SESK: Stuff Everyone Should Know · sesk.info/home-a-bsmt-sump
Why should a sump pit have an airtight cover?
An open pit draws in moist basement air through the foundation.
- An open pit draws in moist air ✔
- It keeps the pump from rusting
- It stops the pump making noise
Why: In most houses warm air rises, pulling moist air in through any cracks or openings in the foundation, including open sump pits. UMN Extension says sumps should have an airtight cover.
Huh, didn't know that: UMN says a sub-slab depressurization system also helps control radon and other soil gases.
What gets bigger and bigger as you take more away from it? A hole!
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References
Answer: An open pit draws in moist air. In most houses warm air rises, pulling moist air in through any cracks or openings in the foundation, including open sump pits. UMN Extension says sumps should have an airtight cover.
- UMN Extension: Moisture in basements, causes and solutions extension.umn.edu/garden-and-home/home-maintenance/caring-for-a-home/moisture-in-basements-causes-and-solutions
sumps should have an airtight cover
Checked 2026-10-10.
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