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Question DetailsAsked on 12/22/2019

How to fix gap between sill plate and top of the foundation wall.

I have a one story, 76 year old house with a full basement. We had the original basement windows replaced with glass block windows about 8 years ago. I noticed today that there is about a half inch gap between the sill plate and the foundation wall where the windows were installed. I want to add foam insulation in the basement, but don't know if this is something that needs to be fixed first. The floor joists are all fine, it is just the sill plates that seem to have been pushed upward during the window installation. All the doors and windows are operating as they should and I don't see any other signs of the foundation shifting. If the sill plate gap isn't something to be seriously concerned about, I planned to try and put some type of moisture barrier on the foundation wall and then use foam insulation to seal up the crack. I don't know who would do this kind of repair if we don't or the expense.

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