also wonder how far you would get with a super insulated rim joist without the rest of the wall insulated. Would it make a huge difference between having just the rim joist or no insulation at all.
没有我的轮辋托梁在这个领域没有绝缘，因为它与天花板/地板托梁平行并很难访问
What climate zone are you in? It seems likely it'll help with energy efficiency. This sitehttp://www.sensiblehouse.org/nrg_heatloss.htm.has a good discussion of heat transfer, including through soil, and it's has the info you need should you want to estimate heat loss.
我不了解湿度 - 你可能会降低墙壁的温度，从而提高冷凝的可能性。水分不会伤害混凝土墙（是您的墙壁混凝土，CMU或？），但可能会促进模具。也许用不可渗透的泡沫（例如，面部）隔离并密封边缘。我猜测这个网站上的专家会要求您在尝试答案之前向您询问地下室中的相对湿度，湿度控制和任何历史性问题。
Generally the rule is that insulating part of a wall is like waterproofing part of the bottom of a boat.
If you have a wall that is insulated to R2, and you up the insulation on half of the wall to R20, the average combined insulation is R3.6. Which is better than R2, but not close to the R20 you're paying for.
But basements can be tricky, if part of the wall is above ground insulating that part already has different heat loss characteristics.
我会考虑在管道周围和后面隔绝的方法。
基本上有三个“区域”在地下墙中：
1- The part ABOVE grade. This is where you lose the most heat
2-低于等级的部分，但在霜线上。这是下一个大型热量损失区域。
3- The part BELOW the frost line. This area never goes below freezing, and while you still lose heat here, it's less than the other two zones.
You get the most benefit by insulating the parts of the wall that are above the frost line, since those are the parts of the wall that see the largest temperature differentials and thus have the largest heat loss. Since you're going to be insulating all of the part of the wall that is above grade, you'll get a big benefit, especially since you said there are two feet above grade. If you can extend down to the frost line, you'll get a big chunk of the benefits that you'd get by insulating the entire wall.
It's definetely worth insulating the upper four feet of this wall, you'll see a big improvement there. If you can insulate down to at least the frost line everywhere else, that's worth doing too. Insulating the entire wall is obviously optimal, but not required to see improvement in the overall heat loss from the basement wall.
You won't have moisture issues, especially if you have a capillary break between the top of the masonry and the wood sill plate. Leaving part of the wall uninsulated actually allows for more drying potential and less chance of moisture wicking it's way up the wall.
As others have mentioned, make sure to air seal and insulate your rim joist as part of this project. That area will have similar levels of heat loss to the above-grade portion of your basement wall, and probably a lot more air leaks too.
Bill
谢谢所有人
它是否符合热量损失的确切数学问题，我相信有很多变量。这肯定不是最佳的，但如果您获得了最高的R值，则可以在RIM托梁中达到平均深度。您如何做到这一点，以及您的预期R值整体将是什么？尽可能昂贵，如果你以某种方式最终结束，略微超过3的平均值，就像你在整个墙上添加1in的eps。