Why does interior insulation cause a freeze/thaw cycle- cinder block foundation?

P Mci
Updated: July 6, 2021

I have read in many posts that insulating a cinder block foundation wall from the inside in cold climates is risky as it can cause cracking. This is due to the introduction of the freeze/thaw cycle.

I can't wrap my mind around why this wall would not have already been exposed to this cycle, when uninsulated. Can you help me to understand why it would only experience the freeze/thaw cycle once insulated from the inside, and whether there are any improvements to the process of interior spray foam insulation (crawl space) that would help? Our contractor is suggesting that a portion of the wall (at the bottom) be left uninsulated so that the water can go through this portion.

Thank you!

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