Sealing hole in block foundation
Dima12
| Posted in General Questions on
Since buying the house, I always wondered what this 4 foot cutout is in the foundation wall. Seems like there is a double layer. I get all kinds of rodents and bugs living up there. I have attached a photo.
Thank you
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Replies
Based on what I see, it looks like the cutout might have been part of a former vent or access point, possibly for drainage or utilities. The double layer could be a sign that the foundation was reinforced or modified at some point. The gap under the foundation is definitely a place where rodents and bugs can get in.
To seal this off, I recommend filling the gap with a strong material like concrete or foam insulation. You can also install a vent cover if it's an old vent, or mesh to keep pests from entering. Just make sure to inspect the area for any other gaps and seal those too. If you’re unsure about the cause of the cutout, a foundation professional could take a closer look to confirm if it’s safe to seal it or if it requires further work.
The cutout may have been part of a previous system, but it’s definitely a concern with pests getting in. I agree with the suggestion of filling the gap with concrete or foam insulation to block entry points. I’d also recommend adding some kind of mesh or solid cover to prevent rodents and insects from getting through. If the foundation has been modified, it’s best to make sure there’s no water damage or structural issues behind the cutout. If you're unsure about the materials or sealing process, getting a professional opinion might help avoid any long-term issues. For more help: https://www.concretesrichmondva.com/
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