代码在隔离我的平板时没有建议
几个月前,我询问了在MN中使用Hydronic加热的车库平板材料的最佳方法(第6区):
Consensus was to place 6 mil polyethylene vapor barrier ABOVE XPS insulation, directly beneath concrete slab. PEX tubing would then be stapled to XPS foam boards, and rebar on top of PEX.
但是,建筑物检查员使我的安装失败,说明代码需要4英寸的岩石来缓解ra,然后进行聚乙烯板,然后是泡沫板,最后是PEX和Rebar进行倒入。
所以,我的问题是:我应该在乎吗?我知道约瑟夫·拉斯蒂布尔克(Joseph Lstiburek)在说什么……在薄板和混凝土之间没有沙子,也没有泡沫板下方的poly。但是,有什么风险?(I know what the risk is if I don’t do it like the building inspector asks!!) Most builders here in MN routinely put the poly on top of the rock, then put down the foam board insulation, and not simply because of code, I’m told.
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
答复
肯特,打印出BSC的详细信息,并在向他展示PDF时购买您的检查员午餐。
下面的塑料泡沫并不可怕。如果您只需使用一个开关就可以做到,那么您不会在砾石中捕获水。泡沫将没有大量水流入的空间。不是最好的,但是...也许您也可以找到检查员说服您的检查员...或勒索或...
最后,我希望您的计划不接受您的实际安装经文,而是被拒绝了。在这里,我们的计划在我们建造之前得到批准。
肯特,
如果你幸运的话,你在th干燥的天气e hours between when the polyethylene is installed and the concrete is placed, you'll probably be OK. The worst problems occur when it rains after the rigid foam is installed but before the concrete is placed. At that point you have wet foam, and you have water under the foam and between the foam sheets. That water takes a long time to dry out, delaying the installation of the finish flooring.
It's too bad that building inspectors don't know more about building science. One tactic is to politely ask your local building inspector to cite the code that requires the poly to be under the foam. I don't think such code language exists.
谢谢,先生们。检查员引用了指定“蒸气屏障,例如聚乙烯板,必须放在地球上或压实的填充材料上,在混凝土板下方……”因此地球”或“污垢”。
在下周二混凝土倒入之前,只有30%的降雨机会,所以我想我会按照他的规则玩游戏,而不是屈服。只要没有明确的风险,即损害泡沫绝缘,缓解ra或整体结构的完整性,我认为我会选择更关键的设计元素来与他一起撞到屁股!谢谢!
阅读并查看最后一个细节,图#21 -slab绝缘材料,在明尼阿波利斯的一项研究的最后一页上,由建筑科学公司完成:http://www.buildingscience.com/documents/profiles/etw-minneapolis-profile
您可以打印并将其带给您的建筑物检查员。