Will a higher R-value in the wall and sealing compensate for the absence of a slab-edge insulation?
GBA编辑器|Posted inEnergy Efficiency and Durabilityon
We are building a Built Green home in WA state where we have a mixed climate with hot summers/cold winters. The concrete sub did not intall a 2×4 where the slab meets the foundation. The walls are R-28 and the ceiling is R-50. Will the walls and ceiling make up for the lack of insulation at the junction. Energy Star requires an R-5.
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答复
克里斯，
简要答案是没有。你真的不想要像这样的流血能泄漏 - 一个耀眼的热桥 - 为建筑的生活。在理论上，在向您的阁楼添加更多绝缘材料时，在理论上，稍微降低您的能源票据以弥补基础周边的丢失，还有其他问题，包括舒适和潜在的模具形成，即阁楼绝缘将永远不会解决。
但是，一切都没有丢失。仍然可以提出一种阻止您的基础的方法。你写的是，子忘了“板坯遇到基础的地方”。给我们更多细节：
1.这是一个基底板块还是等级的平板？
2.什么类型的基础墙是板坯会议？
我的第一次反应是“绝缘基础的整个外部”。但我不确定你的基础是什么样的。
它是级别的板坯，基础墙壁是混凝土。
As a follow-up to the above does anyone have know of a way to create a thermal break where the foundation wall meets the slab. I am planning on insulating on the outside of the poured concrete foundation wall and under the slab. I am however having a problem in determining how I can achieve a thermal break where the foundation wall joins the footing. If I was insulating inside the foundation wall this would not be much of an issue but I want to insulate on the outside and use the walls thermal mass to moderate diurnal temperature fluctuations.
我已经考虑过iopary通过iCual op在基础板上的ICF块来实现这一目标，然后用钢筋将墙倒入ICF并将其整合在一起。我被告知，“代码”不会批准这一点。
Does anyone have any suggestions?
Don
What we typically do is pour the slab to the wall with a 2x4 between the slab and wall. Then we remove the 2x4 and insert a 1/2" foam board and fill the space with concrete. This create the thermal break and gives it an R-5 value. We are worried about moisture because we are laying bamboo flooring. We sealed the area with a moisture barrier but still worried about laying the bamboo. The bamboo will be glued down.
克里斯，
Your options are:
1.用混凝土锯切割混凝土板，演示混凝土条，清理沟槽，用刚性泡沫或闭孔喷雾泡沫填充沟槽。如果规格需要在此位置的绝缘，并且具体次级没有这样做，那么工作应该以具体的子项目进行。
2.在基础墙的外部安装外部刚性泡沫绝缘;用纤维水泥板，灰泥或金属闪光保护泡沫。一定要小心地闪光在壁板和泡沫保护板之间的连接。此详细信息显示在我们的GBA网站上：
//m.etiketa4.com/cad/detail/monolithic-slab-cold-climate
By the way, there is no 1/2-in. foam board that provides R-5. The most commonly used foam board for foundation insulation is extruded polystyrene (XPS), which has an R-value of R-5 per inch -- so 1/2 in. would provide R-2.5.
The material we use for the 1/2 foam is actually a P-2000 product. You can see it athttp://www.P2000insulation.com。谢谢您的回答。
克里斯，
谨防;由于其夸大的R价索赔，P2000绝缘保温的营销人员对于当局运行而臭名昭着。P2000绝缘具有约R-3.8每英寸的R值，因此P2000的R-inve的R值约为R-2或更低。
要了解有关P2000的更多信息，请参阅
//m.etiketa4.com/blogs/dept/musings/beware-r-value-crooks。
谢谢你。很高兴知道。
Martin,
While I agree with you about R-value scams, to be fair to R2000 it must be noted that they are claiming R-10.2 for an assembly not the insulation itself.
包括3/4“和5-1 / 2”E-0.05空间和1“的R-3.87泡沫板，其ASTM C1363测试结果不远处。
但是，使用低E材料紧密到混凝土板（如泡沫箔），不提供辐射优势。
罗伯特，
不幸的是，您对P2000营销索赔准确性的信念被放错了。已经有许多文件的P2000营销人员声称其产品的R价，实际上是一个组装R值，而不是产品R值 - 声称如此不清楚（和非法），购买者像KRIS这样的购买者认为该产品夹在板坯和混凝土墙之间，箔增加了R值。我的报告中提供了误导声索赔的一个例子（用于插图的表）。
We do use P2000 as a thermal break on the house but do not claim any R value. The P2000 salesman provided us with documantation "verifying" it's R-value. However we do not think there is enough there to matter.
One of the big issues with the P-2000 is the fact that it is a radiant product. It may work just lovely in walls or ceiling where there is an air gap across which the radiant properties of the material can work, but if it is buried in/under the concrete, it is not doing any sort of radiating, only conducting. I've seen it in basement slabs and it doesn't insulate well at all.
克里斯汀，抱歉劫持，但不是安装然后拔出2x4，为什么不仅使用1-1 / 2“泡沫作为你的热休息，并在浇注后留在那里？如果你担心顶部显示泡沫的泡沫可以在安装前逐渐逐渐逐渐变细。
Did you install a vapor barrier and/or foam insulation under the slab? That will have an impact on moisture issues as well.
是的，我们确实在板块下安装了蒸汽贫瘠和泡沫保温。我喜欢未来项目的1-1 / 2泡沫。我们将竹子粘在地板上。对此有什么意见？我们在西北部的热门/寒冷的气候下，但不潮湿。
With insulation under the slab, condensation due to the slab being cooler than the air should be minimized. A vapor barrier should mitigate moisture movement up from the earth. Considering how dry eastern WA is, moisture issues are not as large a factor as they would be in western WA or the northeast US anyway--but they are still a factor.
I've never glued a wood or bamboo flooring to a slab, but it sounds like you have taken the proper steps to ensure success. How long did you allow the slab to cure? Did you check the moisture level of the bamboo or the slab?
我必须道歉劫持,但这3个ad seems to be the closest active thread i can find after extensive searching for a solution to my issue. My existing house has a 4" slab with no footings and wood siding. The edge of the slab is completely exposed, in fact small animals have tunneled underneath the slab. I would like to dig down to frost depth and simply simply install rigid foam vertically on the slab edge. My issue that is it wont be easy for me to do the entire perimeter in one shot and i am worried that i might create air pockets between the soil beneath the slab and the interior face of the rigid foam board. I am not worried about the load without footings as the load has not caused the slab to break though the coldest Michigan winters for 40 years. I have been trying to come with the simplest solution and can't. Can anybody help me!?
亲爱的kzoo孩子，
Your proposed insulation retrofit idea is probably doable. However, if you think you lack the skills to complete the work, that's a pretty good sign that it's time to call in an experienced contractor.
Michael, the concrete cured for eight weeks and we had the bamboo sitting in the house for eleven days before we laid it. The outside temperatures were 80's and 90's during that time. We moisture tested the concrete before we laid the floor.