How can we stop water from seeping through the walls of the cold room?

Drylok is a very effective waterproofer for use inside masonry walls. It tested far better than anything else, so don’t be discouraged by your lack of previous success with paint. From what I’ve seen, I expect Drylok will solve your problem. You do need to get back to bare masonry before applying it, though. You’ll also need to put the product on when the concrete isn’t oozing water. Lots of places sell Drylok, though many store clerks don’t know it. Ask them to do a computer search before they dismiss your request.

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