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foundation never sealed?

Our house was built approx 1957 - we dont think they could have
sealed the block foundation due to the amount of the chalky substance that leaches thru block - we put downspouts into
undergounds pipes to get runoff as far away from house as
possible (approx 25' downhill)and we still have a problem -
what could possibley be done now and what about deterioration
of the block? one wall now has a problem with some mold. We had a large tree in front yard cut down a few years ago that was close to house - could the rotting roots now be a channel for
any moisture in ground to get next to foundation? We
use a dehumidifier in the spring thru fall until the ground
freezes. location: northeast

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