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Fox Blocks. Legos for concrete guys.
We’ll show they work in the long run but they seem like a good idea for insulating.
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I've been seeing these (or similar) for 20 years or so. I think that's long enough for proof.
I know there are plenty of stories of materials that turn out to be shitty, so I understand the hesitancy, but I think this is likely going to be ok.