How do you fix a moisture problem in a finished basement?
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How do you fix a moisture problem in a finished basement?
Margo MACFARLANE
Oct. 28, 2019Last updated: Aug. 25, 2020
Eight years after our house was built, we noticed that the MDF baseboards in our finished basement became discoloured and swollen from potential moisture. We removed the dry wall, the vapour barrier and the fibreglass insulation in two large areas along the same back wall. The concrete appeared to be saturated with water. We inspected the foundation outside. The foundation seems to be sealed, although we had to dig down six inches or so, below the level of some garden beds and lawn that surrounds the house.
地基上似乎没有任何明显的裂缝，一些人认为这可能是凝结的问题。我们已经在房间里放了两个脱膜器有一段时间了，没有发现有更多的湿气。混凝土仍然裸露在外。没有发现有水从墙上的两个窗户井或从地板上漏出。由于我们在后墙发现了这个问题，所以在与后墙垂直的墙上(沿着底板)发现了一些潮湿的迹象。一些保温公司建议，我们应该取消玻璃纤维保温，改用喷沫保温，然后再采用隔气墙和干墙。我们不确定如何进行。请建议。
That isn't a big surprise sinceMDF is a heavily processed wood product very susceptible to moisture damage，所以它可以是一个小的金丝雀在地下室潮湿的损害方面，因为它会比实木和大多数其他加工木材表面材料更快地显示损害。
I suspect that the concrete isn’t actually that well-sealed, and even if your foundation wall has a membrane or bituminous spray, it’s unlikely the footing was sealed, and being porous, the concrete will continue to wick moisture from the ground.
But the biggest problem you have, and that all basements have, is a vapour barrier sealing organic materials in with wet concrete.
至于如何修理你的地下室，你真的需要把所有东西都搬走，重新开始。我们有很多关于如何正确建造地下室的页面(我将在下面链接)，你提出的在地下室墙壁上喷洒泡沫隔热的想法是一个不错的想法。然而，喷雾泡沫本身是一种蒸汽屏障，所以你不需要在泡沫后在墙上应用典型的6密尔聚乙烯蒸汽屏障(尽管在一些地方，建筑检查员可能会要求)。如果你选择在地下室墙壁上喷洒泡沫，目前有两家公司已经改用危害小得多的发泡剂，德米莱克(Demilec)和Elastochem，所以要咨询潜在的安装商，看看他们喷洒的是哪个品牌的泡沫。
The dehumidifiers are a great idea, I would say keep doing that even after you make repairs, or at least keep an eye on the humidity levels and try to keep it below 50 RH. Here are some posts from our Green Building Guide Pages that may help