Why is my cinderblock foundation cracking after I installed insulation and a vapour barrier?
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地下室完工后，如何解决基础墙裂缝的问题?
Terry P
July 22, 2020Last updated: Sept. 25, 2020
我1983年在安大略省中东部建的房子里有一个煤渣块地基。1999年，我完成了地下室的装修，用沥青纸贴着水泥墙，然后是螺柱和四英寸的绝缘层，然后是防潮层和石膏板。两年前，我注意到一些基础砌块的外部有裂缝，那里的内墙是隔热的，但地下室的一部分没有在内部完成。我已经在外墙挖了大约一英尺深，在地面以下的任何基础部分都没有明显的裂缝。
The interior walls are in good condition with no evidence of moisture or mold. I was going to have the foundation walls parged however I am looking for a longterm solution for this and want to make sure that I am addressing the actual underlying problem. Would I have to remove insulation, vapour barrier and drywall on interior basement wall and eventually refinish the interior walls of the basement in a different manner to rectifiy this problem longterm?
Insulating a cinder block (or CMU) foundation wall from the inside in cold climates is risky as it can cause cracking. Acinder block foundation wall is not as strong as poured concrete因为它是用砌块之间的砂浆粘合在一起的。因此，将它与内部绝缘意味着你正在改变已经习惯的热环境，突然间它将受到季节性冻融循环的影响。我猜事情就是这样。
How bad is the cracking? Is it anywhere close to being a structural problem? Before moving ahead with any more work it may be worth having a professional look at it to make sure it is safe. In order to stop the problem from happening again or getting worse, I think you would need to prevent the blocks from freezing again. I don’t imagine you want to remove all you have done to insulate the interior, so is there anyway you can work a bit on the exterior?
If so, I would propose the following – either get an excavator to dig down to below the frost line and install exterior rigid insulation, or, dig down a little bit, ad some insulation to the above grade portions and install a skirt insulation around the perimeter.
The skirt you can cover with dirt, and as for finishing the vertical wall portion, you could install eithermineral wool or foam rigid insulation panels, read more here. On top of that you could apply a cement board that can be parged or left as is. Let me know if any of those options make sense.
在我看来，我认为地基问题的根源在于地下室内部墙壁上的绝缘材料和蒸汽屏障的使用。如果墙壁被拆除(包括焦油纸、绝缘材料、蒸汽屏障和石膏板)，这是最好的解决方案吗?我准备好了住在没有完工的地下室里。如果我选择完成墙壁，我可以只在螺柱上用石膏板重新完成(没有绝缘或蒸汽屏障)，并且这样可以调节砌块墙的温度吗?我会找个工程师去看看地基。
"To me I see the source of the problem with the foundation due to the use of the insulation and vapour barrier on the inside basement walls."
Agreed. The blocks are freezing in winter now when the didn't before, and you probably aren't noticing it below grade because its staying warmer.