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My home is 14 years old. I have been using a 40 pint dehumidifier at 50% until this spring. It was only after discovering mild amount of mold under my fiberglass insulation that I felt I needed to improve upon what I had.

My basement is almost 3000 sq. ft. I had purchased 2 70pt. dehumidifiers, placing them on opposite areas of the basement. (as I found the humidity was different in one area than the other).

The humidity now is between 40 - 45% where it was at 67% with first utilizing the new humidifiers.

I have noticed cracks that were not present in my walls and floors before, beginning at a 55% humidity level in the basement. I have a neighbor who uses 2 70 pt. units in a smaller basement at a lower humidity level with no complaints, so I was surprised by this change.

It has been 4 months later and the cracks have stabilized.

Any thoughts on why this would occur?

Suzanne
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Thank you.

I have been following up on the cracks, they have stabilized. I had a basement structural engineer review them along with the integrity of the walls and floor, no structural problems. I used a joint/crack concrete sealant laying down a backer rod first which has remained unchanged.

May have pulled moisture too quickly with changing to 2 more efficient dehumidifiers as no cracks were noticed prior to this change.

Using concrete sealant to decrease likelihood of additional drying/crackingof concrete.

Suzanne
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